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NEEP cold climate ASHP database
Anybody have opinions about the Northeast Energy Efficiency Partnerships' cold climate air source heat pump database
? Is it to be trusted? I'm mostly interested in the efficiency of the system at low temperatures. There seem to be some strange anomalies, such as systems that have the same COP at every temperature but the HSPF is different, or AHRI # 10514711
where the maximum BTU/hr is 102,000 for a unit rated 64,000. Sometimes the COP is higher at minimum power, sometimes at maximum power, and sometimes there seems to be little correspondence between the rated quantities and the minimum and maximum quantities.
Naively I would think it would be a lot better to get something rated HSPF 12 instead of HSPF 10, but now I wonder whether this database is really accurate enough to make such comparisons meaningful.