Heat pumps are refrigeration- cycle devices that use electricity to move and concentrate heat energy and can be used for both heating and cooling. Although electricity is required to run a compressor ,the energy needed to deliver a given quantity of heat with a heat pump is typically a fraction of what it would take to provide the same amount of heat with resistance baseboard heaters or wall-hung units.
Ductless heat pumps deliver cooled or heated air with one or more indoor fan-coil units. For this home’s single-zone system, the surface-mounted indoor unit has been placed in a central area of the living space to distribute the conditioned air as widely as possible.
Unlike most hvac equipment, which cycles on and off as a thermostat calls for heating or cooling, inverter-driven ductless heat pumps ordinarily run continuously, adjusting their output as needed to maintain a constant indoor temperature. A remote supplied with each indoor unit controls temperature, blower speed, and the position of the vent louvers.
Although indoor units are most often mounted high on a wall, some models are designed to be concealed in a soffit as shown above.
Stubs for refrigerant lines, a condensate drain, and an electric line pass through a hole in the exterior wall. The 2-9/16-inch hole is later filled with canned closed-cell foam and waterproofed with caulk.
Concrete riser blocks — which elevate the outdoor unit to provide drainage — are fastened to the pad with construction adhesive.
If no suitable position for a ground mount is available, the unit can be wall-mounted on a manufactured bracket.