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Old 09-02-2010, 06:54 AM   #1
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Heating Options & Sizing Duct Work

I am designing/crunching budget numbers on building an addition off my 1955 Cape. Currently my house is 24x32 w/finished attic and unfinished basement. I have an older Lennox forced air furnace in the house that does a decent job. My addition will be a 2-stall 24x32 garage with a full second floor, connected via a 8x12 breezeway.

Through the use of attic trusses on the breezeway I will have a hallway from the current finished attic over the breezeway into the second floor addition above the garage.

This addition will have (2) bedrooms, master bedroom w/walk-in closet, and a full bath.

I have been pondering heating options for awhile now and can't seem to figure out which will be the most cost effective in the long run.

-Electric Baseboard heating is the cheapest to install, and easiest to size for the room.. but electric service is expensive.
-Natural Gas boiler is an option, but the rest of the heating system is expensive and requires quite a bit of plumbing.
-Natural Gas forced air sounds like the way to go... basically adding a second furnace to my house just for the addition.

What is the best way to go about sizing duct work? I have attached a layout view of the second floor of the addition to give you an idea of how the rooms are laid out.

Was thinking the furnace could be located in one of the closet areas in the breezeway attic. Or I could create a utility closet if needed.

16" Deep iJoists run left to right 16" OC.

Any other ideas would greatly be appreciated.


BowDown is offline   Reply With Quote
Old 09-02-2010, 04:46 PM   #2
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Should do a heat load to find out how much heat you'll need. And what size A/C if your going to install it.

probably can use a little 40,000 BTU gas hot air furnace.


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