The Filterbuy Merv 13 air filter is a good air filter for the winter time. The air blower motor speed for the Lennox Furnace runs at a slower speed than the AC Blower Motor Speed for the Lennox AC system, so that Merv 13 is perfect. However, when using The Lennox AC System with the Merv 13, the blower motor speed is higher and the Merv 13 causes an error to occur in the Lennox System, indicating that the filter is causing the blower motor to run at a reduced speed because the air is obstructed by the filter. Changing the filter to a less thicker filter clears the error code and the air conditioning runs smoothly without causing an error code.
I recently signed up for auto ship of 20x30 and 14x14 both MERV13. I can literally breathe easier especially at night. The filters can quickly and in good condition. There is less dust, pollen, and dirt on the furniture and rugs, too. Thank you!