Rooms far warmer or colder than others
Large swings between rooms often mean branches are undersized, too long or missing altogether for that area.
Ductwork installation and replacement in Kalamazoo
Rooms that never reach the thermostat setting, a furnace that roars at the registers, or ducts patched together over decades usually mean the duct system, not the equipment, is holding the house back.
- Answered 24/7
- Kalamazoo and Coloma offices
- Price before work
Added return air run$412 to $963Answered 24/7
Quick answer
Ductwork installation replaces or adds the supply and return ducts that carry air between your furnace or air handler and each room. A technician calculates room loads, sizes trunks and branches, installs sheet metal or insulated flex where suitable, seals joints with mastic and balances dampers. A full replacement in an accessible basement often takes two to four days.
Your furnace and air conditioner can only deliver comfort as well as the ducts carry it. Many Southwest Michigan homes have duct systems that were never designed for the equipment they serve now: an old gravity heating layout converted to forced air, a basement finished around undersized branches, or an addition tapped onto the end of an already stretched trunk line.
Our technicians design new ductwork from the room-by-room heating and cooling load, size each trunk and branch for the airflow it needs to carry, and seal every joint. Whether the job is a full replacement, a new trunk for an addition or more return air for a furnace that runs hot, the goal is quiet, even airflow to each room.
Signs you need ductwork installation & replacement
Loud whistling at registers
Air rushing through registers suggests the supply ducts are too small for the blower's airflow.
Only one or two return grilles
Many older homes have a single central return, which starves the blower and leaves closed rooms stuffy.
Rusted or crushed duct sections
Basement ducts that sat in damp conditions or attic flex that has been stepped on lose airflow and leak.
Addition or finished basement planned
New living space needs its own supply and return, sized properly instead of tapped onto the nearest run.
New equipment going in
A furnace or AC replacement is the right time to fix duct sizing, since new equipment depends on correct airflow.
Designing ducts from room loads
Good duct work starts with numbers, not guesses. Our technicians run a room-by-room load calculation that accounts for window area, insulation, exposure and ceiling height. That tells us how much heated or cooled air each room needs. From there we size every branch, the main supply trunk and the return path so the blower can move that air without excess static pressure.
The design also covers register types and placement. Supply registers under windows on exterior walls counter cold glass in winter, while high returns in two-story homes help pull warm air down from upstairs in summer. A layout like this replaces the old habit of copying whatever was there before, which is how many houses end up with the same comfort problems after new equipment goes in.
Materials and how they are joined
Main trunks and most basement branches are built from galvanized sheet metal, fabricated to fit the joist spaces and the run of the house. In tight attic or knee wall spaces, insulated flexible duct is sometimes the practical choice, but only when it is pulled tight, supported and kept short. Sagging or kinked flex is one of the most common airflow problems we find.
Every seam and joint is sealed with duct mastic or approved foil tape, not plain cloth tape that dries out and falls away. Ducts that run through unconditioned attics, crawlspaces or garages are insulated to keep warm air warm and to stop summer condensation. Takeoffs get balancing dampers so we can fine-tune airflow once the system is running, room by room.
- Galvanized sheet metal trunks and branches
- Insulated flex only for short, supported runs
- Mastic or rated foil tape on all seams
- Insulation on ducts in unconditioned space
- Balancing dampers at each branch takeoff
Older homes, conversions and additions
Homes in Kalamazoo's Stuart and West Main Hill areas often started with gravity warm-air furnaces or steam radiators. When forced air was added later, ducts were sometimes squeezed into wall cavities, old cold-air returns or closets, and the second floor ends up starved for air. Replacing those runs means finding new chases and sizing ducts so the upper rooms actually get the air they need.
Additions and finished basements bring a different challenge. Tapping a new room onto the end of an existing trunk leaves it with weak airflow, and many finished basements were closed in with no return at all. We can add a dedicated trunk, a new return or, where ductwork is impractical, recommend a ductless mini-split for that space instead. The right choice depends on how the room is used and how far it sits from the furnace.
Coordinating ducts with new equipment
A new high-efficiency furnace or variable-speed air handler is built to move a specific amount of air at a specific static pressure. Connect it to undersized or leaky ducts and it runs louder, works harder and may never reach its rated efficiency. That is why our technicians look closely at the ducts any time we quote furnace and AC replacement.
Sometimes only the return side needs work, such as adding a second return or enlarging the return drop at the furnace. Other homes need a new supply plenum and trunk to match the new equipment's connection size. Doing that work at the same time as the equipment swap saves labor, since the system is already shut down and opened up for the installation.
Typical ductwork installation & replacement costs in Kalamazoo
| Work | Typical range |
|---|---|
| Added return air run | $412 to $963 |
| New supply branch to one room | $286 to $718 |
| Replacement supply plenum and main trunk | $1,438 to $3,267 |
| Full duct system replacement, accessible basement | $4,876 to $9,684 |
| Addition or finished basement duct extension | $1,167 to $3,438 |
Ranges are typical for Southwest Michigan. The final price is set once the technician has measured the house, checked access and reviewed the load calculation with you. Compare more jobs in the furnace and AC price guide.
How a ductwork installation & replacement visit works
- Call and explain the comfort problemTell us which rooms struggle and what equipment you have, and we set a visit to measure the home.
- Load calculation and duct surveyThe technician measures rooms, notes windows and insulation and inspects the existing trunks, branches and returns.
- Design and written priceYou get a duct layout with sizes and a written price for the work, with options where they make sense.
- Fabrication and installationSheet metal is fabricated, old ducts are removed as needed and new runs are hung, sealed and insulated.
- Startup and balancingWe measure static pressure and room airflow, set the balancing dampers and confirm each room is getting its share.
Keep reading
Services that often go with ductwork installation & replacement
Duct Repair & Sealing
Mastic leak sealing, repaired joints, reinsulated attic runs and fixed disconnects so the air you pay to heat reaches your rooms.
Learn moreAirflow & Room Balancing
Static pressure tests, register airflow readings and damper settings that send heat and cooling to rooms that come up short.
Learn moreHVAC Zoning Systems
Motorized duct dampers, a zone panel and separate thermostats so one furnace or heat pump can heat and cool each floor on its own.
Learn moreWhere we handle ductwork installation & replacement
FAQ
Ductwork Installation & Replacement questions from Kalamazoo homeowners
Can new ductwork go into finished walls and ceilings?
Often, yes, using existing chases, closets, soffits or the space between floor joists. Sometimes a small soffit or a short drywall patch is needed. We plan routes to minimize opening finished surfaces and tell you exactly where any cuts will be before work starts.
Does old asbestos duct wrap have to come off before new ducts go in?
Some older Michigan homes have white paper-like wrap on ducts or joints that may contain asbestos. It should not be disturbed by our technicians. If we see suspect material, we stop and recommend testing and, if needed, removal by an abatement contractor before the duct work proceeds in that area.
How long does it take to replace basement ductwork?
An open, unfinished basement in a typical ranch or two-story home often takes two to four days for a full replacement. Finished basements, additions and second-floor runs take longer. We keep the heat or cooling running at night whenever the existing system can be reconnected temporarily.
Is flex duct as good as sheet metal?
For short, straight, well-supported runs, insulated flex works fine and is easier to fit in attics and tight spaces. It loses airflow quickly when it sags, kinks or runs too long. For main trunks and longer basement runs we use sheet metal, which holds its shape and is easy to seal.
Will bigger ducts make my furnace work less hard?
Correctly sized ducts, not oversized ones, are the goal. Ducts that are too small raise static pressure and make the blower strain. Ducts that are far too large slow the air down so much that it does not reach the end of the run. The load calculation sets the right size for each section.
Need ductwork installation & replacement today?
Call any hour. Our office answers, sets the visit and tells you what to expect before a technician arrives.