EVI Air Source Heat Pump 1.-25 DC low temp, EVI design 2.Cop to 4 ... the system can provide stable running in even -20 DC environment, avoid any antifreeze problem.Compare to the common ... split design, can install inside the house in cold area to provide stable running and avoid any anfifreeze ... ); } )(); heat pump(evi air to water,low temp, -25 DC, split, CE, EN14511-2:2011, EN14511-2:2007, NFPAC, EURO ...