This heater is great. Today is quite cold in Upstate NY and my furnace has been kicking on a lot, so I decided to set up my new heater. Since turning it on an hour ago, my furnace has yet to kick on again. I’ve got an open floor plan in a ranch style house. The heat throughout the home seems to be staying nice  even. When I purchased this model, I chose it because it said it was energy efficient.Upon receiving it, there’s no mention on the box or included paperwork that it is. With that being said, it’s still a great unit!