Expert Ductwork Modificationsfor Portland Metro Homes
Custom duct design, system rebalancing, and zone additions. Maximize comfort and efficiency with properly configured ductwork.
Why Portland Homeowners Choose Our Ductwork Team
With our in-house sheet metal shop, we design and fabricate custom ductwork solutions for every Portland home.
When Your Ductwork Needs Modification
Incorrectly sized or poorly-designed ductwork is the #1 reason Portland homeowners aren't comfortable. Many homes—especially older Portland bungalows, ranches, and split-levels—have undersized ducts, too few return air paths, or poorly placed registers. When you add rooms, finish a basement, or upgrade your HVAC equipment, existing ductwork often can't keep up. Our NATE-certified technicians use Manual D calculations to design modifications that deliver balanced airflow to every room.
Ductwork Modification Services We Offer
From minor adjustments to complete system redesigns, we have the expertise and equipment to handle any ductwork project in Portland Metro.
System Rebalancing
Adjust dampers, resize ducts, and modify registers to deliver even airflow to every room. Fix hot/cold spots without replacing your entire system.
Zone Additions
Add ductwork to new rooms, finished basements, attic conversions, or home additions. We integrate new zones seamlessly with your existing system.
Custom Fabrication
Our in-house sheet metal shop creates custom plenums, transitions, and duct sections. We fabricate exactly what your Portland home needs.
Trunk Line Upgrades
Undersized trunk lines starve rooms of airflow. We can upsize main ducts to handle larger HVAC systems or extended duct runs.
Register Relocation
Move registers to better locations, add returns for improved circulation, or switch from floor to ceiling registers for better comfort.
Damper Installation
Install manual or automatic dampers to control airflow to different zones. Balance your system without expensive zoning equipment.
Signs Your Portland Home Needs Ductwork Modifications
Rooms That Won't Heat or Cool
If certain rooms are always too hot in summer or too cold in winter—no matter how you set the thermostat—undersized ducts or poor duct design is likely the cause.
Weak Airflow from Vents
When you hold your hand to a register and barely feel air moving, the ductwork may be undersized, have too many bends, or be restricted by crushed flex duct.
High Energy Bills
Inefficient ductwork forces your HVAC system to run longer to maintain temperature. If your PGE or NW Natural bills seem high for your home size, ductwork could be the culprit.
Noisy Duct System
Whistling, popping, or banging noises from your ducts indicate airflow problems. Undersized ducts create high-velocity air that whistles; improper supports cause banging.
Recent Home Renovations
If you've added rooms, finished your basement, converted your attic, or removed walls, your existing ductwork probably needs modifications to serve the new layout.
New HVAC Equipment
Upgrading to a larger furnace or AC requires matching ductwork. Many Portland homes have ducts sized for older, smaller equipment that can't handle modern high-efficiency systems.
Experiencing These Issues in Your Portland Home?
Our technicians can assess your ductwork and recommend the right modifications for your situation.
Call (503) 698-5588 for Free AssessmentOur Ductwork Modification Process
Engineering-based design with professional installation for results that last.
Comprehensive Assessment
We inspect your entire duct system, measure airflow at each register, and identify restrictions, leaks, and design flaws. We also assess your HVAC equipment capacity and your comfort goals.
Manual D Design
Using Manual D calculations (the industry standard for duct design), we engineer modifications that deliver the right CFM to each room. No guesswork—just proper HVAC engineering.
Custom Fabrication
Our in-house sheet metal shop fabricates custom ductwork, plenums, and transitions. We build exactly what your Portland home needs—not generic parts that sort-of fit.
Professional Installation
Our NATE-certified technicians install all modifications with proper supports, sealed connections, and insulation where needed. We protect your home during work and clean up completely.
Airflow Verification
After installation, we measure airflow at every register to verify balanced delivery throughout your home. We adjust dampers and make final tweaks to optimize performance.
Serving Portland Metro Area
Professional ductwork modifications throughout the greater Portland area
Portland Ductwork Modification FAQs
Signs include rooms that don't heat or cool properly despite your HVAC running, weak airflow from vents, high PGE or NW Natural bills, noisy ducts, or if you've made renovations or additions. Poorly sized ductwork is the most common reason Portland homeowners experience comfort issues—especially in older homes built before modern HVAC sizing standards.
We frequently add returns to improve airflow balance (many Portland homes have too few returns), upsize trunk lines for newer high-efficiency equipment, add zones for finished basements or attic conversions, and rebalance systems to fix hot/cold spots. Our in-house sheet metal shop fabricates custom solutions for any situation.
Most residential modifications take 1-3 days depending on scope. Simple changes like adding a register or damper may be same-day. Larger projects involving trunk line work or multiple zone additions typically take 2-3 days. We provide a detailed timeline with your estimate.
It depends on the scope. Minor modifications like adding registers or dampers typically don't require permits. Major work involving new duct runs, equipment changes, or structural modifications may require permits from your local jurisdiction. We handle all permitting when required.
Costs vary widely based on scope. Simple damper installations or register additions might be $200-500. System rebalancing runs $500-1,500. Major modifications like trunk line upgrades or zone additions range from $1,500-5,000+. We provide detailed written estimates before any work begins.
Related HVAC Services
Duct Cleaning
Remove dust, allergens, and debris for cleaner air and improved efficiency.
Duct Sealing
Seal air leaks to maximize efficiency and comfort throughout your home.
Duct Insulation
Prevent energy loss and condensation with proper duct insulation.
Furnace Installation
Pair your modified ductwork with a new high-efficiency furnace.
Ready for Better Comfort in Every Room?
Get a free ductwork assessment and discover how modifications can transform your home's comfort.
Free assessments • In-house fabrication • Since 2008