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Energy at home Heat pumps. Advice Boilers. Advice Electric heating. Advice Biomass. Advice Solar water heating. Advice Heating controls. Advice Thermal energy stores. Advice Micro combined heat and power. Energy efficiency calculator The HACKS calculator reviews the current energy set up at your home and provides solutions to make your home more energy efficient.

Ground-source or water-source heat pumps can be used in more extreme climates than air-source heat pumps, and customer satisfaction with the systems is very high.

Absorption heat pumps, also called gas-fired heat pumps, use heat or thermal energy as their energy source. They are different from compression heat pumps that are driven by mechanical energy and can be driven with a wide variety of heat sources such as combustion of natural gas, steam solar-heated water, air or geothermal-heated water.

Absorption heat pumps are more complex and require larger units compared to compression heat pumps. The lower electricity demand of such heat pumps is related to the liquid pumping only.

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

Some 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. Although most heat pumps use electric resistance heaters as a backup for cold weather, heat pumps can also be equipped in combination with a gas furnace, sometimes referred to as a dual-fuel or hybrid system, to supplement the heat pump.

This helps solve the problem of the heat pump operating less efficiently at low temperatures and reduces its use of electricity. Mini splits are increasingly being used in situations, such as: Homes with costly electric heat e.

Older homes with no existing ductwork e. Existing homes with high fuel costs. Additions or outbuildings e. Spaces adjacent to unconditioned spaces where ductwork would be exposed to harsher temperatures e.

New, high-efficiency homes, including ENERGY STAR certified homes. Older commercial buildings with no existing ductwork for air conditioning or expansions. Where hot or cold spots exist within homes including spaces which serve as home offices.

Rooms require additional heating with a preference to reduce fossil fuel consumption from primary heating source. Buildings with an older central heating unit that would like to replace it with a whole home clean heating solution. Proper Sizing Installing properly sized HVAC equipment for your home is essential to getting the best performance and comfort.

Cold Climate Considerations Many new ENERGY STAR certified mini split models excel at providing space heating even in the coldest of climates, as they use advanced compressors and refrigerants that allow for improved low temperature performance. What else should I look for when buying a mini split?

Finding Certified Equipment Be sure to look for the ENERGY STAR when shopping for a ductless heating and cooling system Air-source heat pumps.

Installation Tips: Indoor Unit Remember that heat rises and cool air sinks, when gauging expectations for what areas of your home will receive benefits from a single wall unit.

Consider air flow. Open spaces are generally easier to cool and it can be challenging for heat to move through an open doorway, and impossible to move through a closed one. Simplify your installation process through creative placement. Outdoor Unit Plan for an outdoor location that will be least intrusive based on your home and outdoor living needs.

The right location will come at the intersection of personal aesthetic preference and home layout. Prioritize unobstructed airflow by avoiding tight placements with shrubs, structures, etc. The more air they have access to, the better they'll work. Avoid installing the outdoor unit near doors and windows.

Outdoor units release water when they defrost in the winter, which can form icy patches. Check the location related to roof runoff, and make sure the unit is equipped with a rain cap if necessary.

Consider serviceability and ease of access when selecting an installation location. SAVINGS TIPS. Additional Resources Ask the Expert: How Does a Heat Pump Work? Mini Split Heat Pump Factsheet PDF, KB.

Savings Calculator Designing Spaces: Introducing the ENERGY STAR Home Upgrade - YouTube Ask the Expert: Get Federal Tax Savings and Other Rebates for Energy Efficiency Home Upgrades. Related Products. AIR-SOURCE HEAT PUMPS.

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