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Is my Ac air handler filter the right size
Hey all, I replaced my old 3.5T ac 25 yr old unit with new. Approx. 2200 sg. ft. home/ 2 levels with open area in the middle. Everything was working fine, just needed electric back up heat to my wood stove and looking for efficiency. The old was replaced with same size, no changes to duct, no work in the attic...just a new compressor and air handler. No tests or measurements, the company just went off the old size since it was working. Issues....I have 2 return vents that will not hold a Kleenex up to register when running, a few of the others will that are closer to the unit. Also, when the temp outside is 85 it will not keep up with 72 on the thermostat. Runs all day non stop. Again...nothing else was changed, and it was working before. They did tell me they had to put a smaller (hgt wise) unit in do to space. This unit only has a 20x16 filter. The old was at least 22x22 if not a 24x24. Is the smaller filter area not sucking enough? Starving? They did do a temp check and had 49 at the unit and 53 at a register 30 ft away. If i run with the filter out will I be able to tell anything? Do I need a 4 ton unit? Thanks for any help you all can give.