Deductions & credits

I incurred energy expenses for furnaces, hot water tank, etc. in 2018.  When doing 2018 taxes, Turbo Tax did not generate a 5695 because legislation was not approved. so on my 2019 return, I could not list the amount of energy expenses as a carryover from a 2018 5695.  I tried doing an amended 2018 return.  When I enter the energy expenses, it says my credit is zero.  However, if I try it in the 2019 software, my credit is $450.00.  I don't think it is proper to enter a 2018 expense in 2019 return unless I had a carryover from 2018 that was actually on a 2018 5695 form.  What should I do?