Hi Dave,
I've had a few friends heat garages and/or outbuildings with oil-filled space heaters. The type that look like an old radiator heater. I've used these myself to heat indoor snake rooms or outdoor rodent houses.
The garages or outbuildings were all insulated, but they were also in climates with severe winters. So I think the comparison is applicable.
BTW, these are the safest way to heat a room outside of a typical furnace. Even safer than baseboard heaters often used in basements.
A tip with these space heaters. Run them off of an auxillary thermostat rated to handle wattages well in excess of the heaters max output. Plug a multi-strip outlet into the thermostat and then plug your heater AND a box fan into the multi-strip. What will happen is the fan will turn on whenever the heater is turned on, distributing the heat around the room. When the thermostat cycles the heater off, the fan will turn off.
Some people just have the fan turned on all the time and don't route it through the thermostat. This if fine but I like to use the sound of the fan as a barometer of how often the heater is cycling on and off.
Another thing I've done is to plug a red or blue light bulb into the multi-strip. On those super cold days where you're worried about your animals you can often just peek out of a window and see the illuminated light through a window on your outbuilding. A nice way to provide peace of mind when you don't feel like trudging through the cold weather to check on everything. Maybe not a problem where you live.
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I need to heat an uninsulated shed. Which heaters are most cost effective? The shed is constructed of plywood with a concrete floor. 3/4 drywall on the inside. I is divided into 2 10' x 10' rooms. I'm in So. Cal. so the temps don't get super cold. Can someone suggest the type, size, and btu's of a heater that would be appropriate? (I know i should insulate the room but that won't happen till next summer) Any suggestions would be appreciated.
Thanks,
Dave