I WAS SURPRISED BY HIS COMMENTS. HE TOLD ME THAT IT IS MORE IMPORTANT TO CHANGE THE FILTERS AFTER 1-2 MONTHS AND THAT MORE EXPENSIVE FILTERS WILL INCREASE YOUR HVAC SYSTEM AND THEREFORE SHORT THE LIFE OF YOUR SYSTEM (EG COMPRESSOR). USE A LESS EXPENSIVE FILTER AND SPRAY A LIGHT COAT OF COOKING SPRAYER ON THE FILTER SURFACE TO REMOVE LARGE PARTICLES. I HAVE THIS FROM INSTALLATION AND CHECK OUR SYSTEM EVERY YEAR. THE HVAC TECHNICIAN (from another company) ALWAYS NOTICES HOW CLEAN OUR OUTDOOR UNIT IS AND WILL APPRECIATE OUR INTERNAL FILTER TO PROTECT OUR SYSTEM.
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