Ductless Heat Pumps

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.

The ductless heat pump unit pictured here is designed to be flush-mounted in a dropped ceiling.

This ductless heat pump is designed for floor mounting.

The mounting bracket of a wall-mounted indoor unit is screwed to the studs.

The indoor unit is mounted to the wall bracket.

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.

The outdoor unit is put in position on the risers.

The outdoor unit is fastened to the risers with Tapcon screws.

If no suitable position for a ground mount is available, the unit can be wall-mounted on a manufactured bracket.

Refrigerant lines and wiring on the exterior wall are protected with a vinyl or sheet-metal cover. Condensate drain tubes are visible at lower right.

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