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Old 01-31-2009, 01:30 PM   #1
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HVAC - Heating my Attic Space


Remodeling an attic space in a Cape Cod home. The added space is approx 800 sqft. I currently have forced hot air in the main house, but running the ducts to second floor is not an option. Also, the current furnace won't support the added space. I was thinking electric baseboard and opening the door from first flloor. I am planning on insulating well, but trying to determine my best options for heating. Electric heat is expensive.

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Old 01-31-2009, 01:33 PM   #2
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HVAC - Heating my Attic Space


Do you need air conditioning up there as well? There are minisplit units that work as heat pumps as well. Expensive but require no ductwork and are ideal for retrofits/single areas. For info only, don't know this guy.
http://www.minisplitsystems.com/


Last edited by yuri; 01-31-2009 at 01:35 PM.
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Old 01-31-2009, 02:01 PM   #3
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I was planning on using a window unit for my a/c needs, although I am open to suggestions.
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Old 01-31-2009, 02:35 PM   #4
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HVAC - Heating my Attic Space


Are you sure it won't support the space?
Did you do a heat loss calc?
We have a Cape that is 1250 1st floor, maybe 800 2nd floor
Only 1 radiator on the 2nds floor in a small bedroom
But the furnace is actually oversized based on a heat loss calc

I'm not planning on adding any hot water heat upstairs
There won't be a door, so cold air will flow down the stairs
I will add electric radiant floor heat in the new steam/shower bathroom. Since these are bedrooms I don't need a lot of heat up there. AT present with the existing door closed it stays about 45 without sheetrock & missing some insulation

I built a 14k AC into one wall & have 3 venting skylights
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Old 01-31-2009, 04:10 PM   #5
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My heating guy said the furnace won't support, but I still won't be able to run the ducts. I too don't need a lot of heat since it will be used primarily for a master bedroom. Just want to see options outside using baseboard.
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Old 01-31-2009, 06:41 PM   #6
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HVAC - Heating my Attic Space


Pro's and Cons:
Window units can be noisy, I wouldn't want one in my bedroom.
Electric baseboard heat is simple and never breaks down.
Mini splits are good but they may need expensive repairs in the future.Initial cost is high.
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Old 01-31-2009, 09:08 PM   #7
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Quote:
Originally Posted by Vermont1 View Post
My heating guy said the furnace won't support, but I still won't be able to run the ducts. I too don't need a lot of heat since it will be used primarily for a master bedroom. Just want to see options outside using baseboard.
My heat guy said the same thing about my furnace
Turns out my furnace is almost 2x the size needed for my house & will heat my entire addition - almost 2x the space

Did he run a Manual J Calc?
Do you know what model you have, someone here may be able to confirm approx sizing
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Old 02-01-2009, 07:46 AM   #8
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HVAC - Heating my Attic Space


Thanks for the replies. Scuba Dave, I really didn't persue because running the ducts is not a viable option. Thanks

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