Greetings! I live in upstate NY and it has been quite a cold winter here. We installed a ClimateMaster 4 ton unit in the summer of 2012 with glycol in a closed loop system. In January of this year, our system started to blow cold air and I had to get it repaired. At that time, the problem was that although the thermostats were calling for auxiliary heat the heat pump was not aware of that. The reason was that they were not wired correctly to the control panel (we have a 2 zone system). The contractor corrected the wiring and all was good for about 6 weeks. At that time, the EWT was 37 degrees and the LWT was 31 degrees. I asked if those temperatures were okay and I was told they were. However in mid to late February, the geothermal was blowing cold air once again. So once again I called the contractor. I was told that the geo pump was locking out as the EWT was too low (I do not remember the temperatures this time around). I was also told that pumps were quite frozen. One pump was only 30% effective and the other pump was 0% effective. We were told to wait till the temperatures were between 35 and 50 degrees for a few days before swapping out of the auxiliary electric heaters. A couple of weeks later we were above the threshold for a few days so we switched back to "normal" geo mode. All was good for about 2 weeks and then the heat pump started to blow cold air again. So now we back to auxiliary heat as of last night. Is it is a concern for the pumps to be frozen? Will this cause any problems in the loop field? Anything that can be done to help prevent his from occurring? I know that we have had a very cold winter here with average temperatures for much of Jan and Feb sometimes barely in the lower 20s and lower. Thanks for any help you can provide.