initial symptom is freezing pipe leading to outside unit. gauged pressure and was at 75 which is good. register is blowing around 60 deg. but was told pipe freezing means coils is freezing too. i have a attic trane system and was quoted $700(that was the cheapest i found) to just clean it since they said the unit was upside down/hard to get to. id rather brake it and then have it replaced before i just dished the $$ out. i just need detailed info on what needs to be done from A to Z i know i need to properly dispose of r22 in system and then remove coil but do i just cut the lines and then do new welds/solders? proceed to cleaning with what? put back together and just use torch to solder llines back? vacuum system? then what? is there a particular sequence for charging? and on high or low side? thanksin advance for your help victor

I had a Carrier Weathermaker 8000 2-Speed gas furnace installed in my attic 5 years ago. I let the contractor talk me out of going with the variable speed model and am disappointed with the result. I have friends that have since gone w/ variable and realized much more even heating/cooling and much quieter operation, humidity control, etc. My home faces South w/ large windows and in the winter and summer I cook on the South side and freeze on the North. I am now at the point where both outside units (we have 2 systems) are going and I'm looking at definite replacement of both outside units and the basement furnace (15 years old). I might also replace the 5 year old Weathermaker 8000 2-speed just to go with a variable model in the attic at the same time, but am wondering if there is a way to convert it to variable speed (maybe a different fan and/or control module?) before I send it packing... Thanks!