Unless it was a geothermal unit, there is no Federal Energy Saving Credit for that for 2018 Federal taxes.
The Feds could pass a retroactive law to allow it, but I haven't seen anything to indicate they are working on it (yet).
There's still Solar/Wind and geothermal credits
....just not the former home upgrade energy credits for insulation, windows, AC, (non-geo) Heating and the like...sorry
It was still a good idea to enter that though...some states have an energy credit, and IF..if..if your state has one, it might be applied when you eventually go thru the state taxes sections.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
