Posted by welled deers on March 27, 2014 at 19:33:11 from (69.168.250.166):
In Reply to: Heat pumps posted by George Marsh on March 27, 2014 at 15:48:47:
Here we go again! You need to be clear that you are talking about air source. Air source is only recommended to be used down to temps of about 20 degrees before switching to a backup. After that their efficiency falls off. The installer should know that. I am aware of several installations here in central Minnesota that are used in that way with excellent results. They are used to provide very efficient air conditioning and heat on warmer days while a backup system is used for colder days. Is that cost effective? Don’t know, but the owners like the arrangement. To condemn all geothermal when you are only presenting Air Source facts is unfair. As I have stated in earlier posts I heat a 5000 square foot house with ground source heat Pump. This past February was my most expensive month ever and my heat pump cost $110.10 in energy. It normally runs $50/60 a month. I do have a backup system, but it has been turned off for the past 10 years. Have never needed it. I did have three independent heat loss calculations done on my home and based on those numbers the pay back for the additional Geo costs were less than 5 years compared to propane, oil or electric baseboard. My pump has been in operation for 13 years with no problems. A neighbor has had his for 28 years with no problems. The person that installed my system installs about 25 units a year and I just talked to him. He has never had to replace a unit. The main moving part is the compressor which is easy to replace if needed. No worse than a commercial refrigerator. Geothermal correctly installed and used is very cost effective and I wouldn’t have anything else.
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