Hello, Stanislaw K, you wrote: SK> Hello, Ops, you wrote: SK>>> Practically for any model additional "whale", for operation is on sale at the under temperatures. Ops>> it for cooling (yes, it sometimes is required also in the winter), heating of a drainage and the compressor. For heating this dial-up does not help from a word absolutely. SK> It for location heating. SK> on fingers, it is figurative: the Thermal pump works transferring heat between spaces. If on the one hand the heat exchanger heats up, with another is cooled. At location cooling, the street heat exchanger (a drainage and ) heats up naturally, heat transferred of a location - does not subside a condensate - problems are not present. SK> Taking away from air of street space, giving heat to a location, street it is cooled below air temperature, on it subsides a condensate and its efficiency fatally falls. For recovery of efficiency the heat exchanger (and ) needs to be thawed a drainage. For location heating at the negative external temperatures warmly to carry there is nothing. The heat carrier does not evaporate, a reptile. Ops correctly all wrote. The winter whale is intended for operation in the winter on cooling.