We just received an infra-red heater as a gift. We set it up in the middle of three connecting rooms and turned the thermostat down to 65 degrees. The unit heats up to 1000 square feet. There's no hot heating elements and the electrical usage is supposed to be equivalent to running a clock. I cannot believe how warm it is in here. We plan to use it for zone heating and keep the heating oil bill down. Does anyone have any experience (good or bad) with these types of heaters?