Let's say you've got a reach-in cooler in a commercial kitchen that needs a compressor replaced. Do you do the repair where the cooler is, or do you take it outside if at all possible? Considering the time to do it right (recovery, clean out lines if it's a burn-out, filter drier, deep vacuum, recharging, etc.), and the fact that I don't want to be in the way for a couple hours while people are trying to cook just feet from me, I usually take it outside.
It has come back to bite me once, as the owner, no matter how hard I tried to convince him otherwise, claimed that I just did it so that I could listen to music from my van. He thought it took to long to change the evap in a 134a True cooler, but he didn't want to hear about the major evacuation because of the unit running in a vacuum and pulling in moisture (I fought for a while to get that thing to 500 microns). He told the boss that he didn't want me back in his establishment. Eeh...didn't bother me none. The boss understood.
Anyway, which do you prefer?