I just had my furnace and AC replaced. New furnace is 110,000 BTU Carrier 58ctw-110. An 8 inch return air base was supposed to be installed but wrong instructions were given to the installers and they only put in 4 inches. The HVAC company owner is now telling me an extra 4 inches won't make much difference, but it will mean 24 inch filters instead of 20 inch filters since he can only cut a 16 inch hole in the side of the furnace. And 24 inch filters are harder to find. Should I make him fix his mistake?
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