He forgot to hook up a wire during installation. So for 5 years, our heat and AC blew out on low speed. Obviously, it didn't heat and cool like it should and I complained about that. Foster couldn't find anything wrong. Probably thought I was imagining things. To be fair, another tech or two didn't find anything wrong, either, but they weren't the one who did the faulty installation. Finally, somebody who really knew what they were doing found the problem but unfortunately after running on low speed caused a $600 problem. Don't remember exactly what that was. Of course, this happened a few months after warranty expired. Entire unit now will have to be replaced a good bit ahead of what it should be, probably since the old underground lines were used instead of running a new line overhead like it should have been done with R-410a and also the vacuum/clearing out the old line obviously wasn't done very well. Would never use Fosters again. Do what you want.
