I am heating 1200+ square feet with 2 of these heaters, and they do a decent job. I really need a third one for the area I am heating, but these 2 took the temperature from 25 F to 55 F in a couple of hours. I am heating a 30 X 40 foot shop with no ceiling.
I haven't used this product much yet, but so far I like it. It cools my large living room quickly and it's not amy noisier than a window AC. Set up was more compicated that I hoped for - I had trim the window kit to fit, and there were gaps around it, whch I wa able to seal with some weather stripping. But otherwise I"m happy and would say it's a good unit.
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