Was told that the air filters with a lower MERV rating allow the furnace/air conditioner to get air more easily and makes them run more efficiently.
Said the higher rated filters trap more pollutants (dust, animal dander, etc), but that cuts down on the amount of air which makes the furnace/air conditioner work harder (cost more to run).
Trane Hi Efficiency Furnace(92%) and air conditioner (13 SEER)
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