Posted by ss55 on March 29, 2014 at 20:45:13 from (50.81.112.224):
In Reply to: Heat pumps posted by George Marsh on March 27, 2014 at 15:48:47:
Air to air heat pumps work well when outside air temperatures above 40_F or 5_C. They are not a very good application for areas that spend much time with outdoor air temperatures continuously below freeezing. When air temperatures are below freezing air to air heat pumps need a backup system, like electrical resistance heat. A good air to air heat pump system should automatically shut down when outside air temperatures are too cold and then automatically switch on their backup system. If you friend's system did not do that automatically, then I would believe either something is wrong with his system or someone sold him a wrong system, one intended for a warmer climate. If his system is regularly cycling heat outdoors to defrost the outdoor coils, it sounds like he has the wrong system for his climate.
Geothermal heat pumps are a better application where air temperatures are below freezing for long periods of time. This winter in Minnesota we had over 50 mornings with low temperatures below zero_F and we were continuously below freezing for a 30 day stretch. Air to air heat pumps are not used here except in three season porches that are unheated in the winter. The trade-off with geothermal is much higher installation costs.
Did your friend buy his air to air heat pump from a liscenced contractor? If an HVAC contractor is installing air to air heat exchangers as far north as central Indiana, my opinion is he is cheating his customers. The contractor may be getting a lot of sales by selling uninformed or gullible customers low cost systems that the customers think will do the job, rather than doing the math to quote the higher cost heating systems that his customers really need. That's just my opinion.
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