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Air-source pumps have a unit outside the home and an internal piping system that extracts heat from the outside air and moves it indoors. This type of heat pump can also be paired with an air-source hot water heat pump to provide homeowners with hot water. No matter what the temperature is outside, a heat pump can gather heat located in the ground or air outside the home. The pump takes the heat into the system, compresses it to increase the temperature of a refrigerant, then pushes the hot air into the home. When the weather gets hotter, the system reverses and acts like an air conditioner; it moves heat from inside the home and transfers it outside.
Heat pumps have some limitations regarding the outside temperatures in which they can work efficiently. Heat pumps can heat AND cool the air unlike air conditioners. Even when it comes to cooling your house down, heat pumps are more efficient compared to A/Cs. The main difference between an air-source pump and a ground-source pump is the heat source.
Lower efficiency during colder weather
Most standard heat pumps can heat at 100% capacity until the outside temperature falls to 40 degrees. Below that and the heat pump starts to “derate.” Their effectiveness declines. With a ductless heat pump, you’ll have more targeted air filtration.
Every week we write a newsletter with stories just like this. We cover every thing from home energy to electrification to climate change. Forbes Home adheres to strict editorial integrity standards. To the best of our knowledge, all content is accurate as of the date posted, though offers contained herein may no longer be available. The opinions expressed are the author’s alone and have not been provided, approved, or otherwise endorsed by our partners. For instance, most air duct lines should have dampers on them.
Heat pumps are more efficient than traditional heaters and air conditioners
On the other hand, a heat pump decreases your heating fuel bills significantly. For instance, a household using 800 gallons of oil yearly can reduce this by around 300 gallons by using a heat pump. Generally, when using a single unit heat pump (one-to-one pump) daily, your monthly electricity bill goes up by about $50 to $100.
On a cold day, a heat pump can move heat energy inside and heat your home. By using minimal energy and no gas or oil to control the comfort of your home, a ductless heat pump system would be much more efficient than a traditional furnace system. This translates into savings on your energy bill and the possibility of energy credits. Conventional gas-fueled furnaces and centralized heating and air-conditioning systems are commonplace across the country. However, these systems are inefficient, expensive and have significant environmental costs. Think of them as something Scrooge might use to heat his home.
Ductless Air-Source Heat Pumps
When the weather turns cool, the heat pump produces heat and uses the furnace to blow warm air throughout the house. In very cold weather, when the heat pump can’t extract the necessary BTUs, it automatically shuts down and the furnace kicks on. Liquid refrigerant is pumped through an expansion device at the indoor coil, which is functioning as the evaporator.
Fossil fuel costs—the main driver of inflation—are historically much more volatile than electricity costs, which are often subject to state public utility regulation. (Of course, in markets where electricity is generated using fossil fuels, the two costs are related.) As noted above, the U.S. electrical grid is already 40% run on non-fossil sources. They behave like an air conditioner, using the outside coil as an evaporator and the indoor coil as a condenser to extract the heat from outside and transfer it inside. From there, the refrigerant travels through a closed system between the indoor and outdoor units. The heat pump produces heat and uses a furnace to blow warm air throughout the ductwork in your home.
A heat pump can lower your energy cost
Check with your local HVAC dealer to learn about savings opportunities in your area. The heating and cooling mechanisms of the unit use less hazardous substances than other systems. The unit does not need a heat source since it does not generate heat but rather transfers heat from one location to another. The now warmed refrigerant is pumped outside your home to the heat pump unit, where the absorbed heat is radiated out into the outside air.
The added efficiency of a ground-source pump can, however, save money on energy costs down the line. A fan in the outdoor unit moves outside air across the coils, which are serving as condenser coils in cooling mode. Because the air outside the home is cooler than the hot compressed gas refrigerant in the coil, heat is transferred from the refrigerant to the outside air. During this process, the refrigerant condenses back to a liquid state as it cools. The warm liquid refrigerant is pumped through the system to the expansion valve at the indoor units.
These indoor units connect to water heater or space heaters. These ductless mini-split systems are useful for retrofitting a home with a heat pump system because their locations outside and inside the home are flexible. At Climate Design, we offer top-rated installation services and repairs for heat pumps that can help you manage your cooling and heating needs throughout the year.
For homes without ducts, air-source heat pumps are also available in a ductless version called amini-split heat pump. Ground-source heat pumps are not affected by atmospheric temperature variations, since the ground below the frost line remains relatively stable. Not too long ago, air-source heat pumps were not efficient enough to work in extremely cold climates. But today, there are heat pumps in Antarctica, northern Canada, and northern Europe.
The key to allowing the air-source heat pump to also cool is the reversing valve. This versatile part changes the flow of the refrigerant so the system can operate in the opposite direction. So instead of pumping heat inside your home, the heat pump releases it, just like your air conditioner does. When the refrigerant is reversed, it absorbs heat on the indoor side of the unit and flows to the outside. It's here that the heat is released, allowing the refrigerant to cool down again and flow back inside to pick up more heat. One of the most common types of heat pumps is the air-source heat pump.
A fan in the heat pump then distributes the warm air through ducts or tubes throughout a building. The fan blows outside air over the coil to begin the heat exchange process. Then, depending on if the unit is in heating or cooling mode, the coil acts as a condenser or an evaporator . A heat pump has similar operating costs to an air conditioner in the cooling season.
Home Heating Systems: Space Heaters vs Heat Pumps, Furnaces, and Ductless Mini-Splits
Despite not being a renewable energy source, as it still uses some electricity, a heat pump is significantly efficient. This means that it doesn’t consume a lot of energy to keep your home warm. This ensures that you don’t end up paying too much money for electricity bills. This refrigerant then moves to the indoor air handler, transferring the hot air to the handler. The air handler then blows the hot air into the house through the control of a thermostat.
Both the indoor and outdoor unit contain various important sub-components. Homeowners in need of a new heating or cooling system, may consider the type of climate they live in before purchasing a heat pump system. Heat pumps are more common in milder climates, where the temperature does not typically drop below freezing.
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