Instruct: Classify Amazon reviews into positive or negative sentiment
Query: excellent heater, JUNK Thermostat

I would give 5 stars for the heater, but the included thermostat is JUNK, and Mr. Heater, a long-respected company, is shooting themselves in the foot with this t-stat. Installed in my Denver garage ( 650 sqft), anf it heats very efficiently, but the t-stat, set at 35deg, heats garage to constant 50+ degrees, so I wasted a huge amount of gas trying to just keep things from freezing in the garage until I replaced it, so I recommend not even using their t-stat, but having a quality part handy when you install it. Otherwise, it's a great heater, may even consider one in LP for our mountain cabin.