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Old 06-29-2010, 09:27 AM   #1
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Adding a return or vent or both?

Need some help on either to add a return or a register to a 2 story houses. Have the upstair unit with 2 ton replace it with a 3 ton a year ago.

There is a hot spot in the house near the thermostat. I’m thinking about to put in either a return to suck the hot air out or put in a register there or both. Notice all the registers are located inside the rooms. There is no register out in the open or in the hallway. Thermostat won’t go below 83F from 1 P.M. to 7 P.M when outside temperature is around 100F. All of the rooms are cold.

Got 4 registers going in 4 bedrooms and 2 small registers go into the bathroom. There is a 20” x 20” return above floor level right on hallway that go inside the wall and up in the attic. The thermostat is mounted 3 feet above the 20” x 20” return.

Can I put another 20x20 or smaller return in the ceiling where the hot spot are and T it to the existing return?


Last edited by max2k; 06-29-2010 at 10:07 AM.
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Old 06-29-2010, 11:44 AM   #2
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Did they just use the wall cavity. Or is it boxed out to 20X20 also? If just the wall cavity, its too small.

A 20X20 return air filter grille is only really good for a 1.5 ton A/C, or smaller. If its just a return grille, it good for about 1.75 tons.
If its chaised out and using a 20X20 chaise.

What size is the return duct going to the unit. Should be 16" round if sheet metal, 18" round if flex duct.
A return added to the ceiling, should help alot. Since most of that heat, is from the first floor.


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Old 06-29-2010, 04:33 PM   #3
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Thank you for replying. It's a wall cavity with 16" flex duct. Will add a return to the ceiling. Thanks again beenthere for your help, I really appreciated.
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