Home Energy Improvement Credit

I've entered amounts for home energy improvements, but it is showing as 0 Home Energy Credit Summary page.

I've answered:

  • Yes we made improvements
  • Yes we live in the same house
  • House in in the US
  • House is our main house
  • Improvements weren't related to construction
  • We made no improvements prior to 2108
  • We did not receive a credit in a prior year
  • We do not have a carryover

I don't know why the improvements are being disallowed.