I purchased 2 Shinco 12,000 btu units. The first one needed a repair to the outdoor control board. The turn around time for the board was one day. The units now works great. The second unit just died with a E4 error code and also a red light on the indoor display. I will call GT today but the above information is very valuable. The bottom line is that I paid $719 each for the units and after my cost for installation and using the tax credit they cost me less than $350 each. I cannot complain.