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beerdog 12-24-2009 07:15 PM

Heating a garage
I want to heat my garage.My utility room and furnace are right next to the garage. I also have a 2nd floor duct run that ends a few inches from the common wall. My thought is to extend it out the wall to blow heat into the garage. Is this acceptable per standard codes? Are there electric vent valves that would open when the heat turns on and close when it is off to prevent house heat from escaping to the garage?

Scuba_Dave 12-24-2009 07:19 PM

Not sure about fires codes & fumes from car when the heat is not on
That would be my concerns

tpolk 12-24-2009 08:07 PM

my guess from doing commerciall work is that your garage if attatched needs to maintain a fire rating. You will need to check with proper peeps but you could probably install a fire damper at the wall seperation. I don't know if it will fly because of fumes like dave noted

Marty S. 12-24-2009 08:07 PM

Garage can't share the same system as the house.

firehawkmph 12-24-2009 08:53 PM

What Marty says. I agree. Get yourself a separate unit. Many different ways to go on this.
Mike Hawkins:)

vsheetz 12-24-2009 11:38 PM

When I finished off our attached garage into a hobby room I installed a terminal package unit - a unit like you see installed under the windows in hotel rooms.

Heat via heat pump, A/C, and a thermostat on the other side of the area. Works great. Mine is GE brand - several other vendors have similar. Highest capacity unit available. I paid about $1000 for the unit landed - including through the mounting wall sleeve, thermostat, etc. Mounted high in the wall opposite the house side - easy install.

I also like it has freeze and overheat protection - even if turned off at the thermostat, it kicks on heat at 40 degrees and A/C at 80 degrees.

beenthere 12-25-2009 05:45 AM

Code prohibits a garage from being heated or cooled by the same duct system as the home.

Must have its own system, if the home has a forced air system.

beerdog 12-25-2009 07:02 AM

Sounds good. I have been looking at different gas based units. I afriend has a house furnace from a tear-out that I can get for 50$. Installationwouldn't even cost me anything. Juts not sure if I want to take up the floor space.

beenthere 12-25-2009 07:07 AM

In a garage install. No motor, control or burner(they are points/sources of ignition) may be within 18" of the floor(by code). So you need a pedestal for it to sit on, to keep the motor and usually control board high enough.

gregzoll 12-25-2009 09:45 AM

One of the lady's from my church, has a old furnace that acts like a NG space heater. My BIL uses in floor geo-thermal heating over a pre-stressed slab that has the coils on it, then a poured slab on top. Depending on when you are going to be in the space, a portable Jet heater may be the best bet. Insulate the walls, seal any air leaks, and it should be fine to keep the cold from freezing the space.

Marty S. 12-25-2009 10:54 AM

My detached garage just has two electric space heaters. Only time they're on is when I'm working on something out there.

beerdog 12-25-2009 09:53 PM

I just drywalled and insulated the garage. Still have a little bit more to install in the attic space. The residual heat from the house keeps it OK. So far it it has not gotten below 38f. I have a kerosene heater but that only gets it to 45-50along with that smell and the extra moisture. I want a nice, dry, 65f....even in January.

firehawkmph 12-25-2009 10:05 PM

I heat my garage and separate shop with direct vent gas furnaces. They mount right to the wall and vent right through. I only turn them on when I need to. They have a two speed blower and blow the heat out the lower part of the unit.

My shop is 26' x 28'. I can heat it in the dead of winter in about twenty minutes or less and be out there in a t-shirt. The other thing about this type of heater is that the combustion chamber is sealed off from the inside of the garage. So you don't have to worry about gas fumes or anything like that igniting.
Mike Hawkins:)

Red Squirrel 12-26-2009 03:37 AM

Probably not as much heat and speed as the gas heaters, but for something very easy and DIY friendly (no gas lines to run) is you can buy 240V electric heaters. A couple of these might work.

This looks interesting too, though a heater mounted on a ceiling seems kinda inefficient, but if you have really good insulation I suppose it might work.

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