The tax credit for a seer2 16 AC with gas heater unit in 2023 is 30% of the cost up to $600. If the cost is $7000, 30% of $7000 is $2100. Can the $1500 used later years?

Assume I used $600 limit in 2023. I want to know the left over $1500 is still usable later.  Or the carry over is only when I did not used up the $600 limit.