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k1114
sanjay's love child
 
HVAC question

I've got an upstairs "bonus room" that is reasonably well insulated and it has its own heating and air system. The heater doesn't work for shit in the winter because it's not designed for this climate (it's a heat pump that wont turn on if the outside temp is under 23 , which it often is)...

At the same time, our master bedroom, which isn't too far away, gets so hot that we often can't sleep in there at night in the winter (if the thermostat is 68 the house is 68 but the bedroom is probably 85). It's way unbalanced. The room has two registers and closing one basically does the trick, but it causes a horrible whistle in the vents on that side of the house since the pressure is so high.

I'm thinking of killing two birds with one stone and moving that second vent to the bonus room, which is actually not too far away (i'd say around 15-20 feet of duct). In the summer i'd just close the vent and use the A/C in that room, and in the winter I would leave it open and use the heat from the main unit.

Any problems with this plan?
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Old 02-27-2010, 08:29 AM k1114 is offline  
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IMFlacid
marter
 
as far as the whistling noise you can install a bypass damper, the best way would be to get someone to do a heat load calucation on the rooms (based on windows/walls/heat loss/heat gain etc)
use that to determine the proper cfms you should get in each room.

or set up a zoning system where only the tstats that are call for cooling will get it
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Old 02-28-2010, 06:51 AM IMFlacid is offline  
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k1114
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Quote:
Originally Posted by marter View Post
as far as the whistling noise you can install a bypass damper, the best way would be to get someone to do a heat load calucation on the rooms (based on windows/walls/heat loss/heat gain etc)
use that to determine the proper cfms you should get in each room.

or set up a zoning system where only the tstats that are call for cooling will get it

Well the plot thickens a bit... It turns out that the bedroom is hot in the summer too (I had forgotten), though it's nowhere near as bad. Makes no sense; I can decrease the airflow and suffer in the summer, or do nothing and suffer in the winter. I'm also worried about putting pressure on the system by closing a vent for half of the year. I've been told that it really hurts efficiency to close vents long-term (not sure if this is true).

I like the idea of a zoning system, but I hate the huge cost. I'm also hesitant to install anything that would modify the airflow of the existing system. I did have an idea similar to zoning though; I could install an in-line attic fan that is tied to a thermostat in that bedroom. I'd put the inlet in the bedroom and the exhaust somewhere central to the house (the house is basically one big room with some bedrooms). That way I can set a temp for the fan to kick in, thus circulating air and keeping things under control. Would work in both the summer and winter.

I suppose I could shell out the cost of having an evaluation done, but honestly that's like half the cost of my crazy vent recirculation plan lol.
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Old 02-28-2010, 06:41 PM k1114 is offline  
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IMFlacid
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the vent or registers as they are called are not dampers, dampers are made to throttle the airflow or shut them down completely.

the vents are more to direct the airflow, always direct them to throw on the walls, thats your biggest heat loss/gain area

it wouldnt be hard or expensive to cut into the duct that goes to that room and put in a real damper just to see what it does, and adjust it to see if it makes any noticeable difference.

a heat load calc is expensive but worth it, most contractors wont do a thorough one unless they are sure you will go though with the new equipment because its complex and time consuming. ive been in the hvac field for about 5 yrs now and i am no where near able to do that stuff.
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Old 02-28-2010, 07:09 PM IMFlacid is offline  
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