The SoliTherm Progressive Series enclosure air conditioners by Seifert Systems Inc. come in 44 models, offering cooling capacities of 1,000 to 21,170 Btuh. The operating temperature range is minus 40° to 131°F. Temperature controllers are adjustable from 68° to 122° and have high temperature alarms. The units are UL listed for types 12, 4, 3R, and 4X and include integrated condensate evaporation packages for no-drip operation. Units can be powered by single- or three-phase AC at 120, 230, or 480 V at 60 Hz.