Why do furnace and air conditioning manufacturers place low Merv rated filters in their new equipment?
All equipment manufacturers sell upgraded filtration options. In my opinion the reason these same manufacturers place low Merv rated filters in their furnaces and air handlers is due to the fact that most homeowners never touch their filters. We see homeowners all the time that rarely if ever replace their filters. If manufacturers installed say Merv 11 filters in their equipment and the homeowner did not replace it at the appropriate time the restricted air flow caused by this efficient filter being clogged would cause the equipment to not operate properly.
