If so change the filter.
Armstrong furnace filters.
Armstrong filter replacement 20x25x5 merv 11 aftermarket armstrong filter armstrong air filters armstrong furnace filter for nominal size 20 x 25 x 5.
Check the filter monthly to see when it needs to be replaced.
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Your armstrong air furnace s electronic control system prolongs system life by continuously monitoring internal components for optimum performance and fault prevention.
Remember to change your filter approximately once a month.
Check your indoor unit to see or hear if the blower is running.
Armstrong air is the professional s choice in home heating cooling.
Dirty or blocked ductwork.
Check the furnace or air handler filter to see if it is blocked with dust and dirt.
Warranty armstrong air s commitment to a better product is backed by a limited lifetime warranty on the stainless steel heat exchanger and a 10 year limited warranty on parts.
Changing a home furnace filter regularly is the fastest and easiest way to make sure your furnace is running smoothly and efficiently as well as to help purify the air in your home.
Including oil gas furnaces air conditioners heat pumps package units air handlers.
Free shipping to the contiguous united states for orders over 99.