Heat Pumps

For climates with moderate heating and cooling needs, heat pumps offer an energy-efficient alternative to furnaces and
air conditioners. Like your refrigerator, heat pumps use electricity to move heat from a cool space to a warm space,
making the cool space cooler and the warm space warmer. During the heating season, heat pumps move heat from the
cool outdoors into your warm house and during the cooling season, heat pumps move heat from your cool house into the
warm outdoors. Because they move heat rather than generate heat, heat pumps can provide equivalent space
conditioning at as little as one quarter of the cost of operating conventional heating or cooling appliances.

The most common type of heat pump is the air-source heat pump, which transfers heat between your house and the
outside air. If you heat with electricity, a heat pump can trim the amount of electricity you use for heating by as much as
30% to 40%. High-efficiency heat pumps also dehumidify better than standard central air conditioners, resulting in less
energy usage and more cooling comfort in summer months. However, the efficiency of most air-source heat pumps as a
heat source drops dramatically at low temperatures, generally making them unsuitable for cold climates, although there
are systems that can overcome the problem.

For homes without ducts, air-source heat pumps are also available in a ductless version called a mini-split heat pump. In
addition, a special type of air-source heat pump called a "reverse cycle chiller" generates hot and cold water rather than
air, allowing it to be used with radiant floor heating systems in heating mode.


A number of innovations are improving the performance of heat pumps.

Unlike standard compressors that can only operate at full capacity, two-speed compressors allow heat pumps to
operate close to the heating or cooling capacity needed at any particular moment. This saves large amounts of
electrical energy and reduces compressor wear. Two-speed heat pumps also work well with zone control systems. Zone
control systems, often found in larger homes, use automatic dampers to allow the heat pump to keep different rooms at
different temperatures.

Some models of heat pumps are equipped with variable-speed or dual-speed motors on their indoor fans (blowers),
outdoor fans, or both. The variable-speed controls for these fans attempt to keep the air moving at a comfortable
velocity, minimizing cool drafts and maximizing electrical savings. It also minimizes the noise from the blower running at
full speed.

Many high-efficiency heat pumps are equipped with a desuperheater, which recovers waste heat from the heat pump's
cooling mode and uses it to heat water. A desuperheater-equipped heat pump can heat water 2 to 3 times more
efficiently than an ordinary electric water heater.

Another advance in heat pump technology is the scroll compressor, which consists of two spiral-shaped scrolls. One
remains stationary, while the other orbits around it, compressing the refrigerant by forcing it into increasingly smaller
areas. Compared to the typical piston compressors, scroll compressors have a longer operating life and are quieter.
According to some reports, heat pumps with scroll compressors provide 10° to 15°F (5.6° to 8.3°C) warmer air when in
the heating mode, compared to existing heat pumps with piston compressors.

Although most heat pumps use electric resistance heaters as a backup for cold weather, heat pumps can also be
equipped with burners to supplement the heat pump. Back-up burners help solve the problem of the heat pump
delivering relatively cool air during cold weather and reduces its use of electricity. There are few heat pump
manufacturers that incorporate both types of heat supply in one box, so these configurations are often two smaller, side-
by-side, standard systems sharing the same ductwork. The combustion fuel half of the system could be propane, natural
gas, oil, or even coal and wood.

In comparison with a combustion fuel-fired furnace or standard heat pump alone, this type of system is also economical.
Actual energy savings depend on the relative costs of the combustion fuel relative to electricity.
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