A home energy audit is the fastest way to find out why your electricity bill is higher than it should be, and whether fixing the problem will cost less than switching plans.
Texas households often focus on the rate they pay per kilowatt-hour. That matters. But if a house is losing conditioned air through gaps in the envelope, running an oversized or undersized HVAC system, or heating water inefficiently, no plan on the market will fully solve the problem. An audit identifies those losses precisely so repairs can be targeted and cost-justified.
What a Home Energy Audit Actually Examines
The term covers a range of services, from a free utility walkthrough to a full diagnostic inspection that takes half a day and costs several hundred dollars. What they share is a systematic look at where energy enters and leaves the home.
A comprehensive home energy audit typically covers:
- The building envelope. Walls, attic, floors, windows, and doors are checked for air leakage and insulation gaps. A blower door test depressurizes the house and makes infiltration points visible.
- Heating and cooling equipment. The auditor checks whether the HVAC system is sized correctly, measures duct leakage, and records the equipment's age and condition.
- Water heating. Water heating accounts for roughly 18 percent of home energy use nationally, according to the U.S. Energy Information Administration (EIA). An auditor notes tank age, insulation, and thermostat setting.
- Lighting and appliances. Older refrigerators, incandescent fixtures, and always-on devices (sometimes called phantom loads) are catalogued.
- Utility bill history. Most auditors ask for 12 months of billing data to spot seasonal patterns that reveal equipment or envelope problems.
At the end, the auditor produces a prioritized list of improvements with estimated costs and projected savings. That list is the deliverable that matters.
Types of Energy Audits for a House
Not every situation calls for the most thorough inspection available. Understanding the tiers helps a homeowner spend the right amount.
Utility or basic walkthrough. Several Texas utilities and retail electric providers offer no-cost or low-cost basic audits, sometimes conducted remotely using billing data and a homeowner questionnaire. These are useful for identifying obvious problems but do not include diagnostic equipment like blower doors or duct pressurization tests.
DIY audit. ENERGY STAR and the Department of Energy publish free checklists a homeowner can complete in an afternoon. A careful DIY audit surfaces insulation gaps, drafty windows, and inefficient appliances. It cannot measure air infiltration rates or duct leakage quantitatively.
Professional diagnostic audit. A certified home energy auditor uses a blower door, an infrared (thermal) camera, and duct pressurization equipment to measure the house's actual performance. This is the standard that produces reliable savings estimates. The Building Performance Institute (BPI) and RESNET both certify auditors to defined competency standards.
Whole-house performance contract. Some companies bundle the audit with the improvement work, pricing the audit at low or no cost if the homeowner contracts for weatherization or HVAC upgrades. This can be a reasonable deal if the recommended work is competitive; it also creates an obvious conflict of interest worth acknowledging before signing.
Home Energy Audit Cost
Professional home energy audit costs vary by region, house size, and the depth of diagnostics requested. Nationally, the typical range runs from $200 to $600 for a single-family home, with larger or older homes at the upper end. Some Texas programs subsidize or fully cover the cost.
Two resources worth checking before paying full price:
- Texas-administered weatherization programs. Income-qualifying households can receive free audits and improvements through the Texas Weatherization Assistance Program, administered by the Texas Department of Housing and Community Affairs.
- Oncor, AEP Texas, and CenterPoint Energy each run efficiency programs that pay incentives to approved service providers, who discount qualifying weatherization and HVAC work for customers in their service territories; audit fees themselves are generally not covered. Program terms change annually; current details are on each utility's website.
- Federal tax credits (expired). The Inflation Reduction Act credit that covered 30 percent of a home energy audit, up to $150, was terminated for property placed in service after December 31, 2025, so a 2026 audit earns no federal credit. A tax professional can confirm eligibility for work completed earlier.
When evaluating whether the cost is worthwhile, the calculation is straightforward: if an audit costs $400 and the recommended improvements reduce annual electricity consumption by 15 percent, the payback period depends on how much the household spends on electricity each year. A household spending $2,400 annually saves $360 per year at that reduction rate, paying back the audit cost in roughly 13 months before counting the cost of any improvements themselves.
How to Find a Qualified Home Energy Auditor
Credentials matter because the quality of the report depends on the methodology. Two certifications are widely recognized:
- BPI Building Analyst. The Building Performance Institute's core certification covers house-as-a-system diagnostic methodology. Since 2023 it has been issued in two levels, Building Analyst Technician and Building Analyst Professional, and BPI also certifies specialty areas including heating/cooling.
- RESNET HERS Rater. The Residential Energy Services Network trains and certifies raters who use the Home Energy Rating System, the same index used by new-home builders to demonstrate code compliance. A HERS rater can produce a score that benchmarks the home against a standard reference house.
Both organizations maintain searchable contractor directories on their websites. Asking for sample reports and checking references before hiring is reasonable due diligence.
What to Do With the Results
The report is only useful if it informs action. A well-written audit report ranks improvements by cost-effectiveness, meaning the ratio of projected annual savings to installation cost. Air sealing and insulation consistently rank near the top because the materials are inexpensive relative to the energy they save. HVAC replacement ranks lower because equipment costs are high, though it becomes more urgent when existing equipment is failing or dramatically undersized.
A useful frame for prioritizing:
- Fix air sealing and insulation first. These improvements reduce load on every piece of equipment in the house.
- Address duct leakage. Duct systems in unconditioned attics or crawl spaces can lose 20 to 30 percent of conditioned air before it reaches living spaces, according to ENERGY STAR.
- Upgrade equipment when the economics justify it. A heat pump replacing a gas furnace in Texas's mild winters often pencils out well, though the federal tax credit that supported heat pump purchases ended for property placed in service after December 31, 2025.
- Change habits and settings last. Thermostat setpoints, hot water temperature, and refrigerator settings are free to adjust and should be addressed before spending money on hardware.
When an Audit Matters More Than a Plan Switch
In the Texas deregulated market, shopping plans is one way to reduce electricity costs. Among plans listed on Choose My Power as of November 2, 2026, the gap between the cheapest listed plan (6.6 cents per kilowatt-hour all-in at 1,000 kWh, from APGE's SimpleSaver 9) and the median listed rate (14.8 cents per kilowatt-hour) is substantial. Switching from a median-priced plan to a well-priced one saves real money.
But switching plans does not reduce consumption. A household using 1,800 kWh per month because of a poorly insulated attic in a Texas summer will pay less per unit on a competitive plan, and still pay a large bill. An audit that leads to meaningful consumption reduction compounds the benefit of every plan decision afterward.
The two strategies are not in competition. A household that audits first, makes targeted improvements, and then shops plans on a lower consumption baseline gets the full benefit of both moves.
The Bottom Line
A home energy audit is a diagnostic tool, not a product. Its value is proportional to the accuracy of the diagnosis and the quality of the follow-through. For Texas households with older homes, high summer bills, or comfort problems that persist despite plan switches, a professional audit from a BPI or RESNET-certified home energy auditor is likely the highest-return single step available. For newer, well-insulated homes with efficient equipment, a free utility walkthrough or careful DIY checklist may be sufficient to confirm there are no major losses worth pursuing.