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Old 01-08-2010, 02:25 PM   #1
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Cold Air Return Question


I own a 2 story home with unifished basement above ground. I'm planning to heating on the basement by adding a new register/vent in the FlexRoom by adding a new dutc feeding off existing furnace that is locate in the basement.

The basement has the following rooms:
1) Furnace Room
2) Storage Room (8x4)
3) Foyer
4) Flex Room/Media Room/Home Theatre (17x10)
The total sfq of the basement is 26x11.The ceilings are 8' in eight.

What is the best way to heat the basement?

1) Install one register in the flexRoom
2) Install one register in the flexRoom + cold air return in flexRoom
3) Install multiple registers? Where?

Should I install a cold air return as well? My neighboor advised against installing cold air returns because of room size as well being concerned that would carry sound out from FlexRoom/Media Room?

NOTE: There are currently 2 cold-air returns, one on main floor, the other on the 2nd floor. Do I need one on the basement as well?

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Old 01-08-2010, 06:19 PM   #2
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Cold Air Return Question


Hard to put air into a room that the air is being taken from also.
Causes negative pressure in other rooms in the house, and draws in excess fresh air from the outside.

If you want to be able to use the flex room. You won't use your current furnace and duct system.

The thermostat isn't in that room. So it won't know that the room is warm from the people and entertainment system. And when the heat comes on you will roast.

Same in summer. Thermostat won't know the room is warm while its being used, and will start the A/C and freeze the room.

Then, when the room isn't being used. it will be over cooled.

A ductless mini split would be your best bet.

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Old 01-08-2010, 07:31 PM   #3
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Cold Air Return Question


[quote=beenthere;379131]Hard to put air into a room that the air is being taken from also.
Causes negative pressure in other rooms in the house, and draws in excess fresh air from the outside.

I'm planning pull combustion air from the outside. This afwully will resolve issues with negative pressure.



The thermostat isn't in that room.
No. What if I add an additional thermostat /or thermostat sensor to basement ?

Would that work. Or should I still go with dutchless solution.
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Old 01-08-2010, 07:47 PM   #4
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Cold Air Return Question


Go ductless split unit.

2 stats wouldn't really work well. The opposite area would get either too warm or too cold.

Combustion air is for combustion. Not for equalizing the return system.
Bringing in unconditioned fresh air adds load the system. And in winter time. Dries out the homes air.
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