Maybe you are thinking of the Energy Efficient Home Credit
Eligible contractors use Form 8908 to claim a credit for each qualified energy efficient home sold or leased to another person during the tax year for use as a residence. The credit ($2,000 or $1,000) is based on the energy saving requirements of the home.
The credit is part of the general business credit.
Partnerships and S corporations must file this form to claim the credit. All other taxpayers aren’t required to complete or file this form if their only source for this credit is a partnership or an S corporation. Instead, they can report this credit directly on line 1p in Part III of Form 3800, General Business Credit.
