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Old 08-01-2011, 04:30 PM   #1
jzw
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Central AC unit with no filter and return?


I just closed on a house and moved in last week. House is old (80+ years) with 2 central AC units added in the past 10 years. I wanted to change filters. Somehow I cannot find the filter for one of the units. The unit is installed in the garage and only cools the rooms above the garage (dining room and kitchen). I can see the return duct. But it is not connected anywhere. It basically is closed at the end. And no filters can be seen from the rooms. Is it possible for an AC unit installed with no filter?

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Old 08-01-2011, 05:57 PM   #2
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Central AC unit with no filter and return?


do you have return grills in either room?the return duct is capped at both ends?if you pop the fan access panel do you have an openng where something of air comes into the fan section?if the garage is cool just a filter on the actual air handler would do,but a ducted return will cost you the effort for true AC.if you can drop a flex down from each room into that duct and connect it to the unit with a filter the unit will run as most do

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Old 08-01-2011, 06:17 PM   #3
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Central AC unit with no filter and return?


I can not see how it is legal to have a hvac system in a garage. It screams code violation in multitudes.
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Old 08-01-2011, 08:33 PM   #4
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Central AC unit with no filter and return?


In a mobile home I have seen the filter on the interior grill of the return, but that had an external furnace/AC. It was ghetto!
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Old 08-01-2011, 08:48 PM   #5
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Central AC unit with no filter and return?


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Originally Posted by Mrdippy View Post
In a mobile home I have seen the filter on the interior grill of the return, but that had an external furnace/AC. It was ghetto!
That is not ghetto, that is how it is done. The same way with units placed in the attic. It is easier to replace the filter that way.
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Old 08-02-2011, 08:59 AM   #6
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Central AC unit with no filter and return?


It's called a Return Air Filter Grill, millions of them out there and convenient.
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Old 08-03-2011, 07:43 AM   #7
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Central AC unit with no filter and return?


A quick update... I finally found the return by checking every inch on the first floor which is directly above the return duct. Finally I found the return grille tucked away at the bottom of a cabinet right above the floor. First, the return openning is so small, about 2 inch x 4 ft. And it is dusty.. I vacumed it... There is no filter behind it as far as I can see. I wonder if the filter is inside the unit. The unit at my old place has a filter right at where the return duct goes into the blower housing. I don't see it on this unit. I may have to just take off the cover of the unit and check inside.

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