After you file

Bingo...;.it's the AC/Heat-Window-door-roofs that don't carry.

@greatone125mb ...Some of the credit might be used even if you get a refund.

There are subtleties to that.  IF your tax liability is zero on line 47 of your Form 1040, then all of the credit carries forward to future year(s)....but if line 47 has a $$ value, then some, or all of the credit  of it might be used.  Some non-carryover non-refundable credits will be used up first, if your file has any of those.

Simplistically, if you get a refund isn't necessarily indicative of a full carryover...but if you already get a FULL refund of all your Federal pre-paid taxes and withholding...then there will likely be a full credit carryforward.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*