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Posted by on December 10, 2006, 11:21 am
On 9 Dec 2006 06:59:51 -0800, trader4@optonline.net wrote:
>
>Al wrote:
>>
>> >My last house had a heat pump. One winter I closed off several vents to
>> >rooms that I do not use, thinking it would warm up the rest of the house
>> >faster, and cheaper. Wrong. It shut down, and a guy came out and fixed
>> >it for $60 by adding a booster. Not exactly sure what that was all
>> >about but it worked for the last eight years I lived in that home. He
>> >also told me that with a heat pump you cannot close off the vents.
>> >
>> >Now, in my present home, I have a furnace only. Is it safe to close
>> >vents in several bedrooms that I don't use.
>> >
>> >Thaanks.
>> >
>> >Kate
>>
>>
>> You should not close vents in any rooms. It effects the static
>> pressure of the system and on a gas furnace can cause your system to
>> overheat and trip on the high limit switch.
>>
>>
>>
>>
>> http://www.thehvacmedic.com - All the free heating and air answers you want!
You are correct when you say "any properly designed system" and
therein lies the rub. Most systems I see are not designed properly, as
in no load calculation done, no airflow calculation done... I could go
on all day about the hack stuff I see every day, in short, closing the
duct work is not recommended by the manufactures of most systems. It
causes excessive static pressure on the ducts which affects airflow,
which can cause a limit to open and in extreme cases can cause the
heat exchanger to crack. If you want to close yours then have at it.
>
>
>
>If closing the registers in any room is so bad, then why does every
>house I've ever lived in have registers that can be fully closed? In
>any properly designed and installed system, you'd have to close a hell
>of a lot of registers to reduce airflow to the point that the high
>limit switch cuts off the furnace.
http://www.thehvacmedic.com - All the free heating and air answers you want!
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