Comment the pay depends ... (Score 2) 509
I have an ex-roommate who does refrigeration repair
He's on-call every couple of weeks, and might have to drive an hour away to fix a chiller at a grocery store; if they can't get to it and get it repaired before it warms up too much, they might have to destroy thousands of dollars worth of food. (and if you to go and get parts, you're kinda screwed) I don't think it's quite as bad as the 'always on duty' as some sysadmins get stuck with, but it can be much more stressful than you'd expect.
I also don't know if it's quite as steady work, even with the 'can't be shipped overseas' argument; my
understanding is that with the slowdown of new home construction, there's an oversupply of pipefitters, so companies aren't necessarily hiring. (this might vary by city).