Ditto the other's observations... The thermostat seems to register the temperature of the unit itself rather than the room... I had the thing in a 63 degree room, had it set to 85 degrees. It would register 90 after 30 seconds of running, turn off, slowly ramp back down to 84 degrees over a 2 minute time period, and then repeat. The temperature of the room never got above 64 degrees....