close off A/C vents in winter??


Old 11-03-07, 06:47 PM
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close off A/C vents in winter??

I recently had central A/C installed. (My first ever experience with central). The air handler and all ductwork are in the attic (a 1 story house).
This has resulted in a completely separate system from the forced air heating system-different thermostats, ductwork-everything.

My question: during heating season, do I need to close off the ceiling vents (A/C)- to avoid having the hot air rise into the A/C ductwork-and loose the heat??

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Old 11-03-07, 07:14 PM
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Yes you can do that. Your assumption is correct in that the hot air will rise and enter the A/C registers.
Old 11-03-07, 07:56 PM
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Yeah they should be closed off however the problem is that you want to be sure to open the vents before running the system next spring. Perhaps you can do something like turn off the disconnect breaker and attach a note to it that states that the vents must be opened before the system is turned on that way you know it will be done.
Old 11-03-07, 09:44 PM
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Yeah, forgetting to open them in the summer would be a bad deal.
Old 11-05-07, 10:19 AM
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I too have a system with the air handler and ductwork in the attic. This is my first winter with it. I remember reading somewhere that I should take the filter out of the one large return that's in the hallway of our second floor, put a trash bag over it, and then put the filter back into the return vent. Your post reminded me to do that! I ended up using two kitchen size trash bags, one over one side of the filter and one over the other (they overlap and ensure that it's completely sealed up).

My system is a spacepak. The installer didn't give me any vent covers for the little round vents in all of our rooms...I guess I'll have to call to see if they can order some for me.
Old 11-06-07, 10:36 AM
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If the home has a lot of humidity in it in the winter. You might find that to just close the dampers on the registers dont do it. We have had a lot of homes that in the winter time you have to take the registers off and put a trash bag filled with insulation or just crushed up newspaper up in the pipe there and put the register back. If not water can drip out of the registers.
Old 11-09-07, 12:45 AM
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At 3:30 am, I'm glad that i found this forum and this specfic question. Water dripping from the register above my bed has woken me up the past 3 nights. The temp here in Delaware has dropped to around 30 degrees F, and my house temp is approx 68 degrees. The weird thing is, water only drips out of the register above my bed and none of the other ones. Since it is a stand alone AC unit, (i have baseboard heating otherwise), I should start by closing all the registers, and closing off the return vents, with the possibility of having to do more to keep the water from dripping.

This is my first house, we just moved in back in the summer. Still getting used to some things around here.
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