Best Home Energy Auditors in Phoenix, Denver, and Seattle: 2026 Guide

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Your energy bills are climbing. Your house feels drafty in winter, stuffy in summer, and you're pretty sure the HVAC system is working twice as hard as it should. You're not imagining it. The average American household wastes 25-30% of the energy it consumes, according to the Department of Energy. That's hundreds — sometimes thousands — of dollars leaking through your walls, windows, and ductwork every single year.

A professional home energy audit is the single best investment you can make before touching your insulation, upgrading your HVAC, or installing solar panels. It tells you exactly where the problems are, ranked by impact and cost to fix. No guessing. No wasting money on upgrades that don't move the needle.

But finding the right auditor? That's where most homeowners get stuck. Phoenix, Denver, and Seattle each have wildly different climates, building codes, utility incentive programs, and contractor ecosystems. What works in the dry desert heat of the Valley doesn't apply to Denver's altitude-driven temperature swings or Seattle's damp, marine climate.

This guide breaks it all down. City by city. Company by company. With real costs, real rebate programs, and the criteria that actually matter when you're hiring someone to diagnose your home's energy performance.

Quick Answer: Best Home Energy Auditors by City (2026)

Why a Home Energy Audit Matters More in 2026

Energy costs have increased 22% nationally since 2020. In the three metro areas covered here, the picture is even more dramatic. Phoenix residents saw APS and SRP rate hikes totaling 14% over the past two years. Denver's Xcel Energy raised rates 8.5% in 2025 alone. And Seattle City Light, while still among the cheapest utilities in the country, approved a 7% increase effective January 2026.

Those rate hikes aren't going away. The grid is under stress from electrification, data center demand, and extreme weather events. The homeowners who'll pay the least going forward are the ones who make their homes tight, efficient, and smart about when and how they use energy.

A professional energy audit typically identifies $200-$800 in annual savings opportunities. For a $300 audit, that's a payback period measured in months, not years. And that's before you factor in the comfort improvements — fewer drafts, more consistent temperatures, better indoor air quality.

The federal Inflation Reduction Act (IRA) continues to fund up to $150 in direct rebates for home energy audits through 2032. Several state and local programs stack on top of that. In Denver, for example, Xcel Energy subsidizes 60% of the audit cost, bringing your out-of-pocket to just $135. In Arizona, SRP offers free home energy checkups for qualifying customers.

If you haven't had an audit done, 2026 is the year. The incentives are at their peak, qualified auditors are available (the post-IRA rush has normalized), and energy costs will only keep climbing.

For a detailed breakdown of what you'll pay, check out our Energy Audit Cost guide.

What Happens During a Professional Home Energy Audit

Before we get into specific companies and cities, let's level-set on what you're actually paying for. A real energy audit — not a quick walkthrough from your utility company — involves several diagnostic steps that reveal problems invisible to the naked eye.

Blower Door Test

This is the backbone of any legitimate audit. A calibrated fan mounts into an exterior door frame and depressurizes your home. The auditor then measures how much air leaks in through cracks, gaps, and penetrations. Results are reported in CFM50 (cubic feet per minute at 50 pascals of pressure) and ACH50 (air changes per hour at 50 pascals).

A tight modern home hits 3-5 ACH50. Older homes in Denver and Seattle routinely test at 10-15 ACH50 — meaning the entire volume of air in your house is replaced by outside air 10-15 times per hour when the fan runs. That's a massive energy penalty.

Thermal Imaging

Infrared cameras reveal temperature differences across your walls, ceilings, and floors. Missing insulation shows up as cold spots in winter or hot spots in summer. Air leaks appear as streaks of different-colored thermal signatures. In Phoenix, this is especially valuable for detecting radiant heat gain through attic spaces and west-facing walls where temperatures can exceed 150°F in summer.

Duct Leakage Testing

A separate test pressurizes your ductwork to measure how much conditioned air escapes before reaching your rooms. The average home loses 20-30% of conditioned air through duct leaks. In Phoenix, where your AC runs 6+ months a year, that translates to $300-$600 wasted annually on air that never reaches your living spaces.

Combustion Safety Testing

For homes with gas appliances — furnaces, water heaters, fireplaces — the auditor checks for proper venting, carbon monoxide levels, and draft. This is a safety issue, not just an efficiency one. Denver's altitude (5,280 feet) affects combustion dynamics, making this test particularly important for Front Range homes.

Visual Inspection and Report

The auditor examines insulation levels, window conditions, appliance ages and efficiency ratings, lighting, and water heating. Everything rolls into a prioritized report showing what to fix first, estimated costs, available rebates, and projected savings.

A thorough audit takes 2-4 hours for a typical single-family home. Anyone who promises comprehensive results in 45 minutes is cutting corners.

Wondering whether you can do this yourself? Our Audit vs DIY comparison walks through exactly what you can and can't replicate without professional equipment.

Best Home Energy Auditors in Phoenix

Phoenix presents a unique energy challenge. Cooling dominates — it accounts for 50-70% of residential energy bills between May and October. The desert climate means extreme daily temperature swings (sometimes 30-40°F between day and night), intense solar radiation, and virtually zero humidity. Homes built before Arizona's 2010 energy code updates often have grossly insufficient attic insulation, single-pane windows, and ductwork running through unconditioned attic spaces where ambient temperatures reach 150°F+.

Here's who does the best work in the Valley.

Home Energy Auditing & Thermography

Best for: Comprehensive diagnostic audits with advanced thermal imaging

Led by Jason Owsley, this BPI-certified firm has been conducting energy audits across the Greater Phoenix Valley for over a decade. They specialize in infrared thermography — critical in a market where radiant heat gain is the dominant energy penalty.

What sets them apart is the depth of their thermal analysis. While most auditors take a few infrared images and call it done, this team performs systematic scans of every exterior wall, ceiling cavity, and duct run. They've documented thousands of Phoenix-area homes and understand the specific failure patterns of desert construction: poorly sealed can lights, inadequate radial barrier in attics, duct connections that separate in extreme heat cycles.

• Cost: $200-$450 depending on home size
• Service area: Greater Phoenix Valley
• Certifications: BPI Building Analyst, Infrared Thermographer
• Turnaround: Report delivered within 3-5 business days
• Best for homes: Built before 2010, suspected insulation issues, high summer bills

FOR Energy

Best for: Budget-conscious homeowners in Maricopa County

FOR Energy offers home energy audits across Phoenix, Glendale, Peoria, and Sun City with free initial estimates. They've built their reputation on accessibility — making professional energy assessment available to homeowners who might otherwise skip it due to cost concerns.

Their audits include blower door testing, thermal imaging, and duct leakage assessment. They also handle the remediation work (insulation, air sealing, duct repair), which can be a pro or con depending on your perspective. The convenience of one-stop service is real, but always get a second quote on any recommended work over $2,000.

• Cost: Free estimates; full audits $0-$300 depending on utility program eligibility
• Service area: Phoenix, Glendale, Peoria, Sun City, Maricopa County
• Certifications: BPI-certified
• Turnaround: Same-week scheduling in most cases
• Best for homes: First-time audits, SRP/APS customers seeking utility-subsidized assessments

Ideal Air Conditioning and Insulation

Best for: Combined HVAC and energy audit services

This family-owned team brings HVAC expertise to the energy auditing process. If you suspect your air conditioning system is part of the problem (and in Phoenix, it often is), their dual focus on mechanical systems and building envelope performance delivers a more complete picture.

They're particularly strong on duct diagnostics. Phoenix homes with ductwork in the attic — which is most of them — lose enormous amounts of energy. Ideal Air can audit, diagnose, and fix duct problems in a single engagement, saving you the hassle of coordinating between an auditor and a separate HVAC contractor.

• Cost: $250-$400
• Service area: Phoenix metro
• Certifications: HVAC licensed, energy auditing certified
• Turnaround: Reports within one week
• Best for homes: HVAC systems over 10 years old, suspected duct problems

Phoenix-Specific Tips

Utility programs to know about: SRP offers free Home Energy Savings Reviews for residential customers. APS provides rebates up to $300 for qualifying efficiency upgrades identified during audits. Both programs change annually — call before scheduling your audit to confirm current offerings.

Timing matters: Schedule your audit for early morning (before 9 AM) during summer months. Thermal imaging produces the most useful results when there's a significant temperature differential between inside and outside. By 7 AM on a July day, exterior surfaces are already heating up while your interior is cool — perfect conditions for revealing insulation failures.

Watch for: Radiant barrier condition in attics, duct connection integrity (heat cycling causes separations), single-pane window performance on west-facing walls, and pool pump energy consumption (often overlooked but can account for 15-20% of annual energy use).

Best Home Energy Auditors in Denver

Denver's energy profile is the opposite of Phoenix. Heating dominates, accounting for 40-60% of residential energy costs. The altitude introduces unique challenges: lower air density affects combustion efficiency, intense UV radiation degrades roofing and sealants faster than at sea level, and the 300+ days of sunshine create significant solar heat gain even in winter.

The Front Range also has the most aggressive utility rebate program of our three cities, making audits exceptionally affordable.

REenergizeCO

Best for: Maximizing Xcel Energy rebates

REenergizeCO has been Xcel Energy's top-producing Home Energy Audit contractor every year from 2013 through 2025. That's not a marketing claim — it's verified by Xcel's own program data. They've helped more Colorado homeowners claim energy rebates than any other contractor in the Denver metro area.

The economics here are hard to beat. Xcel Energy underwrites 60% of the audit cost, bringing your out-of-pocket expense to just $135. That buys you a comprehensive assessment including blower door testing, thermal imaging, combustion safety analysis, and a prioritized improvement plan with specific rebate amounts for each recommended upgrade.

Their team understands Denver's housing stock intimately — from 1890s brick Victorians in Capitol Hill to 1970s split-levels in Lakewood to 2010s production builds in Stapleton. Each era has characteristic energy weaknesses, and REenergizeCO's auditors know exactly where to look.

• Cost: $135 out-of-pocket (after Xcel subsidy)
• Service area: Denver metro, Front Range
• Certifications: BPI Building Analyst, Xcel Energy Certified
• Turnaround: Report delivered within 5-7 business days
• Best for homes: Xcel Energy customers, any age home, first-time audits

Energy Smart Colorado

Best for: Deep retrofit planning for older homes

Energy Smart Colorado approaches energy auditing as the first step in a comprehensive retrofit process. Their audits are more detailed than average, with particular attention to moisture dynamics, air sealing sequences, and insulation strategies that account for Denver's unique climate.

They excel with complicated older homes — the ones with multiple additions, mixed construction types, partially finished basements, and knob-and-tube wiring that limits insulation options. Their reports include phased improvement plans that prioritize upgrades in the correct order (air seal before insulate, insulate before upgrade HVAC).

• Cost: $150-$400 depending on scope
• Service area: Denver metro, Boulder, Longmont
• Certifications: BPI Building Analyst, RESNET HERS Rater
• Turnaround: 7-10 business days for full report
• Best for homes: Pre-1980 construction, planned renovations, complex layouts

Green Home Solutions Denver

Best for: Eco-focused homeowners planning comprehensive upgrades

Green Home Solutions combines energy auditing with sustainability consulting. Their audits go beyond standard efficiency metrics to include embodied carbon considerations, indoor air quality testing, and electrification planning for homeowners looking to transition off natural gas.

For Denver homeowners considering a full electrification path — heat pump HVAC, heat pump water heater, induction cooking — their audit framework maps out the optimal sequence and sizing. They account for altitude effects on heat pump performance (a real factor at 5,280 feet) and can model utility cost impacts of switching from gas to electric.

• Cost: $250-$500
• Service area: Denver metro
• Certifications: BPI, LEED AP, RESNET
• Turnaround: 10-14 business days for comprehensive report
• Best for homes: Electrification candidates, sustainability-focused homeowners

Denver-Specific Tips

Xcel Energy rebates are the headline: At 60% subsidy on audit costs, there's no reason not to use an Xcel-certified auditor. After the audit, Xcel offers additional rebates of $300-$2,000+ for recommended insulation, air sealing, and equipment upgrades. The rebate program has been renewed through at least 2027.

Altitude matters for combustion: Denver's lower air pressure means gas appliances need specific altitude adjustments. An auditor who doesn't check combustion efficiency and CO levels at altitude is missing a critical safety and efficiency factor. Make sure your auditor performs combustion analysis — not all of them do.

Timing tip: Late fall (October-November) is ideal for Denver audits. Heating season has begun, creating the temperature differential needed for accurate blower door and thermal imaging tests. It also gives you time to schedule improvements before the coldest months hit.

Watch for: Ice dam history (indicates attic air leakage and insulation gaps), basement rim joist air sealing (the #1 cost-effective improvement in most Denver homes), and furnace sizing (oversized furnaces short-cycle, reducing efficiency and comfort).

If you're considering heat pumps as part of your post-audit upgrade plan, our Heat Pump Guide covers types, costs, and real-world energy savings across different climates.

Best Home Energy Auditors in Seattle

Seattle's mild but relentlessly damp marine climate creates energy challenges that differ sharply from both Phoenix and Denver. Heating is the primary energy cost, but it's a moderate, sustained load rather than an extreme one. Moisture management is critical — incorrect insulation or air sealing strategies can trap moisture in wall cavities, leading to mold and structural damage.

The Pacific Northwest also has the cheapest electricity in the nation (thanks to hydropower), which changes the economic calculus. Savings per improvement are smaller in dollar terms, making it especially important to target the highest-impact upgrades first.

Simplicity Home Energy

Best for: First-time audits and straightforward assessments

Simplicity lives up to their name. They've built a strong reputation for making the energy audit process accessible and non-intimidating for homeowners who've never been through one. Their auditors explain findings in plain language, avoid upselling, and deliver reports that homeowners can actually act on.

Their standard audit includes blower door testing, thermal imaging, insulation assessment, and a prioritized improvement list with estimated costs and payback periods. They're transparent about what's worth fixing and what isn't — a valuable quality when Seattle's low electricity rates mean some upgrades take 15+ years to pay back.

• Cost: $250-$500
• Service area: Seattle, Eastside, South King County
• Certifications: BPI Building Analyst
• Turnaround: Reports within 5-7 business days
• Best for homes: Post-1950 construction, first-time audits

Trius Home Performance

Best for: Complex older homes and moisture-sensitive projects

Trius specializes in the kind of homes Seattle is full of — 1920s Craftsman bungalows, 1940s Cape Cods, 1960s ramblers with additions, and mid-century modern gems with single-pane everything. These homes require auditors who understand how moisture moves through wall assemblies and can recommend improvements that won't create condensation problems.

Their assessments go deeper on moisture dynamics than most competitors. They evaluate vapor barriers, ventilation rates, and wall assembly compositions before recommending any air sealing work. In Seattle's climate, an aggressive air seal without proper ventilation planning can cause moisture to accumulate inside walls — exactly the opposite of what you want.

• Cost: $300-$600
• Service area: Greater Seattle, Tacoma, Olympia
• Certifications: BPI Building Analyst, Building Envelope Specialist
• Turnaround: 7-10 business days
• Best for homes: Pre-1980 construction, homes with moisture issues, planned renovations

Sage Conservation

Best for: Data-driven homeowners who want granular analysis

Sage Conservation takes an engineer's approach to home energy auditing. Their reports include detailed calculations, modeling outputs, and scenario comparisons that let you evaluate different upgrade packages against each other. If you want to know whether $5,000 in attic insulation or $5,000 toward a heat pump delivers better lifetime value, Sage will model both scenarios.

They also offer monitoring recommendations — suggesting specific smart thermostats, energy monitors, and data logging setups that let you track performance improvements after completing upgrades. For the analytically minded homeowner, this level of detail is exactly what's needed.

• Cost: $350-$600
• Service area: Seattle, Bellevue, Redmond, Kirkland
• Certifications: BPI, RESNET HERS Rater, PE (Professional Engineer on staff)
• Turnaround: 10-14 business days for full modeling report
• Best for homes: Homeowners planning $10K+ in upgrades, data-driven decision makers

Seattle-Specific Tips

Puget Sound Energy (PSE) and Seattle City Light programs: PSE offers rebates up to $500 for insulation upgrades and $1,000+ for heat pump installations identified through audits. Seattle City Light provides Home Energy Assessments and connects customers with approved contractors. Check your utility's current program before booking — the landscape shifts annually.

Moisture is everything: Never hire a Seattle energy auditor who doesn't discuss moisture management as part of their air sealing recommendations. The Pacific Northwest building science community has documented countless cases of well-intentioned air sealing that caused mold growth because ventilation wasn't addressed simultaneously.

Timing tip: Schedule audits between November and March when the temperature differential between inside and outside is greatest. Seattle's mild summers (65-78°F) don't create enough delta for reliable thermal imaging of heating-season performance.

Watch for: Crawlspace moisture and insulation condition (Seattle's high water tables make this critical), single-pane wood windows (common in pre-1970 homes — sometimes repairable, sometimes replacement is warranted), and bathroom/kitchen exhaust that vents into the attic instead of outside (extremely common and a major moisture source).

How to Choose the Right Energy Auditor: 7 Criteria That Matter

Not all auditors are equal. Here's how to evaluate them before you commit.

1. BPI Certification Is Non-Negotiable

The Building Performance Institute (BPI) certification is the industry standard. A BPI Building Analyst has demonstrated competency in whole-house diagnostics, blower door testing, combustion safety, and building science fundamentals. If an auditor isn't BPI-certified (or holds an equivalent credential like RESNET HERS Rater), keep looking.

2. Diagnostic Equipment, Not Just a Clipboard

A real audit requires a blower door, infrared camera, combustion analyzer, and duct leakage testing equipment. Ask what tools they bring. If the answer is "a flashlight and a checklist," you're paying for a walkthrough, not an audit. The equipment alone costs $10,000-$15,000 — auditors who invest in proper tools take the work seriously.

3. Independence From Contractors

The best audits come from auditors who don't profit from selling you the fix. That doesn't mean contractor-auditors are all bad — many do excellent work. But when the person diagnosing the problem also sells the solution, there's inherent bias. If you use a contractor-auditor, get a second quote on any recommended work exceeding $2,000.

4. Local Climate Knowledge

Building science principles are universal. Application is local. An auditor who understands Phoenix's radiant heat dynamics, Denver's altitude effects on combustion, or Seattle's moisture management requirements will deliver recommendations that actually work in your climate. Ask how long they've been auditing homes in your specific metro area.

5. Report Quality

Request a sample report before booking. Good reports include: blower door test results with context, thermal images with annotations, prioritized improvement list with estimated costs and savings, applicable rebate information, and a clear explanation of findings. Bad reports are a two-page summary with vague recommendations like "consider adding insulation."

6. Utility Program Participation

Auditors who participate in local utility rebate programs (like Xcel Energy in Denver or PSE in Seattle) understand the paperwork, qualification criteria, and rebate maximization strategies. They can often save you hundreds of dollars just by structuring the work to qualify for available incentives.

7. Reviews and References

Check Google Reviews, Yelp, and Angi for recent feedback. Pay attention to reviews that mention specific findings — they indicate thoroughness. Be cautious of auditors with fewer than 20 reviews or ratings below 4.5 stars. Ask for references from homes similar to yours in age, size, and construction type.

Cost Comparison: What You'll Pay in Each City

Energy audit costs vary by city, home size, and scope. Here's what to expect in 2026.

Phoenix Audit Costs

Phoenix audit costs are moderate. SRP's free Home Energy Savings Review is worth doing as a first step, but don't confuse it with a diagnostic audit. The free review identifies obvious issues; a paid audit quantifies them and reveals hidden problems.

Denver Audit Costs

Denver is the clear winner on cost thanks to Xcel Energy's 60% subsidy. At $135 out-of-pocket for a comprehensive audit, there's no city in the country where professional energy assessment is more accessible.

Seattle Audit Costs

Seattle audit costs are the highest of the three cities, reflecting the region's higher labor costs and the additional moisture analysis that's standard practice in the Pacific Northwest. The investment is still worthwhile — a $400 audit that identifies $300/year in savings pays for itself in under 18 months.

For the full national picture on audit pricing, see our Energy Audit Cost breakdown.

What to Do After Your Audit: Turning Results Into Savings

The audit itself saves you nothing. It's what you do with the findings that counts. Here's the typical priority order for improvements across all three cities.

Priority 1: Air Sealing (ROI: 200-500%)

Air sealing is almost always the highest-ROI improvement. Typical cost: $500-$2,000 for a professional air seal. Typical savings: $150-$400/year. Common targets include attic penetrations (recessed lights, plumbing vents, electrical chases), rim joists in basements and crawlspaces, and duct connections.

Priority 2: Insulation Upgrades (ROI: 100-300%)

After sealing air leaks, adding or upgrading insulation locks in the gains. Attic insulation is the easiest and cheapest — blown cellulose or fiberglass over existing insulation can bring an R-19 attic to R-49 for $1,500-$3,000. Wall insulation is more expensive ($3,000-$8,000 for blown-in) but can be transformative for pre-1980 homes.

Priority 3: Duct Sealing and Insulation (ROI: 150-400%)

Duct sealing is especially impactful in Phoenix, where leaky ducts in 150°F attics waste massive amounts of energy. Professional duct sealing costs $500-$1,500 and can reduce cooling costs by 15-25%. In Denver and Seattle, duct improvements are less dramatic but still worthwhile.

Priority 4: Equipment Upgrades (ROI: 50-150%)

New HVAC equipment, water heaters, and smart thermostats come last — after the building envelope is tight. Installing a high-efficiency heat pump in a leaky house is like buying a sports car with flat tires. Fix the building first, then size and install equipment based on the reduced load.

Our Complete Guide walks through every step of the home efficiency improvement process from audit through final verification.

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?

A thorough professional audit takes 2-4 hours for a typical single-family home (1,500-2,500 sq ft). Larger homes, older homes, or homes with complex layouts may require 4-6 hours. Be wary of auditors who promise comprehensive results in under 90 minutes — they're likely skipping diagnostic tests. The report typically arrives 5-10 business days after the on-site visit.

Are home energy audits worth the cost?

Yes, for the vast majority of homeowners. The Department of Energy reports that professional audits identify an average of $200-$800 in annual energy savings opportunities. At a typical audit cost of $200-$500 (and as low as $135 in Denver with Xcel subsidies), the payback period is often under two years. The audit also prevents you from wasting money on upgrades that won't deliver meaningful savings — which is arguably even more valuable than the savings it identifies.

Can I get a free home energy audit?

Some utilities offer free basic energy assessments. SRP in Phoenix provides free Home Energy Savings Reviews. Seattle City Light and PSE offer subsidized assessments for qualifying customers. However, these free programs are typically visual walkthroughs — not diagnostic audits with blower door testing and thermal imaging. Think of them as screening visits. They can identify obvious issues but won't catch the hidden problems that often represent the biggest savings opportunities.

What's the difference between a home energy audit and a HERS rating?

A home energy audit is a diagnostic assessment focused on identifying specific problems and recommending cost-effective improvements. A HERS (Home Energy Rating System) rating assigns a numerical score to your home's energy performance on a standardized scale. New code-built homes score around 100; a net-zero home scores 0. HERS ratings are required for some real estate transactions, green certifications, and utility programs. Many auditors can provide both, but a HERS rating typically costs $100-$300 more than a standard audit.

Should I get an energy audit before or after buying a home?

Before, if possible. Some buyers include an energy audit as part of their due diligence alongside the general home inspection. The audit results can inform negotiations — a home with R-11 attic insulation and 15 ACH50 air leakage has $5,000-$10,000 in efficiency upgrades ahead of it, and that's worth knowing before you close. In Denver's competitive market, buyers often waive inspections to win bids, but if you have the opportunity, a pre-purchase energy audit is enormously valuable for budgeting post-close improvements.

Related Reading

• Energy Audit Cost — Full breakdown of what you'll pay for a home energy audit in 2026, including utility rebates and tax credits.
• Audit vs DIY — What you can assess yourself versus what requires professional equipment and expertise.
• Complete Guide — The comprehensive walkthrough of every home energy efficiency improvement, from audit through final verification.
• Heat Pump Guide — Types, costs, and real energy savings data for heat pumps across different climates.

-- The Efficiency Team