We purchased a new Amana Model ASZ140481 heat pump in June 2008, including a new line set and exchanger unit. There are known problems with the service valves leaking on the compressor unit, and the device has now failed for the 3rd time in less than 5 years of ownership. This most recent failure required the replacement of the entire exchanger unit inside the furnace. Were it not under warranty the cost of the repair would have been astronomical. We spent the extra dollars for a Amana thinking we were getting the best product available, -specifically so we could avoid these sorts of problems. Look elsewhere for your cooling needs, the Amana brand, like so many other once great brands, isn't what it used to be.