Heating advise

Old 02-11-10, 03:34 PM
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Heating advise

So Ive been renovating my house and now im down to replacing the forced air heating system. As it stands it only heat the downstairs and as you would guess the heat travels up and heats the upstairs quite well.

the house was built in 1955. 2 story raised floor home 1870 sqft originally flat roof in 00' we put on a pitched metal roof and insulated it. I live in Juneau AK.

I would like to replace the heating system with either radiant floor heat or baseboard heat.
my crawlspace is about 4' so working down there is easy.

my question is which is more energy efficient and since the house house now heats very well with forced air only blowing downstairs can i expect the same performance from radiant or baseboard heat?

Im going to be environmentally sealing the crawl space and insulating the walls down there as well as adding a french drain around the inside with a sump pump. before this is done a french drain around the exsterior is already beeing installed.

the state of AK will reimburse me up to 10k for this project so im planning on running all the plumbing myself(PEX) and then having contractor put in the furnace.

With this is mind which will be the best bang for my buck as far as cost goes both install and long term.

The forced air system is older than dirt and is a fuel hog.

Thanks for the help.
Old 02-11-10, 06:36 PM
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OK, you need to do a heat loss first for proper sizing of the boiler to maximize efficiency and know how much radiation to put in each room. Hydronic heat will need to be placed per floor. You could do radiant on the first floor and baseboard on the second if you do not have access to the underside of the floor on the second floor.
Contrary to belief heat does not rise. Hot air rises. With radiant the ceiling is cooler than four feet off the floor. You need convection currents to heat with baseboard but radiant does not create convection currents.
For more info on heat loss see the link.
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