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• A dual-fuel system won’t save as much of your existing heating fuel compared to a full- replacement central heat pump, which eliminates use of the old fuel entirely. • If you heat with oil or propane, a full replacement heat pump is cheaper to operate than dual-fuel; with natural gas, the dual-fuel system is likely more economical for heating • If you have a relatively new furnace with an older central AC, or if you are planning to add a new central AC to the furnace, you might buy “up” to a heat pump. This creates a dual-fuel system for a modest extra cost over an AC system. • Care should be given in selecting an add-on heat pump coil that is compatible with your existing furnace. You may need to settle for a non-“cold climate” heat pump that’s compatible with your existing furnace, but it can still save significant heating fuel which a standard AC can’t.11 Ductless system: A single-zone system with a single indoor head (mounted high on the wall, low on the wall, or embedded in the ceiling) connected to a single outdoor unit. Things to consider with ductless • A ductless unit can provide heating or cooling to adjacent rooms when the rooms are in an “open plan” with large open doorways or no walls between them. But rooms with frequently closed doors will not get nearly as much heat and will run cool in the winter. • Remember there will be some room-to-room variation in temperature if using a single zone system to condition multiple rooms. If you prefer cool bedrooms in the winter, this may be ideal. • If you like every room exactly the same, it may not be the best option unless you have a separate heating zone for each bedroom. • A first-floor ductless system can add significant heat to the upstairs bedrooms as well, if there is an open stairway. • First floor units won’t provide any cooling to the second floor, and upper floor units won’t heat the first floor. If you want both heating and air conditioning in a two-story house, you’ll need at least two indoor units. • One or two ductless units may be all you need for a small house, or a very efficient (new or renovated) house. Similarly, they could be the first step in the “start small” strategy discussed on page 10. 11Additional images (p. 9 top-left, middle-left & p. 15 bottom-right) provided by Bruce Harley, Bruce Harley Energy Consulting LLC 16PDF Image | Air Source Heat Pump Buying Guide
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