This Video shows the build of a DIY Solar Heat Pump System .An air source heat pump consists of an evaporator coil, a condenser, two fans, a compressor, and plumbing lines containing a refrigerant. In simple terms, during the winter the large fan in the outdoor unit pulls cool outdoor air through the evaporator coil which causes the refrigerant inside to absorb what's called 'latent heat' from that air, and then begins to boil and evaporate . Once the refrigerant is up to temperature, it passes through the condenser coil/heat exchanger where indoor air also passes through the condenser's fins to absorb the heat from the refrigerant and deliver it where it's needed.A heat pump is essentially an air conditioner working in reverse. Instead of pumping heat from indoors to outdoors, it's pumping heat in reverse.
Watch the DIY Solar Heat Pump System Build Video