Recently moved in to a house and noticed poor airflow coming from the HVAC vents. Here's the setup:
Two story house , ~3300 SQFT with duct work throughout the floor/ceiling between both floors. Return vent is 6" x 29". Floor vents on top floor, ceiling vents on bottom floor. I closed all the bottom floor vents to try to force more air to the upper floor (lower floor is always cooler than upper floor anyway).
What I've checked so far: Opened up the air handler tower.
Noticed ice forming at lower 1/3rd of the A coils but the A coils appear perfectly clean.
Noticed it has dip switches for configuring different CFM (350, 400, 450). I changed it from 400 to 450. Negligible difference. It is configured for the maximum size outdoor unit which I think is about 3 tons.
Used a smoke match to look for air leaks in the tower and noticed a few where the coolant pipe enters the tower and where the condensation drain pipe exits. These might bypass the coils and they definitely bypass the filter, but I doubt this is really the problem.
Had an HVAC technician out here about a month ago as part of a service plan that came with the house. He cleaned the A coils with some kind of liquid spray and did some temperature sensor checks. If I remember correctly there was about a 9 degree differential between the return vent and a floor vent.
Now what?
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