I bought the envi 120v plug-in Electric Panel Wall Heater 500 watt 3rd Gen for a small master bedroom. We keep the pocket door to the bedroom closed most of the time so the cats don't go in there. There isn't a heating duct in the bedroom so it gets kind of cold in the winter months. This heater is mounted to the wall and doesn't take up much space at all. Now it is much warmer and obviously more comfortable. It's only been a couple of weeks or so since installation, so I'm not sure how it will impact my electric bill. I don't expect a big difference. The shipping was fast. The packaging was very good, and installation was very easy.