The 25C tax credit (25C refers to the relevant section of the IRS tax code) allows you to take a federal tax credit equaling 30% of the total cost for a variety of energy efficiency home upgrades, including qualifying insulation and air sealing expenses. There is an annual maximum credit of $1,200 for the category of upgrades that includes insulation.
Attic insulation, wall insulation, basement insulation, and crawl space insulation all qualify for the credit, as do many different types of insulation materials, as long as certain insulation levels are met. Mountain West Spray Foam & Insulation will work with you to ensure that your insulation work is eligible.