Then again, even with an understanding that there are two filtration layers in a system, you might miss that there are two or more return air registers in the home. Sometimes a homeowner forgets about the second filter layer and it clogs up almost solid, severely restricting air flow. Be sure to check your air filter first.Īlso, we occasionally inspect air conditioning systems that have filters installed in two locations-both behind the return air registers and at the base of the air handler (inside unit of the air conditioner). The most likely cause of poor air flow is also the simplest to solve: a dirty air filter.
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