Oil-filled radiator heaters are the most efficient heaters. A small one is around $80. However, 120sq ft is pretty small for an oil-filled heater - they can heat much larger spaces. So such a heater will hardly be on very much to heat that room.

My advice is to use a Ranco or Johnson ON/OFF controller as a safety in case the on-board thermostat on the heater should fail. Especially in a small room like that.

Just for comparison, I have an outdoor insulated shed that is closer to 100 sq ft. I use a $25 portable ceramic room heater set on half-wattage, and that alone keeps the shed around 75 deg being on a miniscule amount of time during the day (outside temp has been 50-65 deg). I can get the shed to 80 plus easily -I just choose not to.

My shed is pretty well insulated, so it probably matches more closely to a closet inside a house.

Ceramic room heaters smell like they are burining for a few weeks of use, and then gradually produce less odor (alot like RHPs). I advise if using one to let it run for an hour a day for a week or so before putting it inside a closet to reduce the odor generated.
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Mark

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• the big temperature dilemna revisited - robeyeshua221, Sat Nov 6 11:04:53 2010
• RE: the big temperature dilemna revisited - Bigtattoo, Sat Nov 6 12:44:56 2010
• RE: the big temperature dilemna revisited - markg, Mon Nov 8 12:08:12 2010