I don't know when you had that done, but that's sure a good price. Next month will be 3 years since I had my 13 SEER Goodman heat pump installed. Everything was new, inside and out, Freon lines, thermostat, etc. except it uses the old ductwork and of course the electric wiring to the unit. But mine cost about $6,000. And yes, it has a 10 year warranty, although I think that is from the company that installed it instead of Goodman. But several months after it was installed I also went with a maintenance agreement with the company, and yes they told me it really wasn't necessary. But I pay them $12 a month and I've never needed to call for any kind of service, but they call me each Spring and again each Fall to make an appointment to come inspect and check everything.