Efficiency Heating & Cooling

Efficiency Heating and Cooling Company

Why is my AC running but not cooling?


Why Is My Air Conditioner Running But Not Cooling?

For those looking for solutions to AC running but not cooling, or AC not cooling enough; this guide provides answers as to why the air conditioner may be blowing hot air instead of cold. Understanding the underlying causes can help diagnose what is wrong with your unit and ultimately enable you to decide if it needs repairing or replacing.

Thermostat issues

Thermostat issues can be a major problem for air-conditioning units. If the AC is running but not cooling or not cooling enough, it could be due to an issue with the thermostat. Other common signs of thermostat problems include AC blowing hot air instead of cold and/or the AC not blowing any cold air at all.

When diagnosing potential thermostat issues, it’s important to understand how they work in order to identify what might be wrong. Most modern HVAC systems have electronic control boards that regulate temperature by opening and closing dampers inside ductwork based on signals from sensors located within the system itself as well as those sent by remote devices such as room thermometers or wall-mounted digital controls. When these components are out of sync, your home may become too warm or too cool despite your best efforts to adjust settings manually.

In some cases, simply replacing a faulty component may resolve the issue; however if you suspect more complex underlying causes then professional assistance should always be sought before attempting repairs yourself – especially when working with electrical components like circuit breakers and wiring connections which can present a safety hazard if handled incorrectly.

Refrigerant issues

When it comes to air conditioning systems, one of the most common issues that can occur is a refrigerant issue. Refrigerant is responsible for transferring heat from inside your home to outside and if there’s an issue with the amount or type of refrigerant in your AC unit, you could experience several problems such as:

•Your AC running but not cooling
•AC not cooling but running
•AC not cooling enough
•AC blowing hot air instead of cold air.

In order to diagnose these types of issues, a professional HVAC technician must measure both the indoor and outdoor temperatures while also checking other components such as evaporator coils, condenser fan motors, and compressors. If any component isn’t working correctly then this could be causing a lack of cool air flow into your home or office space. It is important to note that without proper maintenance on an annual basis, many minor issues can become major ones due to improper installation or wear-and-tear over time. To ensure optimal performance levels year after year, it’s best practice to have regular maintenance done by certified technicians who are knowledgeable in all aspects related to heating & cooling systems so they can quickly identify any potential problem areas before they become severe.

Clogged air filter

A clogged air filter is one of the most common causes for an AC not cooling but running. When the air filter becomes blocked with dust, dirt, and other debris, it restricts airflow to the evaporator coil. This reduces heat transfer and prevents your AC from blowing cold air into your home or business. Furthermore, a clogged air filter can cause more serious issues such as freezing up of the evaporator coil as well as increased energy consumption due to overworking of the system.

In order to prevent these problems from happening in your unit, regular maintenance checks should be done at least twice a year that include changing out dirty filters for clean ones. Additionally, check-ups should also be done when you notice any signs that indicate something may be wrong with your AC such as if it’s running but not cooling enough or blowing hot instead of cold air. By doing this regularly you will ensure that all components are working correctly so there won’t be any surprises down the line where costly repairs could arise due to lack of proper maintenance practices being carried out on time.

Overall, having a clogged air filter is just one issue among many others that can lead to an inefficiently functioning HVAC system which can result in higher than normal utility bills and poor indoor comfort levels throughout buildings occupied by people who rely on their systems working properly during extreme weather conditions like summertime highs or wintertime lows. Its important then for professionals involved in managing HVAC systems understand how important taking care of them is and make sure they do regular maintenance checks every now and again so they don’t have unexpected breakdowns leading to expensive repair costs later on down road.
Dirty evaporator coils

Dirty evaporator coils are one of the common reasons why your AC may be running but not cooling or not cooling enough. It is important to clean and maintain your AC’s evaporator coils regularly to ensure that it functions properly. When dirty, these coils can cause a number of issues such as causing the air conditioner to blow hot air instead of cold air, or simply not cool at all.

The most effective way to clean an evaporator coil is by using a vacuum cleaner attachment designed for this purpose. This will remove dirt and debris from within the coil which could be preventing adequate airflow over its surface area. Additionally, you should also inspect any insulation around the coil itself for signs of damage or wear-and-tear, which could further reduce efficiency if left unchecked.

It is best practice to have your evaporator coils professionally cleaned every year in order to keep them functioning optimally; however, if they become excessively dirty between then you may need more frequent cleaning sessions depending on environmental conditions and usage levels in your home or office space. Regular maintenance will help prevent costly repairs caused by clogged up filters while ensuring optimal performance from your AC unit throughout its lifetime.

Electrical issues

Electrical issues with air-conditioning units can be a major source of frustration for homeowners. In some cases, the AC unit may be running but not cooling properly, or it may not be blowing cold air at all. Additionally, in many instances the AC is simply not cooling enough to keep a home comfortable during hot summer months.

The most common electrical issues that can cause an AC unit to run without providing adequate cooling are faulty wiring and circuit breakers that have tripped due to overloads on the system. If these problems are present, they should be addressed by a qualified electrician before any other troubleshooting steps are taken. It is also important to ensure that all components of the system—including filters and coils—are clean and functioning properly as dirty parts can reduce efficiency significantly.

Finally, if none of these solutions work then it could indicate more serious underlying electrical problems such as short circuits or damaged control boards which require specialized attention from an experienced HVAC technician who has knowledge about working with electricity safely and efficiently. Regardless of what issue you’re facing with your AC unit, addressing potential electrical problems should always take priority over replacing worn out parts or adding refrigerant since this will help prevent further damage down the road while ensuring optimal performance from your air conditioner for years to come!

Frequently Asked Questions

What could be the reason for my air conditioner is running but not cooling?

The most likely cause of an air conditioner running but not cooling is that the refrigerant level has become depleted, resulting in a reduced flow of cool air.

Why is there no cold air coming from my air conditioner even though it’s still running?

It is likely that the air filters are blocked, which is preventing cold air from entering and leaving the unit.

How can I fix an issue when my AC is blowing hot rather than cool air?

To fix an issue with the air-conditioning unit blowing hot rather than cool air, check the thermostat settings, ensure the AC is receiving power and adequate voltage, check all components for blockages or damage, clean or replace filters as necessary and inspect fans to assess if they are functioning correctly.

Could something be wrong if my AC isn’t cooling enough even after being on?

Yes, it is possible that something may be wrong if your air conditioner is not cooling adequately even after being on. It could indicate a mechanical or electrical issue with the unit, and you should have a qualified technician examine it as soon as possible to determine the cause of the problem and facilitate repair.


It is important to understand why the air conditioner may be running but not cooling. This could be due to various factors such as a lack of refrigerant, damaged seals, issues with the compressor, or clogged filters. Additionally, an AC that appears to not cool enough could have problems with airflow deficiencies or the too-warm system’s settings. Lastly, one should ensure there are no duct leakage and insulation issues when it appears the AC is blowing hot air instead of cold air. Understanding all these factors will help remedy any faulty operations of your Air Conditioning unit to restore its efficiency and performance.

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Address:   4040 SE International Way
STE E105 Milwaukie, OR 97222

Hours:   Mon – Fri: 7AM – 6PM
Sat – Sun: by Appointment

CCB#   187834