Mike from OR Heating came out the same day that I called and quickly diagnosed a sticking thermal expansion valve. I was interested in the tests he performed and he was happy to explain exactly what he was doing. Two days later he came out to replace the valve which is a fairly complicated and time consuming job involving evacuating the inside coils, sealing off the coolant in the outside coils and soldering in a new valve and filter followed by a complete vacuum of lines involved to avoid contamination. Then he checked for leaks and reassembled the unit. He performed a thorough job in a very professional manner and I was glad to have him working on my HVAC system.
