Best Home Energy Audits in Illinois: 2026 Guide

Last updated: April 2026

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Illinois has a climate that punishes inefficient homes from both directions. Bitter winters where wind chill drops below -20°F. Humid summers that push air conditioning hard through July and August. The Department of Energy estimates that the average Illinois household uses 34% more energy for heating than the national median (DOE, 2024). That's not a number you can ignore — and it's exactly why a professional energy audit here delivers outsized returns.

But here's the thing. Most homeowners in Illinois have never had one. A 2025 survey by the Midwest Energy Efficiency Alliance found that only 12% of Illinois homeowners had completed a professional energy audit in the previous five years, despite 68% saying they were "concerned" about energy costs (MEEA, 2025). There's a massive gap between awareness and action. This guide is designed to close it.

We'll cover exactly what an Illinois energy audit includes, what it costs in different parts of the state, who the best auditors are, and how to stack every available rebate and tax credit so the audit pays for itself — often within months.

What Does a Home Energy Audit Include in Illinois?

A legitimate energy audit in Illinois isn't someone walking through your house with a clipboard and handing you a pamphlet about LED bulbs. That's a utility walkthrough — useful, but barely scratching the surface. A real audit follows BPI (Building Performance Institute) or RESNET (Residential Energy Services Network) protocols and involves diagnostic equipment that costs more than most used cars.

Here's what a comprehensive Level 2 audit covers in Illinois:

Blower Door Testing

A calibrated fan mounts in your front door frame, depressurizes the house to 50 Pascals, and measures exactly how much air leaks through your building envelope. The result — expressed as air changes per hour at 50 Pascals (ACH50) — tells you how leaky your home is. The 2024 IECC target for new construction in Climate Zone 5 (most of Illinois) is 3.0 ACH50. Most Illinois homes built before 1980 test between 10 and 20 ACH50.

That matters because air leakage accounts for 25–30% of residential heating and cooling energy use (DOE, 2024). In a state where January temperatures regularly stay below 20°F for weeks, conditioned air escaping through gaps in your envelope is money vanishing into the wind — literally.

Infrared Thermography

Thermal imaging cameras detect temperature differentials in walls, ceilings, and floors. Missing insulation, moisture intrusion, thermal bridging at framing members — it all shows up as color variations on the scan. Illinois homes built between 1940 and 1975 are particularly prone to insulation voids. Many were built with zero wall cavity insulation, relying entirely on the mass of brick or wood siding.

A skilled auditor will scan every exterior wall, the attic hatch, rim joists (the perimeter of each floor where the floor system meets the exterior wall), and around all windows and doors. This is where a DIY assessment falls short — consumer-grade thermal cameras lack the resolution and calibration to catch subtle deficiencies.

Duct Leakage Testing

Using a Duct Blaster device, the auditor pressurizes your HVAC ductwork and measures how much conditioned air escapes before reaching your living spaces. The average American home loses 20–30% of its HVAC airflow through duct leaks (ENERGY STAR, 2024). In Illinois, where ductwork often runs through unconditioned attics, crawl spaces, or unfinished basements, those losses translate directly to higher gas and electric bills.

If your ducts are accessible after the audit, mastic sealing is one of the highest-ROI fixes you can tackle yourself.

Combustion Safety Testing

Illinois still runs predominantly on natural gas for heating — roughly 77% of households use gas as their primary heating fuel (EIA, 2024). BPI-certified auditors are required to test combustion appliances for carbon monoxide spillage, draft pressure, and gas leak detection. This isn't just an efficiency concern. Backdrafting furnaces and water heaters can push combustion gases — including carbon monoxide — into your living space. Every comprehensive audit should include this.

Energy Modeling and Report

After gathering field data, the auditor builds an energy model of your home. This predicts annual energy use, identifies the biggest loss pathways, and ranks improvement recommendations by cost-effectiveness. Some auditors produce a HERS (Home Energy Rating System) score; others provide a simpler payback analysis showing projected savings for each recommended upgrade.

The average existing Illinois home scores between 110 and 150 on the HERS Index (RESNET, 2025), where 100 represents the 2006 IECC reference home and 0 is net-zero. That gap between where most homes sit and where they could be represents thousands of dollars in annual savings potential. When your auditor's report shows up, our How to Read a Home Energy Audit Report [2026 Decoder Guide] explains which sections to act on first.

"Most Illinois homeowners are surprised by what the blower door reveals," says Larry Zarker, former CEO of BPI and a longtime advocate for building performance standards. "The envelope problems are almost always worse than people expect, especially in pre-1970s housing stock — and that's most of the housing in this state."

How Much Does a Home Energy Audit Cost in Illinois?

Illinois audit pricing varies by region, home size, and audit depth. Here's what you'll actually pay in 2026:

Several factors affect pricing across the state:

Chicago metro premium. Auditors in the city and inner suburbs (Cook County, DuPage, Lake) tend to charge 15–25% more than downstate competitors. The cost of living difference is real — and so is demand. BPI's directory shows more certified auditors per capita in the Chicago metro area than anywhere else in the Midwest (BPI, 2025).

Home size and age. The median Illinois home is approximately 1,700 sq ft (Census, 2024), but older Victorian-era homes in neighborhoods like Oak Park, Evanston, or the historic districts of Springfield can run 2,500–4,000 sq ft with complex envelope geometries. Expect to pay more for larger, older homes.

Audit depth. A Level 1 visual walkthrough is cheap but limited. A Level 2 audit with full diagnostic testing is where the real value lies — the blower door and thermal imaging catch problems that visual inspections miss entirely.

"For a typical Illinois single-family home, you're looking at $300 to $450 for a quality comprehensive audit," says Nick Noel, a BPI-certified auditor and home performance contractor working across the Chicago suburbs. "When you factor in the $150 federal tax credit and potential utility incentives, the out-of-pocket cost drops to almost nothing — and the audit findings typically save homeowners $800 to $1,500 per year."

How to Reduce Your Audit Cost

The single best way to lower your cost is stacking incentives:

1. Federal tax credit: The IRS Section 25C Energy Efficient Home Improvement Credit provides a $150 credit specifically for home energy audits conducted by a qualified auditor (IRS, 2026). This is an annual credit — not a one-time deal.

2. Utility programs: Both ComEd and Ameren Illinois offer free or subsidized energy assessments for qualifying customers (see the rebates section below for details).

3. Income-qualified programs: Illinois's Weatherization Assistance Program provides free comprehensive audits and upgrades for households at or below 200% of the federal poverty level. Contact your local Community Action Agency to apply.

4. IRA HOMES rebates: While the audit itself isn't directly rebated under HOMES, completing a professional audit is often required to qualify for the whole-home retrofit rebates of up to $4,000 — making the audit a gateway to far larger savings.

What Are the Best Utility Energy Audit Programs in Illinois?

Illinois has two major investor-owned utilities serving residential customers, and both run energy efficiency programs funded by ratepayer surcharges. These programs are a genuine value — and most Illinois residents are already paying for them through their bills whether they use them or not.

ComEd (Northern Illinois)

ComEd serves approximately 4 million customers across northern Illinois, including the entire Chicago metropolitan area. Their energy efficiency programs include:

Free Home Energy Assessment: ComEd offers online home energy assessments that analyze your usage patterns and provide personalized recommendations. While not a substitute for a professional audit with diagnostic testing, it's a useful starting point.

Rebates on upgrades: ComEd provides substantial rebates for HVAC upgrades, insulation, and air sealing performed after a qualifying audit. In 2026, heat pump installation rebates through ComEd range from $1,000 to $3,500 depending on system type and efficiency rating. Ductless mini-split rebates start at $500 per head.

Income-eligible programs: ComEd's partnership with the Illinois Home Weatherization Assistance Program offers free comprehensive audits AND free upgrades (insulation, air sealing, appliance replacement) for income-qualifying households. The income threshold is generally 200% of the federal poverty level — roughly $62,400 for a family of four in 2026.

Ameren Illinois (Central and Southern Illinois)

Ameren Illinois serves approximately 1.2 million electric and 816,000 natural gas customers across central and southern Illinois. Their energy efficiency offerings are among the most generous in the Midwest.

Home Energy Assessment: Ameren offers in-home energy assessments that include basic diagnostics and direct-install measures (LED bulbs, water heater pipe insulation, smart power strips). For income-qualifying customers, Ameren provides FREE comprehensive assessments AND home efficiency upgrades at little to no cost.

ActOnEnergy rebates: Ameren's ActOnEnergy program offers rebates for insulation upgrades ($200–$1,000), air sealing ($200–$500), HVAC equipment ($500–$3,500 for qualifying heat pumps), and smart thermostats ($75–$100). These can be stacked with federal tax credits.

Marketplace discounts: The Ameren Illinois Savings marketplace offers instant discounts on energy-efficient products — smart thermostats, LED lighting, advanced power strips — shipped directly to your door.

Nicor Gas and Peoples Gas

If you heat with natural gas in the Chicago area, Peoples Gas and North Shore Gas offer their own rebate programs that complement ComEd's electric-side incentives. Nicor Gas, serving suburban Chicago and parts of downstate, offers rebates for high-efficiency furnaces, boilers, and insulation upgrades. Check each utility's current program page — rebate amounts and qualifying equipment change annually.

The smartest approach is to audit first, then stack utility rebates on top of federal tax credits and IRA rebates for maximum savings on the recommended upgrades.

How Do Illinois IRA Rebates Work for Energy Audits and Upgrades?

The Inflation Reduction Act of 2022 allocated $263 million specifically to Illinois through two major rebate programs administered by the Illinois EPA Office of Energy. As of early 2026, these programs are rolling out — and they represent the largest home energy incentive in the state's history.

HOMES Rebates (Section 50121)

The Home Efficiency Rebates program — branded nationally as "HOMES" — rewards whole-home energy improvements based on measured or modeled energy savings. Illinois's HOMES program statewide launch targeted late 2025 to early 2026.

Here's how the rebate tiers work:

The key detail: you need a professional energy audit to qualify. An auditor models your current home performance, then models the projected savings from recommended improvements. If the upgrades hit the 20% or 35% savings thresholds, you qualify for the corresponding rebate tier. This is where a quality audit becomes not just informative but financially essential.

HEAR Rebates (Section 50122)

The Home Electrification and Appliance Rebates program provides point-of-sale rebates on specific electrification upgrades. Illinois submitted its HEAR application in 2024 and is awaiting final DOE approval as of spring 2026. When launched, HEAR will offer:

• Heat pump HVAC: Up to $8,000
• Heat pump water heater: Up to $1,750
• Electric stove/cooktop: Up to $840
• Heat pump dryer: Up to $840
• Electric panel upgrade: Up to $4,000
• Insulation and air sealing: Up to $1,600
• Electric wiring: Up to $2,500

Illinois has proposed limiting HEAR eligibility to households at or below 80% of area median income (AMI). For a family of four in the Chicago metro, 80% AMI is approximately $75,500 in 2026. This income restriction is more limiting than the HOMES program, but the rebate amounts are substantial — up to $14,000 per household.

Section 25C Tax Credits (Available Now)

While the HOMES and HEAR rebate programs are still rolling out, the federal tax credits under IRS Section 25C are available right now — you can claim them on your 2026 tax return. Key credits for Illinois homeowners:

• Home energy audit: $150 credit (audit must be conducted by a certified professional)
• Insulation and air sealing: 30% of costs, up to $1,200/year
• Heat pumps: 30% of costs, up to $2,000/year
• Windows and doors: 30% of costs, up to $600 for windows, $500 for doors
• Electrical panel upgrade: 30% of costs, up to $600

These credits reset annually, meaning you can spread improvements across multiple tax years to maximize the total benefit. A common strategy: audit in year one (claim the $150 credit), air sealing and insulation in year one (claim up to $1,200), heat pump in year two (claim up to $2,000).

Who Are the Best Energy Auditors in Illinois?

Finding a qualified auditor in Illinois means looking for specific certifications, checking references, and understanding the difference between independent auditors and contractor-affiliated ones.

What Certifications to Look For

BPI Building Analyst (BA): The most widely recognized certification for residential energy auditors. BPI Building Analysts have demonstrated competency in whole-house diagnostics, including blower door testing, combustion safety, and insulation analysis. BPI maintains a searchable directory at bpi.org — as of 2025, Illinois has approximately 340 active BPI-certified professionals.

RESNET HERS Rater: If you need a HERS Index score — common for new construction verification, real estate transactions, or HOMES rebate qualification — look for a RESNET-certified HERS Rater. RESNET's directory lists roughly 180 active raters in Illinois (RESNET, 2025).

BPI Envelope Professional: A step above the general Building Analyst certification, focused specifically on building envelope analysis. Useful if your primary concerns are insulation, air sealing, and moisture management.

For a deeper dive on the certification differences and what each means for your audit quality, check our BPI vs RESNET comparison.

Independent Auditors vs. Contractor-Affiliated

This distinction matters more than most homeowners realize. An independent energy auditor has no financial incentive to recommend specific products or contractors. They get paid for the audit itself. A contractor-affiliated auditor — someone working for an HVAC company, insulation installer, or general contractor — may offer "free" or discounted audits, but their recommendations naturally skew toward the services their company sells.

Neither approach is inherently bad. But you should know the business model behind your audit. If an HVAC company offers a "free energy assessment," understand that they're investing in the assessment to sell you equipment. The recommendations may be legitimate, but they won't be comprehensive — they'll focus on what that contractor installs.

For the most unbiased assessment, hire an independent BPI-certified auditor who does not install equipment or materials. They charge $300–$500 for the audit, and their report is your roadmap — you can get multiple bids on the recommended work from whatever contractors you choose.

How to Find Auditors in Your Area

1. BPI Contractor Directory: Search by zip code at bpi.org/find-a-contractor
2. RESNET HERS Rater Directory: Search at resnet.us/find-a-rater
3. Utility program referrals: Both ComEd and Ameren Illinois maintain lists of approved contractors for their rebate programs
4. Illinois Home Performance: The Illinois Home Performance with ENERGY STAR program connects homeowners with vetted auditors statewide
5. Weatherization agencies: Local Community Action Agencies coordinate free audits for income-qualifying households through the DOE Weatherization Assistance Program

What Are the Most Common Audit Findings in Illinois Homes?

Illinois has a unique housing stock. Nearly 40% of the state's homes were built before 1960 (Census, 2024). Chicago alone has hundreds of thousands of brick bungalows, two-flats, and greystones — building types with specific, predictable energy problems. Downstate, you'll find more ranch homes and farmhouses with their own set of issues.

Here are the most common findings from Illinois energy audits, ranked by frequency and impact:

1. Inadequate Attic Insulation

This is the number-one finding in Illinois audits — and it's usually the highest-ROI fix. The 2024 IECC recommends R-49 to R-60 in attics for Climate Zone 5 (most of Illinois). Many older homes have R-11 to R-19 — or less. Some vintage Chicago bungalows have nothing but plaster and lath between the living space and the attic.

Adding blown-in cellulose or fiberglass to bring attic insulation to R-49 typically costs $1,500–$3,000 for a standard Illinois home and saves $300–$600 per year on heating costs. That's a 2-5 year payback even before rebates.

2. Excessive Air Leakage

Illinois homes are leaky. Period. The average pre-1970 Illinois home tests at 12–18 ACH50 on a blower door test — meaning the entire volume of conditioned air in the house is replaced by outside air 12 to 18 times per hour at test pressure. By comparison, new construction targets 3.0 ACH50 or lower.

The biggest culprits: unsealed attic penetrations (plumbing stacks, electrical chases, recessed lights), leaky rim joists, uninsulated basement sill plates, and poorly sealed windows and doors. Professional air sealing of the top air leakage sites costs $500–$2,000 and can reduce ACH50 by 30–50%.

For accessible areas, caulking and weatherstripping can address some leaks — but the biggest sources (attic bypasses, rim joists) usually require professional spray foam or rigid board application.

3. Duct Leakage in Unconditioned Spaces

If your ductwork runs through an unconditioned attic, crawl space, or unfinished basement — common in Illinois ranch homes and split-levels — you're likely losing 20–30% of your HVAC output to leaks and poor insulation on the ducts themselves. Duct sealing and insulation costs $500–$1,500 and typically pays back in 1-3 years.

4. Old, Inefficient HVAC Equipment

The average furnace lifespan is 15–20 years, and many Illinois homes are running 80% AFUE furnaces that were installed in the 2000s or earlier. Modern high-efficiency furnaces hit 96–98% AFUE. For homes considering full electrification, cold-climate heat pumps now operate effectively down to -13°F — relevant for Illinois winters — with COPs of 2.0 or higher even at low temperatures (NEEP, 2025).

5. Basement and Crawl Space Moisture Issues

Illinois's water table and clay soils create persistent moisture problems in basements and crawl spaces. Auditors frequently find uninsulated basement walls, moisture on concrete surfaces, and crawl spaces with bare earth floors and no vapor barriers. These conditions waste energy and create indoor air quality concerns.

6. Single-Pane and Poorly Sealed Windows

Older homes throughout Illinois — especially pre-1970 construction — often still have single-pane windows or original double-pane units that have lost their seal. While window replacement is rarely the highest-ROI upgrade (it's expensive relative to the energy savings), auditors frequently identify window issues that can be partially addressed with weatherstripping, storm windows, or window seal kits at much lower cost.

Should You Get a DIY Energy Audit or Hire a Professional in Illinois?

This is a fair question. DIY energy assessment tools have gotten better — consumer thermal cameras, smart home energy monitors, and free online calculators can all provide some insight into your home's performance. But in Illinois specifically, there are strong reasons to invest in a professional audit.

When DIY Makes Sense

A DIY approach works well as a first step. Walking through your home with a checklist — checking for visible air leaks around windows, inspecting attic insulation levels, looking at your HVAC filter and ductwork — costs nothing and can identify obvious problems. If you find R-8 of cellulose in your attic when you should have R-49, you don't need a professional to tell you to add more.

Consumer-grade thermal cameras (the FLIR ONE or Seek Thermal attachments for smartphones) cost $200–$400 and can reveal major insulation voids and air leaks. They're not calibrated like professional equipment, but they'll show you the big problems.

When Professional Is Worth Every Dollar

A professional audit is essential when:

You want to qualify for rebates. The IRA HOMES rebate requires a professional energy model showing projected savings. The $150 Section 25C tax credit requires a certified auditor. Utility rebate programs typically require a qualifying audit as a prerequisite for upgrade incentives. DIY assessments don't count for any of these.

You have combustion appliances. If your home has a gas furnace, gas water heater, or gas dryer, combustion safety testing is critical — and it requires professional equipment and training. Carbon monoxide backdrafting is a safety issue, not just an efficiency one.

You want a prioritized improvement plan. A professional doesn't just find problems — they rank solutions by ROI. Knowing that air sealing your attic bypasses will save more than replacing your windows helps you spend your improvement budget where it matters most.

Your home is older than 1970. Pre-1970 Illinois homes almost always have multiple, overlapping efficiency problems that interact with each other. A professional understands these interactions — for example, that aggressive air sealing without addressing ventilation can create moisture and indoor air quality problems.

"The $300–$500 you spend on a professional audit typically returns $5,000 to $15,000 in targeted improvements over the following 3-5 years," says Dr. Stacy Gloss, a researcher at the University of Illinois's Smart Energy Design Assistance Center. "Without the audit, homeowners tend to spend on upgrades that feel important but aren't — like replacing windows when the real problem is air leakage in the attic."

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

Getting the most value from your audit requires some preparation. Here's what to do before the auditor arrives:

Gather Your Utility Bills

Pull 12 months of gas and electric bills. Most Illinois utilities (ComEd, Ameren, Nicor Gas, Peoples Gas) provide 13-month billing history online. Your auditor will use this data to calibrate their energy model and identify seasonal patterns.

If your winter gas bills are dramatically higher than summer bills, that points to heating-related losses. If summer electric bills spike, cooling and duct leakage are likely culprits.

Make Spaces Accessible

The auditor needs access to your attic, basement, crawl space, mechanical room, and all exterior walls. Move stored items away from:

• The attic hatch or pull-down stairs
• The furnace and water heater
• Rim joists and sill plates in the basement
• Any crawl space access points
• Electrical panel

Note Your Comfort Concerns

Write down the specific problems you want solved. Cold rooms in winter? Hot spots in summer? Drafty windows? High bills despite moderate thermostat settings? Musty basement smell? These observations give the auditor direction and help them prioritize their diagnostic work.

Ensure Combustion Appliances Are Running

If it's summer and your furnace has been off, let the auditor know. Combustion safety testing requires the appliance to be operating. Some auditors will ask you to turn the furnace on briefly even in warm weather.

Check Your HVAC Filter

A clogged filter restricts airflow and skews duct leakage test results. Replace it before the audit so the auditor gets clean baseline measurements.

Plan for the Time

A comprehensive Level 2 audit takes 2–4 hours for a typical Illinois home. Larger or more complex homes (multi-story, additions, finished basements with concealed systems) can take longer. Be home for the entire appointment — the auditor will have questions about your home's history, renovation work, and comfort priorities.

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 Illinois?

A comprehensive Level 2 audit typically takes 2–4 hours for a standard single-family home (1,500–2,500 sq ft). This includes setup time for the blower door, the diagnostic testing sequence, infrared scanning, combustion safety testing, and a walkthrough discussion of preliminary findings. You'll receive the full written report with prioritized recommendations within 1–2 weeks. Utility-sponsored basic assessments are shorter — usually 45–90 minutes — but cover far less ground.

Are home energy audits tax deductible in Illinois?

Energy audits qualify for a $150 federal tax credit under IRS Section 25C (not a deduction — a direct credit against your tax liability). The audit must be conducted by a qualified home energy auditor who is certified by a DOE-recognized program such as BPI or RESNET. There is no separate Illinois state tax credit for energy audits as of 2026, but the federal credit resets annually, so you can claim it again in future years if you get follow-up audits.

What is the average energy savings after an Illinois home energy audit?

Studies show that homeowners who follow through on audit recommendations save 20–30% on annual energy costs (DOE, 2024). For the average Illinois household spending $2,040/year on energy, that translates to $400–$600 in annual savings from basic improvements (air sealing, insulation, duct sealing) and up to $1,500/year for comprehensive upgrades including HVAC replacement. The Midwest Energy Efficiency Alliance reports that Illinois weatherization program participants save an average of $437 per year on heating costs alone (MEEA, 2025).

Do I need an energy audit to get IRA rebates in Illinois?

For the HOMES whole-home rebate program — yes. The modeled pathway requires a professional energy audit that demonstrates projected savings of at least 20% to qualify for rebates of $2,000–$8,000. For HEAR (electrification and appliance rebates), an audit is not strictly required, but having one helps you identify which upgrades will deliver the most savings. For Section 25C tax credits on specific equipment (heat pumps, insulation, windows), you don't need an audit — but the audit itself qualifies for its own $150 credit, and it ensures you're spending your upgrade budget on the right improvements.

Can I get a free energy audit in Illinois?

Yes — through several pathways. The Illinois Weatherization Assistance Program provides free comprehensive audits and free upgrades for households at or below 200% of the federal poverty level (approximately $62,400 for a family of four in 2026). Ameren Illinois offers free home energy assessments for income-qualifying customers, and ComEd runs similar programs. Some municipal utilities and co-ops also offer free assessments. Even if you don't qualify for free programs, stacking the $150 federal tax credit with utility incentives can reduce out-of-pocket costs to under $100 for a comprehensive audit.

Related Reading

• What DIY Energy Audits Miss — The critical findings that only professional diagnostic equipment can catch
• DIY Duct Mastic Sealing Guide — How to seal accessible ductwork yourself after your audit identifies leaks
• DIY Caulking and Weatherstripping Guide — Tackle the easier air sealing tasks on your own
• DIY Home Energy Audits: When They're Worth It — When a DIY approach makes sense and when to call a pro

Sources

• U.S. Department of Energy — Home Energy Audits
• IRS — Energy Efficient Home Improvement Credit (Section 25C)
• Illinois EPA — Energy Rebates and IRA Programs
• ENERGY STAR — Duct Sealing
• Building Performance Institute — Find a BPI Contractor
• RESNET — HERS Index
• Citizens Utility Board — IRA Benefits for Illinois Consumers
• Ameren Illinois — Energy Efficiency Programs

-- The Efficiency Team