Low or No Airflow in Spokane, WA

Spokane's housing stock tells a story. A significant wave of construction happened here 15 to 20 years ago - neighborhoods across the South Perry District, Kendall Yards, and Browne's Addition saw infill and new builds during that period. Builder-grade AC equipment installed during those booms is now hitting the end of its designed lifespan. Components that were adequate at installation are now worn, undersized for how the home has evolved, or simply failing.

Here are the most common mechanical causes of low or no airflow:

1. Clogged or collapsed air filter A dirty filter is the most common cause - and the easiest to fix. But a filter that's been ignored long enough can collapse inward and partially block the return air opening entirely. At that point, it's not just dirty; it's physically obstructing the system.

2. Frozen evaporator coil When airflow drops for any reason, the evaporator coil gets too cold and ice forms on its surface. That ice layer acts like insulation - it blocks the coil from absorbing heat and chokes off airflow through the air handler. You may notice ice on the refrigerant line near the indoor unit.

3. Blower motor failure or weak capacitor The blower motor is what physically moves air through your ducts. If the motor is failing, or if the run capacitor that helps it start and maintain speed is weak, the motor may spin too slowly - or not at all. You'll hear the system running (the compressor outside may be on), but little to no air moves indoors.

4. Duct leaks or disconnected duct sections Conditioned air may be escaping into your attic, crawl space, or wall cavities before it ever reaches your vents. This is especially common in homes where ductwork has been modified over the years or where flex duct connections have loosened. You're cooling spaces you don't live in.

5. Blocked or closed supply/return vents Furniture pushed against a return vent, closed dampers, or debris in a duct can restrict airflow to specific zones or the whole system.

6. Dirty evaporator coil Even without ice, a coil coated in dust and debris acts as a barrier. Air has to push through that layer to reach the coil surface, and resistance builds up over time. Annual maintenance is supposed to catch this - but many systems go years without it.

7. Oversized or undersized ductwork In some Spokane homes - particularly those that had HVAC systems replaced without a full duct evaluation - the duct system may be mismatched to the equipment. Too much restriction in the supply side, or not enough return air capacity, creates chronic low-airflow conditions that no single repair will fully fix.

Before you call, run through these checks. Some of them you can resolve yourself.

• Check your air filter. Pull it out and hold it up to light. If you can't see light through it, replace it. If it's collapsed or bent, replace it immediately.
• Check every supply and return vent in the house. Make sure none are blocked by furniture, rugs, or closed dampers.
• Look at the indoor unit (air handler). If you see ice on the refrigerant line or on the unit itself, turn the system off and let it thaw. Running it while frozen can damage the compressor.
• Check your thermostat fan setting. Make sure it's set to "Auto," not "On." "On" runs the fan continuously but doesn't mean the AC is cooling.
• Listen. Can you hear the blower running inside? If the outdoor unit is running but you hear nothing from the air handler, that points toward a blower issue.

If you find ice, turn the system to "Fan Only" (or off) and let it thaw for a few hours before restarting. If it freezes again, there's an underlying cause that needs diagnosis.