In addition to the Comfortmaker brand, IPC makes air conditioning systems, heat pumps and furnaces under the Heil, Tempstar, Arcoaire, Day & Night and KeepRite; the company also once produced products under the Airquest, and Lincoln brands. Comfortmaker highlights among its air conditioners and heat pumps such features as the Observer Communicating System to turn individual units into a cohesive system; 2-stage scroll compressors that add to the overall quiet operation; and durable, corrosion-resistant casing. Top tier units reach up to 19 SEER. Gas furnaces such as the SoftSound include similar features as the cooling units. This top-of-the-line system also offers modulating heat for more consistent temperatures and a variable speed blower to help keep indoor air quality high and moisture low. This unit reaches up to 97 percent efficiency. Entry-level furnaces also are available.