How to Read a Home Energy Audit Report: A Homeowner's Guide

You scheduled the audit, the technician spent two hours poking around your attic and basement, and now you are staring at a twelve page PDF full of blower door numbers, thermal images, and efficiency ratings. Most homeowners skim the summary page, feel vaguely guilty about their attic insulation, and then file the report away without acting on it. That is a costly mistake. A home energy audit typically costs between $300 and $500, but the report it produces is the single best roadmap you will ever get for cutting utility bills, improving comfort, and prioritizing repairs that actually matter. Learning how to read a home energy audit report turns a confusing stack of data into a clear, ranked to do list, and it helps you ask contractors the right questions when you start collecting quotes.

This guide walks through the report section by section, explains what the measurements actually mean, and shows you how to translate findings into a prioritized plan. Along the way, you will see where professional repairs are non negotiable, which upgrades deliver the fastest payback, and how to use the audit as leverage when you request bids from local contractors.

Start With the Summary Page, Then Work Backward

Almost every audit report opens with an executive summary, and this is where you should spend your first ten minutes. The summary usually lists the auditor's top recommendations in priority order, along with estimated costs, estimated annual savings, and a simple payback period for each measure. Pay attention to the order: auditors are trained to sequence improvements so that one measure does not undermine another. For example, air sealing almost always comes before adding insulation, because sealing gaps after insulating means tearing into the work you just paid for.

As you read the summary, separate recommendations into three mental buckets: health and safety items, structural or moisture issues, and efficiency upgrades. Health and safety findings, such as a backdrafting water heater or a gas leak, jump to the front of the line regardless of cost. Moisture problems, like a wet crawlspace or roof leak feeding attic mold, also demand immediate attention because efficiency work done on top of moisture damage will fail. Only after those two buckets are handled should you start comparing the payback periods on insulation, windows, and equipment upgrades.

One caution: the savings figures in the summary are estimates, not guarantees. They are typically modeled using local utility rates and average weather data. Treat them as a ranking tool, not a promise, and plan to verify actual results against your utility bills after the work is done.

Decoding the Blower Door Test Results

The blower door test is the backbone of any serious energy audit, and its results appear in a section usually titled Air Infiltration or Building Tightness. During the test, a calibrated fan mounts in an exterior doorway and depressurizes the house to a standard pressure difference of 50 pascals, roughly the suction you would feel in a strong wind. The fan's airflow, measured in cubic feet per minute (CFM), tells the auditor how leaky your building envelope is. That number is then divided by the home's conditioned volume to produce the air changes per hour at 50 pascals, written as ACH50.

Here is how to interpret the ACH50 number on your report:

• 3 ACH50 or lower: A tight, modern envelope, typical of recent construction or a home that has been professionally air sealed.
• 4 to 6 ACH50: Moderately leaky, common in homes built in the 1990s and 2000s. Targeted air sealing can still help.
• 7 to 10 ACH50: Leaky, typical of older homes with unsealed penetrations, recessed lights, and drafty rim joists.
• Above 10 ACH50: Very leaky. Air sealing should be the first upgrade on your list, often before insulation.

The report should also include the auditor's estimate of your natural infiltration rate, which is the air changes per hour under normal weather conditions. That figure feeds directly into the heating and cooling load calculations later in the report, so a leaky house will show inflated equipment sizing recommendations. This matters when you get HVAC quotes: a contractor who sizes a new furnace based on leaky house numbers may install equipment that is too large once you air seal and insulate. If the report recommends both envelope work and a new HVAC system, ask the auditor whether the equipment sizing was modeled on the pre upgrade or post upgrade envelope.

Reading Thermal Imaging and Where the Leaks Actually Are

Thermal imaging produces the most visually striking pages of the report, and also the most misunderstood. An infrared camera shows surface temperature differences, not air movement directly. A dark blue patch on an interior wall in winter usually means that area is colder than surrounding surfaces, which could indicate missing insulation, a hidden air leak, or moisture. The auditor's interpretation, printed alongside each image, is what matters. Good reports annotate each photo with the location, the likely cause, and a recommended fix.

When you review the thermal images, group the findings by location rather than by photo. You will typically see clusters in four zones: the attic hatch and rim joists, the basement or crawlspace ceiling, exterior wall outlets and penetrations, and window and door frames. Clusters tell you where a single air sealing visit will pay off the most. If the report shows eight separate leaks around recessed ceiling lights, that is one afternoon of work with foam gaskets and caulk, not eight separate projects.

Watch for images that suggest moisture rather than air leakage. A cold streak running down a wall or a dark patch near a chimney is a red flag for water intrusion or condensation, and the report should flag it as such. These findings should be handed to a qualified professional for inspection before any insulation or air sealing work proceeds, because trapping moisture inside an assembly leads to mold and rot. When you are ready to line up that inspection, you can use a service like FreeQuotes.Contractors to request bids from pre vetted local pros and compare them side by side.

Translating Scores Into a Prioritized Upgrade List

Many reports include a Home Energy Score or a similar rating, often on a 1 to 10 scale, with an estimated score improvement for each recommended measure. The score itself is less important than the delta: the report is telling you which upgrades move the needle most. Build your priority list using three filters in this order: safety, cost effectiveness, and sequencing.

Cost effectiveness is usually expressed as simple payback, the upgrade cost divided by annual savings. A $600 air sealing job that saves $180 per year pays back in about three years, which is excellent. A $9,000 window replacement that saves $250 per year pays back in 36 years, which is poor, even though new windows improve comfort and curb appeal. Neither number is wrong; they simply serve different goals. Use payback to rank efficiency spending, and use comfort, aesthetics, and resale value to justify everything else.

Sequencing matters just as much. A practical order for most homes looks like this:

1. Fix health, safety, and moisture problems first (combustion venting, mold, roof leaks, crawlspace water).
2. Air seal the attic floor, rim joists, and major penetrations.
3. Add or replace insulation in the attic, walls, and crawlspace as the report recommends.
4. Upgrade heating and cooling equipment only after the envelope work is complete.
5. Address windows and doors last, especially if they are functional and the payback is weak.

This sequence protects your investment. Insulating before sealing traps air leaks inside the insulation, and replacing a furnace before sealing means the new unit is oversized for the tightened house. If your budget only covers one phase this year, do the air sealing and attic insulation, then revisit the rest after a full heating and cooling season.

Which Findings Justify Immediate Professional Repair

Not everything in the report is an efficiency suggestion. Some findings are active hazards, and the report should call them out in language like safety concern, immediate attention, or recommend further evaluation. Treat these as stop signs, not suggestions.

The most common urgent findings include:

• Combustion safety failures: A water heater or furnace that backdrafts flue gases into the home, or a measured carbon monoxide level above safe thresholds.
• Gas leaks: Even small ones detected at pipe joints or appliance connections.
• Moisture intrusion: Active roof leaks, crawlspace standing water, or elevated wood moisture readings that risk rot and mold.
• Exposed or unsafe wiring: Knob and tube wiring buried in insulation, or unsecured connections found during the attic inspection.
• Structural concerns: Sagging roof sheathing, compromised framing, or failed flashing around chimneys and skylights.

These items belong in the hands of licensed professionals, and quickly. A backdrafting water heater is a carbon monoxide risk, not a comfort issue, and no amount of insulation fixes it. Similarly, a wet crawlspace needs drainage and vapor barrier work before anyone installs floor insulation, or you will be paying to insulate a swamp. If the report flags any of these, schedule the repair evaluation before you spend a dollar on efficiency upgrades, and keep the auditor's documentation; it is useful when you brief the repair contractor.

Questions to Ask the Auditor Before You Sign Off

The audit is not finished when the technician hands you the report. Most programs include a walkthrough or phone consultation, and this is your chance to convert data into a plan. Come prepared with specific questions, and take notes on the answers.

Ask which recommendations the auditor would do first if this were their own home and the budget were limited to $2,000. Ask how the savings estimates were modeled, including which utility rates and weather assumptions were used, so you understand the margin of error. Ask whether any findings require a licensed specialist, such as an electrician, roofer, or HVAC technician, and whether the auditor can refer one. Ask how the recommendations interact: will air sealing change the equipment sizing, and does the insulation advice assume the moisture problem is fixed first? Finally, ask about rebates and incentives. Many utilities and states offer rebates for audit recommended work, and a good auditor knows which programs apply to your address. For a broader look at available credits, see this guide on what a home energy efficiency tax credit covers, and bring the specifics to your auditor so the plan accounts for them.

If the auditor cannot answer these questions clearly, or the report lacks photos, measurements, and a prioritized list, ask for a revised report. You paid for documentation, and a vague two page summary does not meet the standard of a professional audit.

Turning Audit Recommendations Into Contractor Quotes

The final step is where most homeowners lose momentum: converting recommendations into bids. The audit report is your specification sheet. When you request quotes for air sealing and insulation, attach the relevant report pages so every contractor bids on the same scope. This eliminates the apples to oranges problem where one bid covers attic air sealing and another only blows insulation.

For each recommended measure, request at least three quotes and ask each contractor to itemize labor, materials, and any diagnostic testing included. Air sealing and insulation work should include a post installation blower door test to verify results, and that test should appear as a line item. For HVAC replacements, ask whether the contractor performed a Manual J load calculation based on the post upgrade envelope, not the leaky pre audit numbers. For roofing or moisture repairs flagged in the report, ask for photos of the affected area and a written scope that matches the auditor's findings.

Keep the audit report on file even after the work is done. If a contractor's results fall short of the modeled savings, the report gives you a baseline for a conversation, and it is also useful documentation if you sell the home or apply for rebates. Homeowners who treat the audit as a one time read and file it away miss most of its value. Those who use it as a project roadmap, quote by quote, tend to get the comfort improvements and bill reductions the report promised, often for less money than they expected because the prioritization kept them from overspending on low return items.

Reading an energy audit report well is really an exercise in triage: fix the hazards, seal and insulate in the right order, replace equipment only when the envelope is ready, and save the cosmetic upgrades for last. Do that, and the report stops being paperwork and starts being the most useful home improvement document you own.