... cooling.Goldsun uses the most advanced low Temp Enhanced Vapour Injection compressor technology and have successfully produced the EVI low ... to 34% additional heating.Reliable Components1. Hitachi EVI Scroll Compressor.2. Throttle type : Amerson Alco Thermal Expansion Valve3. Four-way ... to water,low temp, -25 DC, split, CE, EN14511-2:2011, EN14511-2:2007, NFPAC, EURO-VENT, ENERGY-STAR, DOE,ETL)