I replaced attic insulation in 2022. Orkin has refused to give me a breakdown of materials versus labor. Since only materials count, any ideas on the tax credit? Thanks.

I recommend you determine the type of insulation that was installed, and then do a little research to determine what the cost of those materials are.  You can then determine what a reasonable cost for those materials would be (based on the area where the insulation was installed) and use that amount to calculate the credit.  Be sure to document your research.  Here is a link for a list of Certified Insulation Products.