Home HVAC cost?

ProjectBazza said

My fathers 35+ year old Rheem condensing unit finally bit the bullet a few weeks ago. Built like a friggin' tank, and he kept that sucker clean! But everything dies eventually....

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Oops, mine is a Heil unit. I need to wash it out. The fins are partially plugged. The kids in the family that lived here before us wrote their names in the coil fins and it took me 2 or 3 fin comes to try to straighten the fins out. I got most of them straight but not all. I am surprised it works as well as it does.
It's an old R22 system.