Hello! I am doing my grandparents taxes and this past year they had a new TRANE installed and on the invoice it says it qualifies for the 1500$ tax credit. I am using Turbo Tax. When I get to the upgrade page regarding things and inputting how much was spent (5,898.00)it keeps not giving me a window to input the code on the invoice. When I called the company they said to put in the code but there is no where I am seeing to put it. Any help would be great-my grandparents are really hoping to see this credit. Thanks