Top-Rated Home Energy Auditors in Cambridge, MA
15 local auditors ranked by 582 Google reviews. Free to compare, no sign-up.
Short answer: The top-rated home energy auditors in Cambridge are Home Energy Efficiency Consultants (5.0★, 90 reviews), A9 Green / Total Green Energy Solution, LLC (5.0★, 80 reviews), C2S Energy (4.9★, 191 reviews).
Home energy auditors in Cambridge, ranked
- 5.0 (90 Google reviews)519 Broadway, Somerville, MA 02145
- 5.0 (80 Google reviews)329 Massachusetts Ave, Lexington, MA 02420
- C2S EnergyMost reviews4.9 (191 Google reviews)513 Church St, New Bedford, MA 02745
- 4.9 (63 Google reviews)180 State Rd Unit 2U, Sagamore Beach, MA 02562
- 5.0 (28 Google reviews)65 Newburyport Turnpike, Newbury, MA 01951
- 5.0 (17 Google reviews)575 Washington St #2c, Canton, MA 02021
- 4.8 (25 Google reviews)89 Turnpike Rd, Ipswich, MA 01938
- 4.7 (19 Google reviews)184 Riverview Ave, Waltham, MA 02453
- 5.0 (5 Google reviews)271 Waverley Oaks Rd, Waltham, MA 02452
- 5.0 (4 Google reviews)90 Brookline St, Worcester, MA 01603
- 5.0 (2 Google reviews)84 Topsfield Rd, Ipswich, MA 01938
- 5.0 (2 Google reviews)45 Franklin St 4th Floor, Boston, MA 02110
- 5.0 (1 Google reviews)2 Woodlawn St, Amesbury, MA 01913
- 4.3 (27 Google reviews)555 Virginia Rd, Concord, MA 01742
- 4.3 (28 Google reviews)55 Linden St, Worcester, MA 01609
Every company here is on RESNET's 2026 list of HERS rating companies and has an office within 80 km of Cambridge. See every home energy auditor we list, rated or not. Check your utility's own assessment before you pay for an audit.
Together these 15 companies average 4.9★ across 582 reviews. C2S Energy has the most reviews (191).
Ranked by Google rating weighted by review count, collected October 2026. Rankings are not paid for. How we rank and how we make money.
Are you one of the home energy auditors in Cambridge? These are yours to use with clients:
- A rebate calculator for your website. Clients answer a few questions and see the rebates they can stack. Get the embed code.
- A one-page Cambridge rebate sheet to print or email to clients, with every open program, the main rule and the official source. Open the rebate sheet.
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What a home energy audit costs in Cambridge
Some utility programs pay for the assessment. Ask each auditor for the price of the audit and any test-out visit after the work, so you can compare.
Check whether each one needs an energy assessment or pre-approval before work starts. That could cut your cost by up to $16,000 if you qualify. Most rebates have rules (income, your current heating, a registered contractor, approval before work starts).
Rebates: our verified program data, checked monthly. Always confirm the exact amount for your home.
What a home energy audit covers in Cambridge
A home energy auditor visits your home and finds where it wastes energy. Most test how much air leaks out with a blower door, check insulation in the attic, walls and basement, and look at your heating, cooling and hot water. You get a report that lists upgrades in order of value.
If your program needs an audit, book it first. Some utility insulation and air sealing programs pay only after an assessment, and some need it before any work starts. Ask your utility whether an outside auditor's report counts, or whether you must book through the program.
In Massachusetts, Mass Save offers a no-cost home energy assessment, in person or virtual, for homeowners, renters and landlords. It unlocks Mass Save's insulation and air sealing incentives, and income-qualified homes can get insulation, air sealing and heat pumps at up to no cost. Call 866-527-7283 or book on the Mass Save site. An independent auditor can still help you plan bigger projects.
Source: Mass Save Home Energy Assessments.
Before you hire a home energy auditor
- Ask whether they are BPI certified or a RESNET HERS rater, and whether they run a blower door test.
- Ask whether your utility's insulation or heat pump program accepts their report, or whether you must book through the program.
- Ask what the audit costs, what the report includes, and whether a test-out visit after the work costs extra.
- Ask whether they also sell or install upgrades. An auditor who does not sell gives the most neutral advice.
Questions about home energy auditors in Cambridge
Who is the best home energy auditor in Cambridge?
Based on Google reviews, the top-rated home energy auditors in Cambridge are Home Energy Efficiency Consultants (5.0★, 90 reviews), A9 Green / Total Green Energy Solution, LLC (5.0★, 80 reviews), C2S Energy (4.9★, 191 reviews). We rank by a review-weighted score, so companies with many strong reviews rank above those with only a few.
How are the home energy auditors in Cambridge ranked?
We list 15 home energy auditor companies in Cambridge, ranked by Google rating weighted by review count. Together they have 582 Google reviews and average 4.9 stars, collected October 2026. C2S Energy has the most reviews (191). No company pays to be listed or ranked.
How much does a home energy audit cost in Cambridge?
Prices vary by auditor and by the size of your home. Some utility programs pay for the assessment. Ask each auditor for the price of the audit and any test-out visit after the work.
Are there rebates for home energy upgrades in Cambridge?
Yes. Our verified program data shows heat pump rebates up to $16,000 open in Cambridge. Check whether each one needs an energy assessment before work starts. Most rebates have rules, such as income, your current heating, a registered contractor, or approval before work starts, so check the rebate page before you sign.
Do I need an energy audit before I upgrade in Cambridge?
If your program needs an audit, book it first. Some utility insulation and air sealing programs pay only after an assessment, and some need it before any work starts. Ask your utility whether an outside auditor's report counts, or whether you must book through the program. In Massachusetts, Mass Save offers a no-cost home energy assessment, in person or virtual, for homeowners, renters and landlords. It unlocks Mass Save's insulation and air sealing incentives, and income-qualified homes can get insulation, air sealing and heat pumps at up to no cost. Call 866-527-7283 or book on the Mass Save site. An independent auditor can still help you plan bigger projects.
What should I ask a home energy auditor before I hire?
Ask whether they are BPI certified or a RESNET HERS rater, and whether they run a blower door test. Ask whether your utility's insulation or heat pump program accepts their report, or whether you must book through the program. Ask what the audit costs, what the report includes, and whether a test-out visit after the work costs extra.
Before you call anyone, check what home energy auditor rebates you can get in Cambridge. Many programs require approval or a registered contractor before work starts.
Planning more upgrades? See the top-rated heat pump installers, home battery installers in Cambridge.
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