I have a high efficiency Space Gard filter at my blower. My two return air grates are sized for the standard disposable filters that need to be replaced on a regular basis – they fit in the opening behind the grate. The company that installed the heat and air system recommended using the filters at the return air grates for extra filtration. However, the company that services my heat and air now recommends not using them. This company said it makes the blower work too hard and the high efficiency filter is all that is needed. Can anyone give me insight as to who might be correct?
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