We had an American Standard Heritage 13 heat pump installed about 3 1/2 years ago. It replaced a one ton unit for our small home. They installed a much larger 16 seer unit and there was little difference in our comfort, but 'hey' our original unit served us since 1994 and all things go bad and need replaced. We were satisfied to put the $4,200 on our home equity line of credit for the newer unit. 2 weeks ago it wasn't cooling as well so we called the installer, Johnson & Johnson Heating and Air Conditioning from Martinsburg wv. He determined it was a bad expansion valve, and the parts were still covered under warranty. The part was $360 but was conveniently offset with the cost of refrigerant leaving me with a whopping bill almost $650. what a rip off. a 3 1/2 year old unit has a valve go bad and we have to pay a bill like this. They should cover the cost of the refrigerant also because their faulty valve caused it to leak out. I'm terrified to think of what's down the line for this new bigger unit! The repairman said these expansion valves go bad all the time as if $650 is an expected cost of ownership. I said next time I'll get a trane and he told me they were the same thing. I don't know who I can trust.