ClimateMaster’s Tranquility 22 Digital (TZ) Series geothermal heat pump system incorporates a two-stage compressor, EnergyStar tier 3 efficiency, a variable-speed fan, communicating digital controls and true “plug-and-play” functionality. It also offers one of the industry’s smallest footprints, making it suitable for installation in confined spaces. The Tranquility 22 Digital system is available in vertical and horizontal configurations in 024k, 030k, 036k, 042k, 048k, and 060k Btuh capacities.