I do auto ac and plan on getting my home ac certificate online soon. My circa 1980, Payne heat pump needs to be topped off and I plan on doing that myself. I just have a few questions.
#1. Can I use my R12 auto gauges? Should I clean out the hoses first?
#2. Is there a trick to finding the high and low side? Are they clearly marked? On a car I have no problem.
#3. How does topping off a home ac differ from that of a car? Any tips or tricks would be greatly appreciated.