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Healthy and Safe Customizable Solutions: Ducted and Ductless ASHPs On top of being highly efficient machines with a lighter carbon footprint, heat pumps are able to filter and dehumidify air, which can improve the air quality and comfort of your home. Also, by using electricity rather than burning fossil fuels to heat your home, heat pumps help eliminate the worry of gas leaks and carbon monoxide poisoning, and can reduce the danger of potential fires or explosion. The two main types of air source heat pumps, ducted and ductless, each have hundreds of models available on the market today. This means there are thousands of system configurations (a “configuration” is a specific arrangement of outdoor and indoor unit types) for all different types of home layouts. Ducted and ductless heat pumps can be custom-designed, mixed, and matched to meet your home’s heating and cooling needs.6 Ducted Heat Pumps (left) use your home’s existing ductwork (or new ducts if needed) to disperse heated or cooled air throughout your home. The unit is connected with an outdoor compressor, and replaces a traditional central system like a furnace, or a furnace with AC. Many ducted heat pumps are centrally ducted systems that serve many rooms or an entire house. A variant of ducted systems known as “compact-ducted” uses much smaller air handlers that usually serve two to four rooms. Ductless Heat Pumps (right), are often called “mini-split” heat pumps. A ductless unit or “head” is easier to install where there is no existing ductwork, and typically serves one room or area of a house. Ductless heads are usually mounted high on the wall as shown, but versions are also available to mount low on the wall, or embedded in the ceiling. Single vs. Multi Zone A single-zone heat pump pairs one outdoor unit with one indoor unit. The most common single-zone configuration for ASHPs is the “ductless mini-split” shown to the right, but single-zone systems can also be ducted. A home can have several, separate single-zone systems. A “multi-zone” configuration is a single outdoor unit paired with two or more indoor units, to accommodate multiple indoor areas or “zones”. Multi-zone configurations can include multiple ducted or ductless units, or a mix of both. 6 Photos p. 8 & p. 17 top-right taken from Mitsubishi Heating & Cooling Illustration Gallery, used with permission from Mitsubishi Electric Trane HVAC US LLC, 2019 8PDF Image | Air Source Heat Pump Buying Guide
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