Please note: Heat function is intended to provide supplemental heating in addition to an existing heat source. For more product details, please see owner/install manual. Durastar Through-the-Wall heating and cooling units, formerly Koldfront, offer a sleek, easy to install, room air solution to upgrade your comfort without compromising window or floor space. These units feature a digital display, three-fan speed, 24-hour timer, and remote control for a user-friendly experience. Product Technologies: