I just got one of these (1500 btu) to use during the Illinois Muzzleloader Season which is two weeks after Thanksgiving. I bought the model that doesn't have the electronic ignition for $29. I started it up in the garage the other night and never heard a thing while it was running. It did burn off a little smoke but with a heaters like that it is to be expected. After 1/2 hour the smoke cleared and it worked great. Good buy in my opinion.
http://www.greatoutdoorsdepot.com/coleman-sportcat-heater.html