I have now had a third compressor malfunction on my Hydro-Temp unit since we moved into our house July 1, 2011. Anyone who would like can reference my 2 previous posts from 8-31-11 and 11-14-11. In summary, we have a 6-ton Hydro-Temp unit that was installed shortly before we moved into a new construction home near Milwaukee on 7-1-11. We had two compressors fail on the first unit within the first 2 months. Our installer then replaced the unit in November. It did function this winter although I thought my heating bills were high. It made it through the summer and then just failed 3 days ago. It has been the 2-ton compressor that has failed all 3 times. This is a dual compressor unit with a 4-ton and 2-ton compressor. I haven't included any design details because I'm pessimistic about someone solving this problem via the forum, but let me know if you really want a crack at it. Clearly something is wrong. Does anyone have any suggestions about how to proceed? Know any experts near Milwaukee that can solve the problem? My installer is Interstate Heating and Cooling and they want to replace the compressor again -- brilliant!