Heat Pumps 101

Heat pumps offer homeowners year-round comfort and unparalleled efficiency.

This guide covers how heat pumps work and what makes them so efficient and useful in any climate.

Parts of a Heat Pump

Split into two parts, the system contains an outdoor unit that looks similar to an air conditioner and an indoor air handler. Your heat pump, in conjunction with the air handler, distributes the conditioned air into the rooms of your home.

At first glance, a central heat pump system looks similar to a traditional forced-air setup, but there is one major exception—the furnace is gone. In its place is an air handler that includes a blower fan and an evaporator coil. Rather than using a gas furnace that burns fossil fuels, the heat pump uses an outdoor condenser for both heating and cooling.

How Does a Heat Pump Work

Summer Mode (Cooling)

In the summer, the heat pump acts as an air conditioner:

• The compressor creates a hot, high-pressure gas.
• The outdoor coil (condenser) releases heat and condenses the refrigerant into a liquid.
• The expansion valve drops the refrigerant pressure.
• The indoor coil (evaporator) absorbs heat and collects moisture, providing essential dehumidification for the home.

Winter Mode (Heating)

In the winter, a reversing valve reroutes the refrigerant path:

• The outside coil becomes the evaporator, absorbing heat from the outside air.
• The indoor coil becomes the condenser, releasing the captured heat inside to warm the home's air.

Tackling the Complex: The Defrost Cycle

In cold conditions, the outdoor coil must operate at a temperature lower than the outside air to absorb heat, which can lead to frost accumulation. The specialized defrost cycle manages this:

• Switching Flow: The reversing valve briefly switches the refrigerant path back to the cooling (summer) mode.
• Melting the Frost: This transfers indoor heat to the outside coil to melt the frost.
• Auxiliary Support: To prevent cold air from entering the home during this time, auxiliary heat is automatically activated for the duration of the cycle.

This ensures the system is quickly frost-free and back to efficient heating, providing reliable home comfort.

Heat Pump Inverter Efficiency

Heat pumps are popular thanks to their comfort, energy efficiency, and the potential for cost savings. The source of this efficiency is often inverter technology.

An inverter is a "smarter" type of motor with a built-in computer capable of variable speeds to drive the compressor. This allows the system to:

• Continually adjust the power according to the exact temperature needed.
• Run longer at lower, steadier speeds, resulting in significantly lower electrical consumption compared to older, single-speed units.

Application Flexibility: Maximizing Comfort in Any Climate

One of the greatest benefits of the heat pump is its application flexibility. Whether you are in a warm or cold region, a heat pump can be tailored to meet your needs:

Hybrid Systems for Colder Climates

In colder regions, a heat pump can work alongside a gas furnace to maximize comfort and efficiency. This combination creates a hybrid heating system. The heat pump handles heating during milder spring and autumn temperatures, while the furnace takes over during the coldest winter days when the heat pump becomes less efficient. The heat pump acts like the “Goldilocks” of HVAC, keeping your home comfortable through the changing seasons.

Year-Round Comfort in Warmer Climates

In warmer climates, the heat pump works in conjunction with the air handler to provide maximum efficiency in warming and cooling your home.

Ready to explore heat pump options for your home? Shop heat pumps at Ferguson.com or connect with an expert to find the right system for your climate and comfort needs.