1997. Approx 9 years. ;-)
I don't recall what was it, but something else has already been repaired on that unit. Could have been the compressor, which apparently wasn't as expensive at *that* time.
The office there had a smaller Whirlpool reverse-cycle unit installed at the same time, 1997. The compressor on it was replaced under warranty. Then it went out again, out of warranty, so the unit was replaced with a strip-heat model, this would be ~3 years ago. The reverse-cycle unit was of (what seemed to be) better quality overall. The 'new' unit now is developing a bad fan motor. After running for a while it starts chattering/rattling/squeaking. I pulled it for a look, sealed motor, interestingly labeled LG.
Years ago, in 1984, I bought a small Friedrich unit for my grandmother's spare bedroom when I stayed there during the long work-weekends. It hasn't had heavy use, and was pulled and stored in her garage when my sister bought a small heat/cool unit (which she doesn't use either because she prefers to sleep in the other smaller bedroom at back of the house). Anyway, when her main kitchen unit died a couple years ago, I hauled out the Friedrich and installed it in the living room for a few days until I got the kitchen unit replaced. That little Friedrich fired right up.