Home Energy Audit Cost: $212–$698 (Average $400) in 2026

How much does a home energy audit cost?

Most homeowners pay $212 to $698 for a home energy audit, averaging around $400 nationally (HomeGuide), though the headline averages reported across sources range from $250 (Fixr) up to $437 (HomeAdvisor, Angi). Priced per square foot, expect $0.08 to $0.50 depending on how deep the audit goes (HomeAdvisor, Fixr). The full spread across every source runs from $80 for a bare-bones walkthrough up to $2,400 or more for a large home getting a full multi-test workup (Angi, HomeAdvisor, Fixr). Two things drive most of that spread: how much square footage the auditor has to cover, and how many diagnostic tests are layered onto the visit — a simple visual inspection costs far less than a visit that adds a blower door test, duct testing, and an infrared scan. Auditor certification matters too: a HERS-rated assessment alone runs $150 to $800+ (HomeGuide), and additional certifications can add roughly $200 more (HomeAdvisor).

What’s the difference between a basic walkthrough, a blower door test, and a thermal imaging audit?

The type of audit you book explains most of the price difference. A basic walkthrough — the auditor inspects the home visually with no specialized equipment — costs $100 to $250 (Angi, HomeGuide). Add a blower door test, which uses a calibrated fan to depressurize the house and reveal exactly where air is leaking, and the bill runs $100 to $450 (Angi, HomeGuide, Fixr); HomeAdvisor prices that test alone at a flat $350. On a This Old House project, energy auditor Jordan reported the reading straight off the equipment: “We just completed our test, and we’re at 3.8 ACH50.” Add thermal or infrared imaging, where the auditor scans walls, ceilings, and windows with an infrared camera to spot missing insulation and hidden leaks, and that adds $150 to $500 (Angi, HomeGuide, Fixr), or a flat $200 on its own (HomeAdvisor). Book a comprehensive audit that bundles several of these diagnostic tests together, and the total runs $400 to $1,000 (Angi, HomeGuide). Most professional audits combine at least a walkthrough with a blower door test; thermal imaging is often an add-on.

Can you get a free or subsidized energy audit?

Frequently, yes. Four independent sources — Angi, Fixr, Thumbtack, and This Old House — confirm that many utility companies and local governments offer free or discounted energy audits to their customers, and Angi cites subsidized audits priced as low as $0. It’s worth checking with your utility provider before paying for a private audit, since a subsidized visit often covers the same basic walkthrough and blower door test a paid auditor would run. On taxes: the federal 25C Energy Efficient Home Improvement Credit covered 30% of a home energy audit’s cost, up to a $150 maximum, but per ENERGY STAR (U.S. Department of Energy) that credit only applied to audits conducted between January 1, 2023 and December 31, 2025. The IRS confirms this directly: the credit “applies to improvements made through December 31, 2025” (IRS, guidance last reviewed April 28, 2026). As of this writing in 2026, the credit has expired, so audits performed this year won’t qualify for it — factor that in if you were counting on offsetting the cost with a tax credit.

How do you lower the cost of a home energy audit?

• Ask your utility company first. Many offer a free or heavily discounted basic audit, which can bring your out-of-pocket cost to $0 (Angi, Fixr, Thumbtack, This Old House).
• Start with a basic walkthrough instead of a full diagnostic workup if you just want a general read on where you’re losing energy — it runs $100 to $250 versus $400 to $1,000 for a comprehensive audit (Angi, HomeGuide).
• Skip add-on tests you don’t need. A blower door test and thermal imaging each add $100 to $500 on top of a basic visit (Angi, HomeGuide, Fixr) — worth it if you suspect air leaks or insulation gaps, less useful for a newer, well-sealed home.
• Compare per-square-foot and flat-fee quotes. Some auditors price by square footage ($0.08 to $0.50 per sq ft) while others quote a flat rate by audit tier — get both types of quotes to see which is cheaper for your home size (HomeAdvisor, Fixr).
• Ask about local rebate programs in addition to your utility, since coverage and eligibility vary significantly by region and provider.

Prices vary by region, home size, and how many diagnostic tests you add, so treat the figures above as a planning budget. Confirm with any auditor which tests are included before booking, and check with your utility first — a free or subsidized audit can cover most of what a paid one would.