Why isn’t my Central Air Conditioning system blowing air?
The most common problem causing no air flow is a highly restricted (dirty) air filter. Most central air conditioning systems have a 1 inch thick disposable filter somewhere on the intake side of the air handler/furnace. It could be in a “filter grill” located in the house or in a “filter base” if located in a mechanical closet where the air handler/ furnace is, or in a “filter plenum” if air/handler/furnace is in the attic. This size filter should be replaced at least every 90 days or more often. Some systems have thicker filters that can go for 6 months to a year before requiring replacement, these are usually found in the mechanical closet or in the attic. Highly restricted filters reduce air flow considerably and possibly completely.

