I am going to install a heat pump to replace electric baseboard heat and window air conditioners. I really want to go with the Carrier 25VNA036 "Greenspeed" system. I have read some posts that suggest to not go with a brand new system the first year introduced. While at the dealers offices, I also spoke with a Carrier Factory Rep, and he stated that the technology of this unit was not new, and Carrier has tested this unit for some time. I am new to heat pumps, so my question is " Based upon your past workings with Carrier, how well/how fast do they respond to fixing "bugs/deficiencies" in the "new" systems. Your response is appreciated.