Recently I've come across a type of heat pump that has serious problems with invertors and compressors and are costing customers a fortune in repairs. Most people have asked me is it possible to retrfit a different heat pump to the existing dx collectors. The problematic systems have been running on propane and were I to switch it would be to 410a. What problems would I face in this scenario with oils and contamination from the propane and is it even feasible?