Delta cabinet air conditioners use active compressor-based cooling to keep internal enclosure temperatures below ambient. These A/C units take advantage of Delta's high quality fan engineering and inverter compressor design for enhanced performance with low noise and vibration. A variety of sizes and options are available up to 6,000 BTU's with supply voltages 48VDC and 230VAC. Operating temperature range -10°C to 55°C. UL, cUL, CE, TUV approved.