Low or No Airflow in Nine Mile Falls, WA

Here are the most common root causes:

1. Clogged or collapsed air filter A dirty filter is the most common cause of restricted airflow. When a filter gets packed with dust and debris, it acts like a wall. Air cannot pass through. The system starves. Filters in this area get loaded up fast, especially during dry, dusty Eastern Washington summers.

2. Blower motor failure or degraded performance The blower motor is the fan that pushes conditioned air through your duct system. As motors age, they lose torque. Bearings wear. Capacitors - the small electrical component that gives the motor its starting and running power - weaken over time. A weak capacitor is a very common failure point on systems in the 10-to-15-year range. The motor runs, but it cannot spin fast enough to move adequate air.

3. Frozen evaporator coil Restricted airflow causes the coil to freeze. But the reverse is also true: a refrigerant issue or a dirty coil can cause freezing that then restricts airflow further. It becomes a cycle. You need to know which came first.

4. Blocked or closed supply and return registers Furniture pushed against a return vent, a closed damper, or a register that has been accidentally shut can reduce airflow to specific rooms or to the whole system.

5. Duct leaks, disconnections, or collapsed sections Ductwork in older homes - and in some builder-grade installs - can develop leaks at joints, or flex duct can collapse or kink inside walls and crawlspaces. When conditioned air escapes into your attic or crawlspace instead of your living area, you feel it as weak airflow at the vents.

6. Dirty evaporator coil Over years of operation, the evaporator coil collects a thin layer of dust and debris. That layer acts as insulation, reducing the coil's ability to absorb heat and restricting airflow across its surface.

7. Oversized or undersized duct system If your system was never sized correctly from day one - or if a previous contractor added equipment without adjusting the ductwork - the system may have always struggled to deliver adequate airflow.

Before you call, run through these checks. They take five minutes and may save you a service visit - or at minimum, give us useful information when we arrive.

• Check your air filter. Pull it out and hold it up to a light. If you cannot see light through it, replace it. Use the same size and MERV rating as the original.
• Check every supply and return register in the house. Make sure none are blocked by furniture, rugs, or closed dampers.
• Check your thermostat setting. Make sure it is set to COOL and the fan is set to AUTO, not OFF.
• Look at your indoor unit. If you see ice on the refrigerant lines or on the unit itself, turn the system off and set the fan to ON (not AUTO). Let it thaw for a few hours before restarting. If it freezes again, call us - there is an underlying cause that needs diagnosis.
• Check your circuit breaker. A tripped breaker to the air handler can reduce or eliminate airflow even if the outdoor unit is running.

If you replace the filter and the airflow does not improve within 30 minutes of restarting the system, the problem is something else. Time to call.