Best Home Energy Audits in Michigan: 2026 Guide

Last updated: April 2026

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Michigan winters don't play around. When January drops to single digits and stays there for weeks, your home's thermal envelope becomes the single biggest factor in your energy bill. And most Michigan homes weren't built for the standards we have now.

The state sits primarily in Climate Zones 5A and 6A — some of the coldest residential zones in the country. Heating degree days in the Upper Peninsula exceed 8,000 annually, and even the southern Lower Peninsula racks up 6,000–7,000 (NOAA, 2025). That means furnaces run hard from October through April, and every gap in insulation, every leaky window frame, every unsealed rim joist bleeds money straight into the atmosphere.

Here's the thing most homeowners miss: Michigan's housing stock is old. According to the U.S. Census American Community Survey, 58% of Michigan homes were built before 1980 (ACS, 2023) — before meaningful energy codes existed. These homes were designed when natural gas was cheap and insulation was an afterthought. A professional energy audit is the fastest path to understanding exactly where your money goes and what to fix first. This guide covers what a Michigan audit includes, who the best auditors are, what you'll pay, which rebates can offset the cost, and how to get maximum value from the process.

What Does a Home Energy Audit Actually Include in Michigan?

A real energy audit — not the utility walk-through where someone swaps your lightbulbs and leaves a pamphlet — follows BPI (Building Performance Institute) or RESNET (Residential Energy Services Network) protocols. Michigan auditors working through Home Performance with ENERGY STAR or the MiHER program adhere to DOE standards requiring specific diagnostic testing. Here's what a comprehensive Level 2 audit covers in a Michigan home.

Blower Door Testing

A calibrated fan mounts in your front door and depressurizes the house to 50 Pascals. The auditor measures air changes per hour (ACH50) to quantify how leaky your building envelope is. The 2024 IECC target for new construction in Climate Zone 5 is 3.0 ACH50. Most Michigan homes built before 1990 test between 8 and 18 ACH50 — meaning the entire volume of air inside the house is replaced 8 to 18 times per hour under test conditions.

The Department of Energy estimates that air leakage accounts for 25–30% of residential heating and cooling energy use (DOE, 2024). In Michigan, where heating dominates the energy bill for six-plus months, that leakage translates to $400–$800 per year in wasted natural gas alone.

Balloon-frame construction — common in Michigan homes from the early 1900s through the 1950s — is particularly problematic. The wall cavities connect directly to the attic, creating a chimney effect that pulls heated air straight up and out. A blower door test exposes this in minutes.

Infrared Thermography

Thermal imaging cameras reveal what's happening behind your walls, ceilings, and floors without tearing anything apart. Missing insulation, thermal bridges at framing members, moisture intrusion from ice dams — all of it shows up as color differentials on the scan.

Michigan homes from the 1940s through 1970s are notorious for inconsistent wall insulation. Builders often filled some cavities and left others empty, or used thin rock wool batts that have settled and compressed over decades. Ice dam damage, common throughout the state's heavy snow belt, often goes undetected behind finished walls until a thermal scan reveals the moisture signature.

Infrared imaging works best when there's at least a 20°F temperature difference between inside and outside — which means a Michigan winter audit often produces the most revealing scans. February in Grand Rapids gives you a 50°F+ differential. That's diagnostic gold.

Duct Leakage Testing

Using a Duct Blaster, the auditor pressurizes your duct system and measures how much conditioned air escapes before reaching your living spaces. The national average for duct leakage is 20–30% of total airflow (ENERGY STAR, 2024). Michigan homes with ductwork running through unconditioned basements — which is most of them — frequently hit the high end of that range.

When your basement sits at 45°F in January and your furnace pushes 120°F air through sheet metal with gaps at every joint, the math is ugly. Sealing ducts with mastic is one of the highest-ROI fixes an auditor will recommend. For a step-by-step walkthrough, see our DIY duct mastic sealing guide.

Combustion Safety Testing

Michigan runs on natural gas for the majority of home heating. According to the U.S. Census American Community Survey, 77% of Michigan households heat with natural gas (ACS, 2023) — one of the highest rates in the nation. That means most homes have furnaces, water heaters, or boilers that burn fuel and produce combustion byproducts.

BPI requires combustion safety testing as part of any comprehensive audit. The auditor checks for carbon monoxide spillage, draft pressure, gas leak detection, and proper venting. This is a safety issue, not just an efficiency one. Backdrafting furnaces and water heaters are a genuine hazard, especially in tightly sealed homes where exhaust fans can create negative pressure and reverse chimney draft.

Energy Modeling and Prioritized Recommendations

After field testing, the auditor builds an energy model of your home. This model predicts annual energy consumption by end use (heating, cooling, water heating, baseload), identifies the biggest loss pathways, and ranks improvement recommendations by cost-effectiveness and payback period.

Good auditors sequence the fixes. Air sealing before insulation. Insulation before HVAC replacement (because better insulation means you can downsize your furnace). Duct sealing before any of it if the ducts are in bad shape. The report becomes a multi-year improvement roadmap. A professional audit catches problems a DIY assessment simply can't — the instrumentation alone costs $10,000+ to assemble.

How Much Does a Home Energy Audit Cost in Michigan?

Michigan audit pricing reflects the state's moderate labor costs and a growing pool of certified auditors, driven partly by MiHER program demand. Here's what you'll actually pay in 2026:

Several factors shape Michigan pricing:

Regional variation is real. Metro Detroit and Ann Arbor audits tend to run $50–$100 higher than those in Lansing, Grand Rapids, or the Traverse City area. The Upper Peninsula is a mixed bag — fewer auditors mean less competition, but lower cost of living balances it somewhat.

Home size drives cost. The median Michigan home is 1,600 sq ft (Census, 2024), but plenty of suburban homes in Oakland County, the Grand Rapids suburbs, and the Traverse City area run 2,500–3,500 sq ft. Larger homes take longer to test and model, pushing costs toward the upper range.

Basement complexity adds time. Michigan's ubiquitous basements add diagnostic time. A finished basement with concealed ductwork and insulated walls takes longer to evaluate than an open unfinished space. Some auditors charge a $50–$100 surcharge for complex basements.

"Michigan homeowners are sitting on some of the best energy audit ROI in the country," says Michael Blasnik, a building science researcher who has analyzed data from over 100,000 residential energy audits nationwide. "The combination of cold climate, old housing stock, and generous rebate programs means the payback period on a comprehensive audit is often under six months."

According to HomeAdvisor's 2025 data, the national average for a professional home energy audit runs $200–$425. Michigan falls near the middle of that range, with the statewide average sitting around $325 for a comprehensive Level 2 assessment (HomeAdvisor, 2025). DTE Energy's service territory tends to skew slightly higher due to metro Detroit labor rates.

What Are the Best Energy Audit Programs and Rebates in Michigan?

This is where Michigan homeowners have a real advantage. The state has layered federal, state, and utility incentives that can eliminate most or all of the cost of an audit — and dramatically reduce the cost of recommended upgrades.

Michigan Home Energy Rebates (MiHER)

Administered by EGLE (Michigan Department of Environment, Great Lakes, and Energy), the MiHER program launched its statewide rollout in early 2025 and is now fully operational. It includes two separate rebate tracks (Michigan.gov, 2025):

Home Efficiency Rebates (HOMES): Up to $20,000 in rebates for whole-home energy efficiency improvements. The rebate amount depends on measured energy savings — the more your upgrades reduce energy consumption, the higher the rebate. A qualified home energy assessment is required to establish a baseline and verify savings.

Home Electrification and Appliance Rebates (HEAR): Up to $14,000 in rebates for specific electrification upgrades. Maximum rebate amounts include:

• $8,000 for a heat pump (heating and cooling)
• $1,750 for a heat pump water heater
• $1,600 for insulation, air sealing, and ventilation
• $2,500 for electric wiring upgrades
• $840 for an electric stove or dryer

Income-based tiers matter. Enhanced rebates (covering up to 100% of costs) are available for households earning 80% or below area median income. Standard rebates (covering a smaller percentage) are available for households earning 81%–150% AMI. Households above 150% AMI may still qualify for the HOMES program based on measured savings.

Across both programs, a Michigan household can access up to $34,000 in combined rebates — among the most generous packages in the country.

Federal IRA Tax Credits (Section 25C)

The Inflation Reduction Act provides a $150 tax credit for a home energy audit performed by a qualified auditor (IRS, 2024). This is a direct credit, not a deduction — it reduces your tax bill dollar for dollar. The audit must meet DOE requirements and be performed by a certified home energy auditor. This credit stacks on top of Michigan-specific incentives.

Beyond the audit credit, Section 25C provides up to $3,200/year in credits for energy-efficient home improvements, including:

• 30% of the cost of insulation and air sealing materials (up to $1,200/year)
• 30% of the cost of a heat pump (up to $2,000/year)
• 30% of the cost of a high-efficiency furnace or boiler (up to $600/year)

Utility Programs: DTE Energy and Consumers Energy

Michigan's two largest utilities both offer energy efficiency programs:

DTE Energy runs the Home Energy Consultation program, offering low-cost assessments that include direct-install measures (LED bulbs, smart power strips, low-flow showerheads). DTE also offers rebates including $300 for HVAC upgrades, $75 for smart thermostats, and $200 for insulation — with total available utility rebates reaching $725 depending on which upgrades qualify (DTE Energy, 2025).

Consumers Energy offers similar programs through their Home Energy Analysis and rebate portfolio. Consumers Energy customers can access rebates for insulation, HVAC, smart thermostats, and appliance upgrades. Their online energy assessment tool provides a starting point, though it doesn't replace the diagnostic testing of an in-person audit.

MI Energy Smart operates programs in territories served by smaller utilities, providing energy assessments and upgrade incentives for homeowners in rural areas not covered by DTE or Consumers.

Stacking Strategy

The smartest approach is to layer these incentives:

1. Get the audit ($300–$600)
2. Claim the $150 federal tax credit (cuts audit cost in half)
3. Use the audit report to qualify for MiHER rebates (up to $34,000)
4. Stack utility rebates from DTE or Consumers on top
5. Claim Section 25C tax credits for remaining upgrade costs

A household earning below 80% AMI could theoretically pay nothing out of pocket for both the audit and the recommended upgrades. Even moderate-income households can offset 50–70% of total improvement costs through this layered approach.

Who Are the Best Energy Auditors in Michigan?

Finding a qualified auditor in Michigan means looking for specific credentials and avoiding the common traps. Here's how to evaluate your options.

Certifications That Matter

BPI Building Analyst is the most common certification for residential energy auditors. BPI-certified auditors have passed written and field exams covering building science, diagnostic testing, and combustion safety. The Building Performance Institute maintains a contractor directory at bpi.org that you can search by ZIP code.

RESNET HERS Rater certification is more common in new construction but some existing-home auditors hold it as well. HERS Raters produce a Home Energy Rating System index score — a number between 0 and 150+ where lower is better. A standard new home scores around 100; a net-zero home hits 0.

BPI Envelope Professional and BPI Heating Professional are specialty certifications that indicate deeper expertise in specific areas. An auditor holding both the Building Analyst and one or more specialty certifications is a strong pick.

Michigan-Specific Auditor Networks

MiHER Qualified Contractors: To perform audits that qualify for MiHER rebates, contractors must be approved through the program. EGLE maintains a list of qualified energy assessors on the Michigan.gov home energy rebates page. Using an MiHER-qualified auditor ensures your audit meets program requirements and your upgrades qualify for the full rebate amounts.

Home Performance with ENERGY STAR: Michigan participates in this national program, which connects homeowners with certified contractors who follow a whole-house approach. Participating contractors must meet BPI or equivalent standards.

Michigan Energy Efficiency Contractors Association (MEECA): This trade group represents energy efficiency contractors across the state and can help connect homeowners with qualified professionals.

What to Look For

When evaluating auditors, ask these questions:

1. What certifications do you hold? BPI Building Analyst is the minimum. Ask for the certificate number and verify it on bpi.org.
2. What equipment do you bring? A legitimate audit requires a blower door, infrared camera, combustion analyzer, and duct blaster. If they show up with just a clipboard, leave.
3. Are you MiHER-qualified? If you plan to use MiHER rebates, this is non-negotiable.
4. Do you sell the work you recommend? Independent auditors who don't install what they recommend have no financial incentive to oversell. That said, some full-service contractors do quality work. The key is transparency about the conflict.
5. Can I see a sample report? A good report runs 15–30 pages and includes blower door results, thermal images, duct leakage numbers, combustion safety results, and a prioritized recommendation list with estimated costs and payback periods.

"The biggest red flag is an auditor who tells you what you need before they've done any testing," says Dr. Iain Walker, a senior scientist at Lawrence Berkeley National Laboratory who has studied residential energy diagnostics for over two decades. "A professional energy audit is a diagnostic process, not a sales pitch. The data should drive the recommendations, not the contractor's inventory."

Top Michigan Metros for Auditor Availability

Detroit Metro (Wayne, Oakland, Macomb counties): Highest concentration of certified auditors in the state. DTE Energy's territory, so most auditors are familiar with DTE rebate paperwork. Expect 15–25 BPI-certified firms to choose from.

Grand Rapids / West Michigan: Growing market with strong participation in Consumers Energy programs. The 2026 push for MiHER has expanded the auditor pool here significantly.

Lansing / Mid-Michigan: Moderate selection. The state capital's proximity to MSU's building science programs feeds local expertise.

Ann Arbor: Smaller market but high demand from environmentally conscious homeowners. Auditors here tend to be well-versed in deep retrofits and electrification pathways.

Traverse City / Northern Lower Peninsula: Fewer auditors, but the harsh climate (Climate Zone 6A) makes audits especially valuable. Book early — wait times of 3–6 weeks are common from October through March.

Upper Peninsula: Limited auditor availability. Some UP homeowners drive to Traverse City or Marquette for service. The extreme cold (8,000+ heating degree days) means audit findings are often dramatic — savings of $1,000+/year are not unusual.

How Do Michigan's Climate Zones Affect Audit Findings?

Michigan spans two major climate zones, and the difference matters for what an auditor finds and what they recommend.

Climate Zone 5A (Southern Lower Peninsula)

Most of Michigan's population lives in Zone 5A — Detroit, Grand Rapids, Lansing, Ann Arbor, Kalamazoo. This zone sees approximately 6,000–7,000 heating degree days annually (NOAA, 2025). The DOE-recommended attic insulation level is R-49 to R-60.

Common findings in Zone 5A homes:

• Under-insulated attics: Most pre-1980 homes have R-11 to R-19 in the attic — less than half the recommended level. Topping up blown cellulose or fiberglass to R-49 is often the single highest-ROI upgrade, with payback periods of 2–4 years.
• Uninsulated rim joists: The rim joist — where the floor framing sits on the foundation wall — is the most commonly missed air sealing opportunity in Michigan basements. Two inches of closed-cell spray foam here can reduce infiltration by 10–15%.
• Aging windows: Michigan homes from the 1960s–1980s often have single-pane or early double-pane windows with failed seals. But window replacement is expensive ($300–$800/window), and the energy payback is 15–25 years. Most auditors recommend sealing and weatherstripping before replacement — unless the frames are rotted.

For DIY sealing approaches you can tackle before the audit, check our caulking and weatherstripping guide.

Climate Zone 6A (Northern Lower Peninsula and Upper Peninsula)

North of a line roughly from Muskegon to Bay City, Michigan shifts to Zone 6A. Traverse City, Petoskey, Marquette, Sault Ste. Marie — these areas see 7,500–9,000+ heating degree days annually. The DOE-recommended attic insulation level jumps to R-49 to R-60, and walls should hit R-20 to R-25.

Common findings in Zone 6A homes:

• Ice dam damage: Heavy snow loads combined with attic air leakage and inadequate insulation create ice dams. Auditors in northern Michigan frequently find moisture damage behind exterior walls that homeowners never knew about. Thermal imaging during winter reveals the heat loss patterns driving ice formation.
• Extreme infiltration rates: Zone 6A homes routinely test above 15 ACH50, with some older Upper Peninsula homes hitting 25+. At that rate, the entire volume of heated air inside the house escapes in under three minutes during a blower door test. The heating cost impact is staggering.
• Undersized or oversized HVAC: Many UP homes have furnaces sized for a "typical" Michigan home, not for 8,000+ heating degree days. Others have been oversized by contractors using rule-of-thumb calculations instead of Manual J load calculations. Either way, the system runs inefficiently.

The energy savings potential in Zone 6A is enormous. A study by the Michigan Energy Office found that comprehensive weatherization of northern Michigan homes reduced annual energy consumption by an average of 29% (Michigan EGLE, 2024). At average natural gas prices of $1.30/therm, that's $600–$1,200/year in savings for a typical 1,800 sq ft home.

Should You Do a DIY Audit Before Hiring a Professional?

Short answer: yes, but with realistic expectations about what it will and won't tell you.

A DIY walkthrough can identify obvious problems — drafty windows, visible gaps around pipes and wires, missing attic insulation you can see from the hatch. We've written a full guide on DIY audits and when they're worth it that covers the basics.

But a DIY assessment has hard limits. You can't quantify air leakage without a blower door. You can't see inside walls without an infrared camera (consumer-grade thermal cameras help, but they lack the resolution and calibration of professional equipment). You can't test combustion safety without a combustion analyzer. And you can't build an energy model that predicts which improvements will save the most money without software and training.

What DIY Catches

• Visible attic insulation depth (easy to measure with a ruler)
• Obvious air leaks around windows, doors, and electrical outlets
• Duct connections that have separated or been knocked loose
• Missing weatherstripping on exterior doors
• Old, single-pane windows
• Thermostat setback habits and schedule issues
• Appliance age and efficiency ratings

What Only a Pro Finds

• Exact infiltration rate (ACH50) via blower door test
• Hidden insulation voids inside walls via thermal imaging
• Duct leakage percentage via Duct Blaster test
• Combustion safety hazards (CO spillage, backdrafting)
• Precise energy modeling with savings projections
• Manual J load calculations for right-sized HVAC replacement
• Moisture and mold issues hidden behind finishes

The gap between DIY and professional findings is substantial. A 2024 study by the Pacific Northwest National Laboratory found that homeowners who performed DIY assessments identified an average of 35% of the improvement opportunities that a professional auditor found (PNNL, 2024). The remaining 65% required diagnostic equipment or building science expertise to detect.

The best approach: do a DIY walkthrough first, fix the obvious stuff (weatherstripping, outlet gaskets, attic hatch seal), then hire a pro to find everything you missed. That way you're not paying a $400/hour professional to tell you your weatherstripping is shot — you already fixed that.

The Michigan Winter Advantage

Schedule your professional audit during cold weather — November through February is ideal. The larger the temperature difference between inside and outside, the more dramatic the thermal imaging results. An audit performed in July when it's 80°F outside and 72°F inside shows far less than one performed in January when it's 10°F outside and 68°F inside. Michigan winters are brutal, but they're also the best time to catch thermal defects.

How Do You Prepare for a Home Energy Audit in Michigan?

Maximizing the value of your audit starts before the auditor arrives. Here's a preparation checklist specific to Michigan homes.

Before the Appointment

Gather 12 months of utility bills. Both gas and electric. DTE Energy and Consumers Energy both offer online account access with 24-month billing history. The auditor will use this data to calibrate their energy model and verify that their findings align with your actual consumption.

Clear access points. The auditor needs to reach:

• Attic hatch or pull-down stairs (clear storage beneath)
• All exterior walls (move furniture 12 inches from walls where possible)
• Basement, including behind finished walls if there's access
• Furnace, water heater, and all mechanical equipment
• Electrical panel

Don't seal things up before the test. This sounds counterintuitive, but don't install new weatherstripping or seal gaps the week before a blower door test. You want the test to capture your home's actual condition. Fix things after you have baseline numbers.

Note your comfort complaints. Cold spots? Rooms that are always too hot or too cold? Drafty areas? Ice dams on certain roof sections? Write these down. This gives the auditor a diagnostic roadmap — they'll investigate those areas more carefully.

Check your furnace filter. A clogged filter affects airflow measurements. Replace it a week before the audit so the system runs normally during testing.

During the Audit

A comprehensive Level 2 audit takes 3–5 hours for an average Michigan home. Larger homes or those with complex basements can take 6+. Plan to be home the entire time — the auditor will have questions, and watching the process is educational.

Don't run bath fans, dryer, or kitchen exhaust during the blower door test. These create additional depressurization that skews results. The auditor will manage this, but it helps to know in advance.

Keep pets contained. Blower door testing involves an open-cell fan in your front door. Cats and small dogs have been known to make a break for it.

After the Audit

You should receive a written report within 1–2 weeks. A good report includes:

• Blower door results (ACH50 and CFM50)
• Thermal images with annotations
• Duct leakage results (CFM25 or percentage)
• Combustion safety test results
• Modeled energy consumption vs actual utility bills
• Prioritized list of improvements with estimated costs, annual savings, and payback periods
• Photos documenting specific findings

If your auditor hands you a one-page summary with no data, that's not a professional audit. Push back and request the full diagnostic results.

How We Ranked

Energy-auditor rankings draw on:

1. Verifiable credentials: BPI Building Analyst certification, HERS rater status, RESNET membership, state-utility-rebate eligibility, and IRS Inflation Reduction Act tax-credit verification capability.
2. Customer-reported outcomes: Google reviews from the past 24 months, BBB records, and any state attorney-general complaints. We flag patterns in upsell-pressure complaints and report-delivery timelines.
3. Direct phone verification asking about credential status, report format (digital + Manual J), turnaround time, and whether they file rebate paperwork on the homeowner's behalf.

What we never accept: paid placement or referral kickbacks from HVAC contractors / insulation installers. We use affiliate links to home-energy-monitoring tools (Emporia Vue, Sense) — these never affect auditor rankings.

Update cadence: quarterly auditor re-verification. Email research@energyauditfinder.com for corrections.

Frequently Asked Questions

How long does a home energy audit take in Michigan?

A comprehensive Level 2 audit typically takes 3–5 hours for a standard Michigan home (1,400–2,000 sq ft). Larger homes, homes with finished basements, or homes with complex HVAC systems can take 5–7 hours. The audit itself is one visit; the written report usually arrives within 1–2 weeks afterward. Utility-sponsored basic assessments (DTE Home Energy Consultation, Consumers Energy Home Energy Analysis) take 1–2 hours but include far less diagnostic testing.

Are there free energy audits available in Michigan?

Yes, through several channels. Michigan's Weatherization Assistance Program (WAP) provides free comprehensive audits and upgrades for income-eligible households — generally those at or below 200% of the federal poverty level. DTE Energy and Consumers Energy both offer low-cost or no-cost basic assessments through their efficiency programs. The MiHER program may subsidize audit costs for qualifying households, particularly those below 80% AMI who qualify for enhanced rebates. However, free utility assessments are typically basic walk-throughs, not comprehensive diagnostic audits.

What is the average energy audit payback period for Michigan homeowners?

Based on Michigan-specific data, a $300–$500 comprehensive audit typically identifies $500–$1,400 in annual savings opportunities. That puts the audit payback at 3–12 months, depending on home age and condition. The recommended upgrades have longer payback periods: air sealing (1–3 years), attic insulation (2–5 years), duct sealing (2–4 years), and heat pump installation (5–10 years). With MiHER rebates covering 50–100% of upgrade costs, effective payback periods drop dramatically — sometimes to under one year for income-qualifying households.

Do I need a separate audit for MiHER rebates?

The MiHER Home Efficiency Rebates (HOMES) program requires an official home energy assessment performed by a MiHER-qualified energy assessor. This assessment establishes baseline energy performance and verifies post-improvement savings. The HEAR program (electrification rebates) does not always require a separate audit for individual appliance rebates, but a professional assessment helps ensure you're targeting the right upgrades and maximizing your rebate amount. Check the MiHER qualified contractor list at michigan.gov/egle to find assessors whose audits meet program requirements.

Is winter or summer better for a Michigan energy audit?

Winter is significantly better for thermal imaging quality. The greater the temperature difference between indoors and outdoors, the more clearly an infrared camera reveals insulation gaps, thermal bridges, and air leakage paths. A Michigan January (10–25°F outside, 68°F inside) provides a 40–58°F differential — far superior to July's 5–15°F differential. Blower door and duct leakage tests work equally well in any season, but the thermal imaging component alone justifies scheduling during cold months. The trade-off: winter is peak season for Michigan auditors, so book 3–6 weeks in advance, especially in northern Michigan.

Related Reading

• DIY Duct Mastic Sealing Guide — Step-by-step instructions for sealing leaky ductwork yourself
• What DIY Energy Audits Miss — The diagnostic gaps between a homeowner walkthrough and professional testing
• DIY Caulking and Weatherstripping Guide — Low-cost air sealing you can do before hiring a pro

Sources

• Michigan Home Energy Rebates (MiHER) — Michigan.gov
• MiHER FAQ — Michigan EGLE
• MI Energy Rebates Portal
• Michigan Energy Smart Programs
• U.S. Department of Energy — Home Energy Audits
• Building Performance Institute — Contractor Locator
• ENERGY STAR — Home Energy Yardstick
• U.S. Census American Community Survey — Housing Characteristics

-- The Efficiency Team