Last reviewed: August 24, 2026. Federal information and program status can change. State, Tribal, utility, building-code, permit, and product requirements vary by location.
A home energy assessment is most useful before the expensive decisions are made. It can show whether the uncomfortable room is mainly an air-leakage problem, a duct problem, missing insulation, solar gain, equipment performance, or some combination. It can also keep a project from hiding a water or combustion-safety problem behind new materials.
The assessment is not a promise that every recommended upgrade will pay for itself. It is a way to replace guesswork with measurements, observations, and assumptions that can be checked.
Start with the house you actually have
Before the visit, gather at least 12 months of electricity and fuel bills if they are available. Note thermostat settings, occupancy changes, rooms that are hard to heat or cool, condensation, musty odors, visible staining, ice dams, and times when equipment struggles. A single high bill is difficult to interpret without weather, rate, and household context.
Tell the assessor about planned work. An assessment for attic insulation is not identical to one used to size replacement HVAC equipment or evaluate a whole-home rebate project. If the house has an attached garage, vented crawl space, combustion appliances, fireplaces, or ducts outside conditioned space, those details belong in the scope.
What the common tests can—and cannot—show
Blower-door testing
A blower door uses a fan mounted in an exterior doorway to create a controlled pressure difference. A calibrated system measures airflow, which allows the assessor to quantify whole-house leakage under the test condition. While the fan is operating, the assessor can investigate leak paths around attic penetrations, rim joists, chases, hatches, windows, doors, and other boundaries.
The number alone does not identify every leak or decide which openings should be sealed. The result needs the home’s volume, test pressure, enclosure location, ventilation strategy, and combustion equipment context. DOE’s consumer guidance specifically calls for a calibrated blower door when a quantitative result is needed.
Infrared imaging
An infrared camera records surface-temperature patterns. Under suitable indoor-outdoor conditions, those patterns can help locate missing insulation, thermal bridges, and air movement. The image is not an X-ray and does not by itself prove that a dark or bright area is wet, uninsulated, or leaking air. Weather, sun exposure, indoor temperature, recent equipment operation, and material emissivity can all affect what appears on screen.
Infrared imaging is often more informative when coordinated with blower-door testing. Ask the report to label what was observed, the conditions during the scan, and how the assessor reached the conclusion.
Duct testing and airflow
A duct blower can measure leakage in the duct system. That matters most when supply or return ducts run through an attic, crawl space, garage, or other area outside the home’s pressure and thermal boundary. Leakage testing is different from checking whether each room receives the airflow it needs. A complete HVAC investigation may also require static-pressure measurements, temperature measurements, equipment data, filter and return-air review, and room-by-room load calculations.
Water and safety come before efficiency work
An assessment should flag roof or plumbing leaks, wet insulation, drainage problems, damaged wiring, suspect materials, blocked combustion vents, and ventilation concerns before air sealing or insulation covers them. Tightening a home changes air movement and pressure relationships. Fuel-burning equipment and exhaust fans therefore need appropriate professional attention before and after substantial enclosure work.
Do not treat a general energy assessment as a mold, asbestos, radon, structural, electrical, or code inspection unless those services are explicitly included and performed by qualified people. Each has its own methods and, in some states, licensing rules.
Ask for a report that can be used for bids
A useful report should be more than a list of products. Ask it to separate observations from estimates and include:
- the billing period, household assumptions, and known comfort or moisture complaints;
- the location of the pressure and thermal boundary;
- test equipment, test conditions, and measured results;
- photos or diagrams tied to specific findings;
- water, ventilation, electrical, and combustion-safety issues that require action;
- a recommended sequence rather than unrelated upgrades;
- the energy-price, weather, equipment-life, and behavior assumptions behind savings estimates; and
- which conditions should be retested or commissioned after the work.
Use that scope to request comparable bids. “Add attic insulation” is difficult to compare. A bid that identifies air-sealing locations, installed insulation level, clearances, ventilation protection, access treatment, photographs, and final testing is much more useful.
Sequence the work so one project does not undo another
- Stop bulk water and correct urgent hazards. Roof, plumbing, drainage, electrical, structural, and combustion problems do not become safer under new insulation.
- Define the enclosure. Decide which attic, crawl-space, wall, garage, and mechanical-room surfaces separate indoors from outdoors.
- Coordinate air sealing, insulation, and ventilation. These are parts of one moisture and indoor-air system.
- Repair and test ducts where relevant. Duct losses can change equipment and room-load decisions.
- Size HVAC after planned enclosure improvements. Reusing the old nameplate capacity is not a load calculation.
- Verify the completed work. Final testing and commissioning should match the risks and claims in the project scope.
Our insulation and air-sealing guide explains why climate, drying potential, ventilation, and combustion safety need to be considered together.
How to find an assessor without assuming independence
DOE recommends checking with electric or gas utilities and state or local energy and weatherization offices for qualified providers. Ask what certification, insurance, and local license apply; exactly which tests are included; whether the assessor also sells the recommended work; and whether the fee changes if you hire that company.
An assessor who also performs upgrades is not automatically unsuitable, but the financial relationship should be clear. Keep the original report and data so another contractor or program administrator can review the basis for the recommendations.
Payment and incentives in 2026
Current IRS guidance says the former Energy Efficient Home Improvement Credit cannot be claimed for property placed in service in 2026. Older pages describing a federal credit for a home energy audit should not be used to budget a 2026 assessment.
Utilities, state or local governments, and participating Home Energy Rebate programs may subsidize an assessment or require an approved assessment before work. DOE says federal Home Energy Rebates are available only in select jurisdictions, with rules administered locally. Confirm eligibility, assessor requirements, preapproval, and covered costs with the official administrator before ordering the assessment or signing a construction contract.
This article provides general educational information, not tax, legal, engineering, plumbing, electrical, or combustion-safety advice. Use qualified professionals where testing, permits, fuel-burning equipment, refrigerants, structural work, or electrical and plumbing changes are involved.