The cheapest place to buy insulation for most homeowners is either a big box store with a promotion or a local building materials wholesaler if you can buy in bulk. For retail DIY projects, Home Depot and Lowe's consistently offer the lowest prices on common fiberglass batts like Owens Corning Pink and Johns Manville ComfortTherm, especially during spring and fall insulation sales and when they offer free blower machine rental with purchase of 10 or more bags of blown-in insulation. The free blower program is the cheapest way to insulate an attic to R38 to R60, costing only $0.60 to $1.00 per square foot in materials. For contractors or large jobs, local supply houses like ABC Supply, 84 Lumber, Carter Lumber, or IDI Distributors are often 10 to 20 percent cheaper than Home Depot because they sell by the pallet and have lower overhead. Online marketplaces like Amazon are usually not cheaper due to high shipping costs for bulky insulation, but specialty online retailers like Insulation4Less can beat local prices for rigid foam boards and mineral wool. The absolute cheapest effective cost comes from utility rebate programs. Many electric companies offer $200 to $1000 rebates for adding attic insulation, plus federal tax credits under the Inflation Reduction Act, which can cover 10 to 30 percent of the cost. Check your utility's website and energystar.gov for rebates before buying.
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