Even though I use std. deduction I thought I could still claim a small tax credit for some replacement energy saving windows using for 5695

Yes, you can claim the Home Improvement Energy Credit when taking the standard deduction.  Credits are different than deductions and whether you itemize or take the standard deduction, generally does not affect your ability to take a credit.

This means until then, the calculation may not accurate so when the form is updated you may be getting the credit.

 If you do not have a tax liability, you are not eligible for the credit as it is a non-refundable credit. See below for additional information on the Home Improvement Energy Efficient Credit. 

The Home Improvement Energy Efficient Credit

Worth up to 30% of costs with a maximum credit $2,000 for

• Air source heat pumps
• Heat Pump Water Heaters
• Biomass Stoves or Boilers
• Worth up to 30% of qualifying costs for a maximum combined total of $1,200 for the following:
  • Doors, Windows and Skylights
  • Insulation
  • Natural Gas, Oil Propane Water Heaters
  • Furnaces
  • Boilers
  • Central Air Conditioners
  • Electrical Panel Upgrades
  • Home Energy Audit (up to $150)
• You can combine the $2,000 credit with the $1,200 credit for a total of $3,200
• This credit is a is a nonrefundable credit. This means in order to claim the credit you must have a tax liability to offset it.  If you do not have a tax liability equal to the credit the credit will be reduced to match your liability or down to $0. 
•  use it or lose it credit.  If you do have enough tax liability in the year you buy and install the item, you will not be able to carry the credit forward.
• Doors, windows and insulation must be installed on your primary home.
• The home must be in the US
   

(Edited 1/29/2025 @ 12:38PM PST)  @teejaybee