Long story short, Casati installed our AC unit incorrectly, voiding the warranty.
The details....
We noticed that the unit wasn't cooling as well as expected. When we contacted them, they said because we didn't sign up for their annual maintenance (which they didn't mention at the time, and you'll see other people on here with complaints that they cite the same excuse) they couldn't help us.
Turns out, even if we had done annual maintenance with them it wouldn't have mattered. Upon calling a different service company in, they've told us that the installers didn't change the copper when installing the new unit, which means that both connections were out of spec for the new unit. This overloaded the coil, causing it to blow and leak coolant. So in fact, it was their poor installation which caused the problem, and I now have a unit that is still in warranty period, which has been voided because they didn't follow the manufacturer's installation requirements. read more