There is a huge variety of heat pumps available in the market, but you should always carefully consider some factors before purchasing one. You should first decide the size of the pump you intend to buy. The prices vary according to the number of additional features available, like an attached water heater etc. The type of the pump and its quality should also be given equal importance. And off course, you should always settle for a reputed brand, for the optimum after sales heat pump services and a suitable product warranty.