I just bought a rental TH and had nothing but trouble with the AC. At first it had blockage due to contracter not cleaning the copper lines before putting the freon. Later my AC tech cleared the blockage and put a filter on the inside copper line into the coil. He also put a new capacitor and a part that should jump start it. This is an old 2 ton R22 unit. Yesterday the AC stopped again but because the condensor locked and was not turning on. My tech is now telling me that I need to replace the out side AC unit. He recommends that I put in another R22 with 13 seer with 5 year warranty since this is a rental unit. This way he could remove the freon and put it back into the new AC and also keep the same coil. I told him that this will be a long term property for me and I also may need to change the old furnace by next year. I don't want to learn later that my new furnace will not work with the AC or if the AC R22 is not good. Please help me making the right decision since I already put so much money into buying this place and trying to repair the old AC unit. Should I stay with R22, keep the coil and not to worry about problems? Or should I pay more to get an R410, change the coil and have a longer warranty on the compressor (10y)? Will this make sense for a rental townhouse or is it too much money for a rental investment? Please help.