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A comment on Heat pumps of the 1800s are becoming the technology of the future. Parent comment

Re:Heat pumps of the 1800s are becoming the technology of th... by timbit42 on Monday January 16, 2023 @10:29PM (#34408812)
10 years ago the average heat pump had a CoP of 3. Today they are 4 or a bit higher. Some ground source heat pumps have a CoP over 5. I saw one unit with 5.3. Of course, with a ground source heat pump, you can actually get that CoP when the outside air is -50C.
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