Gas Heat Systems are Split Systems which consist of the outdoor heat pump or air conditioner, the indoor cased evaporator coil and the natural gas furnace. Sold by default as a vertical, upflow configuration. Please ensure this is the correct configuration for you or specify at time of purchase if you need horizontal or downflow option. Many furnaces are designed for multi-position installation, while coils may not be. Furnace is convertible to liquid propane (LP) fuel with conversion kit (sold separately). Check the manufacturer product specifications to determine compatibility for your needs. Please consult with your licensed HVAC contractor to ensure system is correct for your installation. This listing is for the product only. Installation is not included.