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Cannot Find where air filter is?

I recently bought a one level ranch home built in 1988. I want to change the air filter which seems like it would be located under the house where the HVAC unit is located, but I cannot find where the filter is on the unit? When I recently went under the house, I checked out where this may be and was suprised to see a filter laying next to the unit! From where I could reach, I could not find where this could have come from? To describe the unit, it is a grey box about 6' long x 2' wide. There are 3 ducts coming off it as well. I cannot see a product id #, model name/#, etc. Does someone have an idea of where this filter came from?????

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You are looking for a thin cover that is held on with 1 or 2 screws.
(The one pictured in the circle,Yours may be located in the middle or opposite end)

Example:
Cannot Find where air filter is? - 93649d7.jpg
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Posted on Feb 09, 2009

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My Goodman CK361D unit blows cold air from the vents and it is cold when you stand there. But it doesnt seem to push it throughout the house. we can run it for hours and it will still be over 70 degrees in...


There are alot of factors when dealing with this problem. Heat Load ( Typical A/C unit is designed with a split of 20 degrees farenheit.) If you measure the temperature leaving the discharge registers, the temperature should be around 20 degrees colder than the air entering the return air grille (Filter Location). Also your unit seems to be a 3 ton; In which this system is designed for roughly 450 sq. ft. per ton and can go as high as 550 sq. ft. on newer homes with more than adequate insulation values. On older homes with minimual insulation the 400- to 450 sq.ft. rule per ton should be observed. Another reason could be that the units needs servicing like a dirty condenser coil or evaporator coil, improper refrigerant charge, etc can all be issues that can result in your problem.
Finally, most typical units or designed to maintain a home 20-25 degrees below outside temperature. Example 95 degrees outside, inside should not be set lower than 70 to 75 degrees, and the 5 degree range depends on the SEER (Seasonal Energy Efficiency Rating/Ratio ) of your unit. Hope I was helpful in giving you some direction in things to look for to resolve your problem.

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1 Answer

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