What to Expect During Furnace Installation: A Step-by-Step Guide


Knowing what to expect is crucial. This blog post provides an overview of the furnace installation process, emphasizing the importance of professional installation by a modern HVAC contractor and highlighting the benefits of a new furnace. HVAC technicians and installers play a crucial role in ensuring a successful furnace installation.

Preparation is key before the installation can start. A professional HVAC contractor team will assess your home’s heating needs and determine the appropriate size and type of furnace for your space. Whether you need a new HVAC system or just a repair, an experienced HVAC technician can help you find the right solution. Trust in the expertise of a modern HVAC contractor to keep your home comfortable all year round. Once the furnace installer has ensured that everything is in place, the installation process begins with careful consideration of safety measures and proper placement of the new HVAC system. This includes proper wiring of the unit and ensuring that all appliances are connected correctly.

During the commissioning of the furnace installation, the furnace installer takes various steps to ensure that the wiring and new equipment work seamlessly. On installation day, our commissioning and installation technicians will handle the new furnace installation. This includes connecting power sources, following manufacturer guidelines, and testing system operation. By hiring a professional team for the commissioning of your new furnace installation and new HVAC system, you can have peace of mind knowing that every step is carried out efficiently and effectively.

Before Furnace Installation

Scheduling an appointment with HVAC company

To ensure a smooth and professional commissioning of your new system, the first step is to schedule an appointment with a reputable HVAC team. Give the team a call or reach out through their website to set up a time for the coil installation. It’s important to choose a company that specializes in furnace and coil installation and has experienced professionals who can handle the job efficiently.

Clearing the installation area of obstacles

Before the furnace installer arrives, it’s crucial to clear the area where the new furnace coil will be installed. Remove any furniture, boxes, or other items that might obstruct access to the coil or pose a safety hazard during the installation process. Creating a clear and open space will make it easier for the professional furnace installation to work and ensure that everything goes smoothly.

Disconnecting power and gas supply

As part of the preparation for furnace installation, it’s essential to disconnect the power and gas supply to your old furnace.

The Installation Process

Arrival of HVAC Technicians and Equipment

Once you’ve scheduled your furnace installation, the day will finally arrive when the installation team shows up at your doorstep. You can expect a crew of professional furnace installation skilled installers, equipped with all the necessary tools and materials to get the job done right. They’ll bring in their gear, including the new furnace unit, ductwork components, and any other equipment needed for a successful installation.

Assessment of Existing System and Ductwork

Before diving into the installation process, the technicians will carefully assess your existing heating system and ductwork. This step is crucial as it allows them to evaluate if any modifications or repairs are required before installing the new furnace. They’ll inspect the condition of your current system for professional furnace installation, checking for any issues that may affect its performance or compatibility with the new unit.

Determining Optimal Furnace Location

Finding an optimal location for your new furnace is another key aspect of the installation process.

Day of the Installation

Preparation for installation, including protective measures

On the day of the furnace installation, the first step is to make sure everything is prepared and ready to go. The installation team will take precautions to protect your home from any potential damage during the process. They may lay down protective mats or coverings on the floors and furniture to prevent any scratches or debris from getting on them.

Removal of old furnace and components if necessary

If you are replacing an existing furnace, the installation team will remove it before installing the new one. This involves disconnecting all the necessary components and carefully taking out the old unit. They will ensure proper disposal of the old furnace according to local regulations.

Organizing tools and materials for installation

Once the preparation is complete, the installation team will organize their tools and materials for a smooth and efficient process.

Safety Checks

During a furnace installation, there are several safety checks that need to be conducted to ensure a safe and secure process. These safety checks are crucial in order to prevent any potential hazards or accidents. Let’s take a closer look at what you can expect during these safety checks.

Proper Ventilation

One of the first safety checks that will be performed is ensuring proper ventilation in the installation area. This is important because furnaces produce carbon monoxide, which can be harmful if not properly ventilated. The technician will assess the existing ventilation system and make any necessary alterations or improvements to ensure that the furnace operates safely.

Gas Leaks and Electrical Hazards

Another critical safety check involves inspecting for gas leaks or electrical hazards. The technician will carefully examine all gas connections, valves, and lines to ensure they are secure and leak-free. They will also check the electrical components of the furnace, including wiring and connections, to identify any potential hazards or issues.

Reconnecting and Sealing

During a furnace installation, one important step is reconnecting the new furnace to the existing ductwork. This ensures that the heated air can flow through your home efficiently. The ductwork acts as a pathway for distributing warm air from the furnace to different rooms.

To ensure proper airflow, it’s crucial to seal the joints between the ducts securely. This prevents any air leakage, which could result in energy loss and reduced heating efficiency. By sealing these joints, you can maximize the effectiveness of your new furnace and keep your home comfortably warm.

Once the connections are made and sealed, testing is done to ensure everything is working properly. This involves checking for any blockages or restrictions in the ductwork that may hinder airflow. The technician will also verify that all connections are secure and that there are no leaks or gaps in the system.

Venting is another aspect of furnace installation that needs attention.

Commissioning HVAC Equipment – The Forgotten Step

Tuning the Newly Installed Furnace for Optimal Performance

Once your new furnace is installed, it’s essential to tune it for optimal performance. This involves adjusting various settings and parameters to ensure that the furnace operates efficiently and effectively. A professional technician will carefully calibrate the system to match its specifications and maximize its energy efficiency.

During the tuning process, the technician will assess factors such as airflow, gas pressure, and temperature differentials. They will make adjustments to these parameters as needed to achieve optimal performance. By fine-tuning the furnace, you can ensure that it operates at its highest efficiency level, saving you money on energy bills in the long run.

Calibrating Thermostat Settings to Match New System Specifications

To get the most out of your newly installed furnace, it’s crucial to calibrate your thermostat settings accordingly.

Cleanup and Review

After the installation of your furnace is complete, you can expect the HVAC technicians to thoroughly clean the work area. They understand the importance of leaving your home just as tidy as they found it. So, you won’t have to worry about picking up after them!

Once everything is cleaned up, it’s time for a review. Take this opportunity to discuss any concerns or questions you may have with the HVAC technicians. They are there to ensure that you feel confident and comfortable with your new furnace.

During this review, make sure to ask about proper maintenance for your furnace. Regular maintenance is crucial for keeping your system running smoothly and efficiently. The technicians can provide guidance on how often to change the filter and what other maintenance tasks should be performed.

Don’t forget to schedule follow-up maintenance appointments! These appointments are essential for keeping your furnace in top shape and preventing any potential issues down the line.

After Your Furnace Installation

Properly Maintaining Your New Furnace System

Now that your new furnace system is installed and ready to keep you warm, it’s essential to understand the importance of proper maintenance. Regular maintenance ensures that your furnace operates efficiently and extends its lifespan. Remember to replace or clean the air filters regularly, as clogged filters can restrict airflow and reduce efficiency. Schedule annual professional inspections to identify any potential issues before they become major problems.

Familiarizing Yourself with Warranty Information

After the installation, take some time to familiarize yourself with the warranty information provided by the manufacturer. The warranty typically covers specific parts or repairs for a certain period. Understanding the terms and conditions of your warranty will help you determine what is covered and what isn’t. Keep a copy of the warranty in a safe place for easy reference if needed in the future.

The Importance of a Good Installation

Impact on Efficiency

A proper furnace installation plays a crucial role in ensuring optimal efficiency. When your furnace is installed correctly, it operates at its highest efficiency level, which means it can effectively heat your home while using less energy. This not only helps to reduce your carbon footprint but also saves you money on energy bills in the long run.

Potential Problems Caused by Improper Installations

On the other hand, an improper furnace installation can lead to a host of problems. One common issue is inadequate airflow, which can result in uneven heating throughout your home. This means that some rooms may feel warmer than others, leaving you uncomfortable and dissatisfied with the performance of your furnace.

Another problem that can arise from a poor installation is frequent breakdowns and repairs. When components are not properly connected or calibrated during the installation process, they are more likely to malfunction or wear out prematurely. This can result in costly repairs and inconvenience for homeowners.

What Size Should Your New Furnace Be?

To ensure optimal performance and energy efficiency, it’s crucial to choose the right size for your new furnace. Several factors come into play when determining the appropriate sizing considerations.

Factors Influencing Appropriate Sizing Considerations

The size of your new furnace depends on various factors such as the square footage of your home, insulation levels, local climate conditions, and even the number of windows and doors. These factors affect the amount of heat needed to keep your home comfortable.

The Importance of Accurate Load Calculations

Accurate load calculations are essential in determining the correct size for your new furnace. Load calculations take into account factors like the climate zone you live in, the insulation in your home, and its overall energy efficiency. By conducting these calculations, HVAC professionals can determine how much heating capacity is required to adequately warm your living space.

Other Preliminaries to Furnace Installation

Before diving into the furnace installation process, there are a few other important things to consider. Ensuring proper permits and approvals are obtained is crucial to avoid any legal issues down the line. It’s essential to review local building codes and regulations to ensure compliance with safety standards.

Scheduling any necessary inspections is another crucial step in the process. This helps ensure that everything is in order before proceeding with the installation. Inspections may include checking the electrical connections, gas lines, and ventilation systems.

Obtaining permits and adhering to local regulations is vital because it ensures that the furnace installation meets all safety requirements. Failure to obtain necessary permits or comply with regulations can result in fines or even having to redo parts of the installation.

Reviewing local building codes and regulations also helps you understand any specific requirements for your area. For example, some regions may have specific guidelines regarding the placement of furnaces or venting systems.

Out With the Old

Removing old furnace components safely

During a furnace installation, one of the first steps is to remove the old furnace components safely. This includes disconnecting and uninstalling the existing unit from its current location. The removal process should be done carefully to avoid any damage to the surrounding areas or other equipment in your home. It’s essential to turn off all power sources and follow proper safety protocols while handling electrical connections.

Proper disposal or recycling of replaced equipment

Once the old furnace components have been removed, it’s crucial to ensure their proper disposal or recycling. Disposing of these items responsibly helps protect the environment and prevents potential hazards. Many HVAC companies offer services for disposing of old equipment, ensuring that it is recycled or disposed of according to local regulations. By choosing a reputable company, you can have peace of mind knowing that your old furnace will be handled in an environmentally-friendly manner.

Testing the Installed Heater

After the new furnace has been installed, it’s important to conduct performance tests to ensure that everything is working properly. These tests help verify that the heating system meets your home’s specific heating needs and operates efficiently.

Conducting Performance Tests on the New Furnace

One of the essential steps in testing a newly installed furnace is checking its thermostat functionality. The thermostat acts as the control center for your heating system, allowing you to adjust and maintain the desired temperature. During this test, a technician will assess whether the thermostat accurately responds to changes in temperature settings.

To evaluate the overall performance of the furnace, technicians may also measure temperature differentials across various rooms in your home. This involves comparing temperatures between rooms with the heat on and off to ensure consistent warmth throughout. If there are significant variations in temperature, adjustments can be made to improve heat distribution.

Finally… Cleaning Up

Thoroughly Cleaning the Installation Area

Once the testing of your newly installed furnace is complete, it’s time to focus on cleaning up the installation area. The technicians will take great care in ensuring that any debris or dirt resulting from the installation process is thoroughly cleaned. They will tidy up the surrounding area, removing any tools or equipment used during the installation.

Disposing of Packaging Materials Properly

During a furnace installation, there are bound to be packaging materials such as boxes, plastic wraps, and foam inserts. It’s important to dispose of these materials properly and responsibly. The technicians will make sure to gather all the packaging materials and dispose of them in an appropriate manner. This not only keeps your home clean but also contributes to environmental sustainability.

Leaving the Premises in a Tidy Condition

After completing the furnace installation and cleaning up, the technicians will ensure that they leave your premises in a tidy condition.

Inspection and Evaluation of Installation Site

Before diving into the furnace installation process, it’s crucial to conduct a thorough inspection and evaluation of the installation site. This step ensures that everything is in order and sets the stage for a successful installation.

Evaluating installation site for potential improvements

During the inspection, HVAC professionals will carefully assess the installation site to identify any potential improvements that can enhance the efficiency and effectiveness of your new furnace. They will consider factors such as airflow, ventilation, and insulation to determine if any modifications or adjustments are necessary.

For example, they may recommend sealing any air leaks or adding insulation to improve energy efficiency. By addressing these issues during the installation process, you can optimize your furnace’s performance and reduce energy consumption.

Identifying any issues with existing infrastructure

Another important aspect of the inspection is identifying any issues with your existing infrastructure that could impact the furnace installation.

Preparing The Installation Site as the Homeowner

Before the technicians arrive to install your new furnace, there are a few things you can do as a homeowner to prepare the installation site. By taking these steps, you can ensure that the process goes smoothly and efficiently.

Clearing space around furnace location before technicians arrive

One of the first things you should do is clear any clutter or obstacles from the area where your new furnace will be installed. This includes removing any furniture, boxes, or other items that may be in the way. By doing so, you’ll provide easy access for the technicians and prevent any potential accidents or delays during the installation process.

Making sure access to installation area is unobstructed

In addition to clearing space around the furnace location, it’s essential to make sure that there are no obstructions blocking access to the installation area.

Removing Your Existing AC System

Removing Your Existing AC System

One of the first steps is removing your existing air conditioning (AC) system. This process involves safely disconnecting and removing the old unit to make way for the new furnace. It’s essential to coordinate the removal of your AC with the schedule for installing the furnace.

To ensure a smooth transition, HVAC professionals will carefully disconnect all electrical connections and remove any refrigerant from the AC system. They will take precautions to prevent any leaks or damage during this process. Once disconnected, they will safely remove the old unit from your home.

During this step, it’s crucial to seal the refrigerant lines properly. This prevents any leakage that could harm the environment or impact the performance of your new furnace. HVAC technicians use specialized tools and materials to seal off these lines securely.

Preparing the Area for the New HVAC System

Before your shiny new HVAC system arrives, there are a few important steps you need to take to ensure a smooth furnace installation process. Let’s dive into what you can expect.

Cleaning and Organizing Installation Area

First things first, you’ll want to make sure the installation area is clean and organized. Clear any clutter or debris from around where the new HVAC system will be installed. This includes removing any furniture, boxes, or other items that may be in the way.

A clean and tidy space not only makes it easier for the HVAC technicians to work efficiently but also ensures that there are no obstructions or safety hazards during the installation process. So roll up your sleeves and give the area a good sweep!

Removing The Indoor Evaporator Coil

During a furnace installation, one important step is the removal of the indoor evaporator coil. This component plays a crucial role in the cooling process by absorbing heat from the air and transferring it to the refrigerant. Here’s what you can expect during this part of the installation process.

Dismantling and removing old indoor evaporator coil

The first step in removing the indoor evaporator coil is dismantling it from its current position. HVAC technicians will carefully disconnect any electrical connections and refrigerant lines connected to the coil. They will also remove any mounting brackets or screws holding it in place.

Taking care not to damage surrounding components during removal

While removing the indoor evaporator coil, technicians take great care not to damage any surrounding components. This includes delicate parts such as fins, tubes, or other sensitive elements that may be present nearby.

Removing the Copper Line Set

Removing the Copper Line Set

One important step is removing the copper line set. This refers to uninstalling the copper refrigerant lines from the previous system. These lines are responsible for carrying the refrigerant between the indoor and outdoor units of your HVAC system.

Properly disposing of the removed copper lines is essential. The old copper lines should be recycled or disposed of in an environmentally friendly manner. Copper is a valuable material that can be reused, so recycling it helps reduce waste and conserve resources.

During furnace installation, it’s also crucial to assess the condition of the copper lines for potential replacement. Over time, these lines can develop leaks or become damaged, which can impact the efficiency and performance of your HVAC system. A professional technician will inspect the copper lines to determine if they need to be replaced or repaired.

Installing New Equipment

Securing New Furnace in Designated Location

Once the old furnace has been removed, it’s time to bring in the new equipment. The technician will carefully secure the new furnace in its designated location. This involves placing it on a stable surface and ensuring that it is properly supported. It’s important for the furnace to be positioned correctly to ensure optimal performance and safety.

Connecting New Equipment to Existing Ductwork

After securing the new furnace, the technician will proceed to connect it to the existing ductwork. This involves attaching the supply and return air ducts to the appropriate openings on the furnace. The technician will use specialized tools and materials, such as metal screws or clamps, to create a tight seal between the furnace and ductwork. This ensures that air flows efficiently throughout your home.

New Indoor Evaporator Coil

During furnace installation, one important component that is often replaced or installed is the indoor evaporator coil. This crucial part of the HVAC system plays a vital role in cooling and dehumidifying the air inside your home. Let’s take a closer look at what to expect during the installation of a new indoor evaporator coil.

Installing New Indoor Evaporator Coil in Designated Location

The first step in installing a new indoor evaporator coil is to carefully position it in the designated location within the furnace unit. This involves removing the old coil, if necessary, and ensuring that the new one fits properly and securely. The technician will take great care to align it correctly to ensure optimal performance.

Sealing Connections to Prevent Refrigerant Leaks

To ensure efficient operation and prevent refrigerant leaks, it is essential to seal all connections between the indoor evaporator coil and other components of the HVAC system.

New Copper Line Set

New Copper Line Set

During a furnace installation, one of the key components that will be installed is a new copper line set. This set consists of copper refrigerant lines that connect the outdoor unit (condenser) and the indoor unit (evaporator coil). These lines play a crucial role in facilitating the flow of refrigerant between the two units, ensuring optimal heating and cooling performance.

To securely connect the copper lines, professionals use a technique called brazing or soldering. This involves melting a filler material, such as silver solder or brazing rod, to create strong and leak-free connections. By using this method, technicians ensure that the line set is properly sealed and can withstand the pressure associated with refrigerant circulation.

Once the connections are made, it’s essential to test the integrity of the line set. Vacuuming and pressure testing are performed to ensure there are no leaks or defects in the system.

Setting the New Air Conditioning Unit

During a furnace installation, one of the crucial steps is setting up the new air conditioning unit. This involves properly positioning the outdoor unit on a stable surface to ensure optimal performance and longevity.

Properly Positioning Outdoor Unit on a Stable Surface

To begin, it’s important to find an appropriate location for the outdoor unit. This area should be flat and stable, such as a concrete pad or level ground. Placing the unit on an unstable surface can lead to vibrations and potential damage over time.

Leveling and Securing the Unit to Prevent Vibrations

Once you have identified the ideal spot, it’s essential to level and secure the unit properly. This step helps prevent vibrations that can impact both its performance and durability. Using a leveling tool, ensure that all sides of the unit are balanced. This will help distribute weight evenly and minimize any potential strain on specific components.

Installing Electrical Upgrades

To ensure a smooth and efficient furnace installation, it’s important to consider the electrical upgrades that may be required. Upgrading the electrical panel is often necessary to meet the power demands of a new heating system. This involves replacing an older panel with one that can handle higher voltage and current requirements.

Running dedicated circuits for both the furnace and AC units is another crucial step in the installation process. By having separate circuits for these appliances, you can prevent overloading and minimize the risk of tripped circuit breakers or blown fuses. Dedicated circuits ensure that each unit receives sufficient power without interference from other electrical devices in your home.

During a furnace installation, it may be necessary to coordinate with an electrician. They will have expertise in handling electrical wiring and connections, ensuring everything is installed safely and up to code. An electrician can also assess if any additional upgrades or modifications are needed based on your specific electrical setup.

New Condensate Drain Line

New Condensate Drain Line

During a furnace installation, one important component that will be installed is the condensate drain line. This drain line is responsible for removing water that is produced by the furnace’s cooling process. It ensures that excess moisture does not accumulate and cause damage to the system.

The installation process involves connecting the indoor unit of the furnace to an appropriate drainage point. The drain line needs to be properly sloped to ensure efficient water removal. This slope allows gravity to assist in carrying the water away from the unit.

Local codes often require the incorporation of a trap or vent in the condensate drain line. A trap helps prevent any unwanted gases or odors from entering your home through the drain line. It also acts as a barrier, preventing pests from entering through this pathway.

In addition to installing the condensate drain line, other important components are also addressed during furnace installation.

Startup Commissioning Process

After the installation of a new furnace, there are several important steps that technicians undertake to ensure everything is running smoothly. This process, known as the startup commissioning process, involves turning on the power supply to the newly installed system, calibrating thermostat settings for optimal comfort, and conducting initial tests of heating and cooling functions.

Turning on Power Supply to Newly Installed System

Once the furnace installation is complete, one of the first tasks in the startup commissioning process is turning on the power supply to the newly installed system. Technicians carefully connect all electrical components and make sure everything is properly wired. They then activate the power source, allowing electricity to flow through the system.

Calibrating Thermostat Settings for Optimal Comfort

To ensure that your furnace operates at its best performance and provides you with optimal comfort, technicians calibrate thermostat settings during the startup commissioning process.

Follow-Up Inspection

Scheduling a follow-up inspection with HVAC company

After your furnace installation is complete, it’s important to schedule a follow-up inspection with the HVAC company. This step ensures that everything is working as it should and allows any potential issues to be addressed promptly. The HVAC technician will visit your home to evaluate the performance of your new furnace and make sure it meets safety standards.

Evaluating system performance after initial use

Once your furnace has been installed, you’ll want to evaluate its performance after using it for a while. This will give you an idea of how well the system is functioning and if any adjustments or fine-tuning are necessary. Pay attention to factors such as temperature consistency, airflow, and energy efficiency. If you notice any irregularities or concerns, it’s essential to contact your HVAC company for further evaluation.

Regular Furnace Maintenance is Key

Importance of regular maintenance for optimal performance

Regular furnace maintenance is crucial to ensure that your heating system operates at its best. Just like any other machine, furnaces require proper care and attention to function efficiently. By performing regular maintenance, you can prevent potential issues, extend the lifespan of your furnace, and maintain a comfortable indoor environment.

Outlining recommended maintenance tasks, such as filter replacement

One important aspect of furnace maintenance is replacing the air filters regularly. Over time, these filters can become clogged with dust, dirt, and other particles, which restricts airflow and reduces the efficiency of your furnace. By replacing the filters every few months or as recommended by the manufacturer, you can improve indoor air quality and allow your furnace to operate optimally.

In addition to filter replacement, it’s also essential to keep an eye on other components of your furnace.

Should I Handle the Furnace Installation Process Myself?

Highlighting risks associated with DIY furnace installation

Taking on a furnace installation project yourself might seem like a cost-effective solution, but it can come with its fair share of risks. One of the main concerns is the potential for personal injury. Furnaces involve electrical and gas components that require specialized knowledge to handle safely. Without proper training and experience, you could put yourself at risk of electric shocks, gas leaks, or even fires.

Another risk associated with DIY furnace installation is the possibility of damaging your new equipment or existing infrastructure. Improper installation can lead to leaks, inefficient operation, or even complete breakdowns. This not only compromises the performance of your furnace but also puts a dent in your wallet as you may need to spend more on repairs or replacements in the long run.


In conclusion, the process of furnace installation involves several important steps that homeowners should be aware of. From preparing the installation site to removing the old equipment and installing the new components, each stage plays a crucial role in ensuring a successful and efficient heating system. Safety checks, commissioning, and regular maintenance are essential for optimal performance and longevity.

To guarantee a smooth furnace installation, it is recommended to consult with HVAC professionals who have the expertise and experience to handle the process effectively. They can provide guidance on selecting the right size furnace, ensure proper installation and safety measures, and offer valuable maintenance tips. By entrusting this task to professionals, homeowners can enjoy a reliable and energy-efficient heating system for years to come.


What is the average duration of a furnace installation?

The average duration of a furnace installation typically ranges from 4 to 8 hours, depending on various factors such as the complexity of the system, accessibility, and any additional modifications required.

How much does a furnace installation cost?

The cost of a furnace installation can vary based on factors like the size and type of furnace, additional components needed, and regional labor rates. On average, homeowners can expect to spend between $2,500 and $7,500 for a complete furnace installation.

Do I need to prepare anything before the furnace installation?

Before the furnace installation, it’s important to clear the area around your existing furnace or designated installation space. Remove any items that may obstruct access or hinder the technicians’ work. Ensure that there is sufficient space for ventilation and future maintenance needs.

Will my home be without heat during the installation process?


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