Most U.S. homes are heated by natural gas, particularly in the Midwest and Northeast. Over 80% are heated by warm-air furnaces which range in efficiency from 80% to 98% AFUE. Recently, higher efficiency “condensing” models have saturated the market, particularly in Northern states, and shifting federal standards will further drive adoption of “condensing efficiency” heating equipment. Looking ahead, an emerging class of gas-fired heat pumps could continue this drive towards high-efficiency gas heating. The authors review findings from a recent development and demonstration of a residential-scale gas heat pump (GHP) for space heating, including results from laboratory and field evaluations.
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