A split system furnace is a type of heating system that is composed of two parts: an outdoor condensing unit and an indoor air handler. The outdoor condensing unit contains the compressor, condenser coil, and expansion valve, while the indoor air handler contains the evaporator coil, blower, and air filter. Together, these two components work to provide efficient, cost-effective heating for your home. The condensing unit is responsible for extracting heat from the air outside and transferring it to the refrigerant inside the unit. The refrigerant is then compressed and sent to the indoor air handler, where it is heated and distributed throughout the home. The air handler also filters the air, removing dust and other particles from the air before it is circulated. Split system furnaces are known for their energy efficiency, as they are able to heat a home without wasting energy. They are also relatively quiet and require minimal maintenance, making them a great choice for many homeowners.