In December of 2015, I had a new home A/C and furnace system installed. I wrote the check to the installer in January of 2016 for the job.
I just found out that in December of 2015, congress extended tax credits for energy efficiency improvements to the end of 2016 (including retroactively applying them to any 2015 purchases). I've (obviously) already filed my 2015 taxes, and I did not claim this credit since I was unaware. However, my new system is energy efficient enough to make me eligible.
Question: Can I claim this credit on my 2016 taxes since I didn't claim it in 2015? If not, do I need to amend my 2015 tax returns to get the credit? Is it worth it?
Instructions for the IRS form are here, if that helps: https://www.irs.gov/instructions/i5695/ch01.html#d0e53
I've scoured the IRS, and Energy Star sites, but I haven't been able to get a clear answer.