Quick answerDuct repair and sealing in Spokane starts with an inspection of the runs in the crawlspace, attic or garage, looking for disconnected boots, crushed flex, gaps at joints and missing insulation. We reconnect and replace damaged runs, seal joints with mastic or foil tape, and insulate runs in unheated spaces, then measure airflow at the registers.
Updated September 2026
How leaky ducts waste heat
A supply duct leaking into a crawlspace heats the crawlspace. A return duct leaking in a garage pulls in garage air, dust and fumes. Either way, the furnace or heat pump runs longer and the rooms at the end of the line never quite get comfortable.
We inspect before we quote. Some houses have a single disconnected run that explains a cold room; others have dozens of unsealed joints that add up to a real efficiency loss. We show you photos of what we find and fix what matters most first.
What affects duct repair cost
Duct repairs we make
Aeroseal-style duct sealing
When leaks are spread through ducts we cannot reach, inside walls, floors and ceilings, internal sealing is the practical option. The duct system is pressurized with a sealant mist that collects at the leak edges and closes them from the inside, while the registers are blocked off. The process measures leakage before and after, so you see the improvement in numbers. It works best on sheet metal systems with many small leaks, and it is not a substitute for reconnecting runs that have fallen apart.
Crawlspace duct repair
Crawlspaces are where we find the most damage: flex duct pulled off its boot, runs lying in the dirt, insulation torn by animals and joints that were taped once and have long since let go. We reconnect runs with proper collars and straps, replace crushed or torn flex, hang ducts off the ground, seal every joint with mastic and wrap runs with fresh insulation. We also check for signs of rodents in the ducts and clean or replace runs they have used.
Disconnected and crushed runs
A single disconnected or crushed run can leave one room cold while the rest of the house is fine. It is one of the most common findings behind a complaint about a back bedroom, a bonus room over the garage or a basement office. We trace the run from the register back to the trunk with a camera or by hand, fix the break, and replace sections that were stepped on or pinched by framing. Airflow at that register is measured before and after.
What you can check yourself
| You can check | Leave for us | |
|---|---|---|
| Registers | Make sure they are open and unblocked | Weak flow from an open register |
| Visible ducts | Look for disconnected flex in the basement | Crawlspace and attic runs |
| Filter | Keep it clean | Return leaks |
| Tape | Do not use cloth duct tape on ducts | Mastic sealing |
Ducts in unheated spaces around Spokane
In Spokane, where the heating season is long, ducts that run through crawlspaces, attics and garages spend most of the year surrounded by cold air. Every leak and every uninsulated section loses heat for months at a time, not a few weeks. That is why sealing and insulating those runs is one of the better value repairs we do here, especially before a new furnace or heat pump goes in.
How a duct repair visit runs
- 1
Measure airflow
Register readings taken before work.
- 2
Inspect
Crawlspace, attic and garage runs checked.
- 3
Photograph findings
You see what we see.
- 4
Quote
Priority repairs listed first.
- 5
Repair
Runs reconnected, replaced and hung.
- 6
Seal and insulate
Mastic on joints, insulation on cold runs.
- 7
Measure again
Airflow compared to the starting readings.
Signs your ducts need repair
Duct repair questions
How do I know if my ducts leak?
Cold rooms, weak airflow, a dusty house and high bills are common signs. An inspection confirms it.
Is duct tape okay for sealing ducts?
No. Cloth duct tape dries out and fails. Mastic or foil tape rated for ducts lasts.
Can you seal ducts inside walls?
Yes, with internal sealing, which closes leaks from the inside.
Should I fix ducts before a new furnace?
Yes. Leaky ducts waste the efficiency you are paying for in new equipment.
How long do duct repairs take?
Most crawlspace repairs take a day; larger jobs take two.
Other air quality & ductwork services we handle
Whole-House Humidifier Installation
Sized, quoted and permitted.
Whole-House Humidifier Installation detailsHVAC Inspection for Home Buyers
Seasonal service, fewer breakdowns.
HVAC Inspection for Home Buyers in SpokaneSmart Thermostat Installation
Sized, quoted and permitted.
How we handle smart thermostat installationGet the heat to the rooms, not the crawlspace.
Call about duct repair and sealing in Spokane, WA.
