Why 9 Questions (Not 3 Quotes) Decides This
The standard advice for any contractor decision is "get 3 quotes." For heat pumps in Massachusetts, that produces the wrong answer most of the time — three contractors at the same headline price routinely deliver three different installations, with two of them missing $4,000-$8,000 in Mass Save rebate filing because of incomplete paperwork.
The 9-question vetting method below catches the gaps that price comparison can't see. Walk it on every quote conversation. Real Mass Save HPC contractors answer all 9 in under 4 minutes. Operators stall on 3 or more.
The 9 Questions, In Order
Ask these in this sequence. Each question's answer informs whether the next question is worth asking.
Total time: PT15M
- Step 01
What's your Mass Save HPC ID number?
Real Mass Save Heat Pump Contractors are listed in the Mass Save authorized contractor database with a numeric HPC ID. Real ones say it without hesitation. Operators stall, deflect to 'we work with Mass Save,' or quote a generic Mass Save program webpage. Verify the number on the spot at masssave.com/find-a-contractor. - Step 02
What AHRI Reference Number is on the proposal?
The AHRI Reference Number is the matched-pair certification for the indoor coil + outdoor condenser combination being quoted. Mass Save rebate filing requires it in writing. Real contractors include it on the proposal automatically. If the response is 'we'll add that later,' the install will fail rebate verification. - Step 03
Is Manual J load calculation included free?
ACCA Manual J 8th Edition is the residential heating/cooling load standard. Mass Save requires Manual J on every authorized install. Real contractors include the calc free, deliver the printout to the homeowner, and use it to size the system. 'Manual J is $400 extra' = the contractor isn't running it themselves and is hoping to subcontract. - Step 04
What refrigerant does the proposed system use?
2026 Mass Save rebate-eligible systems use R-32 or R-454B refrigerant only. R-410A was phased out for new manufacturing under the federal AIM Act. If the bid says 'R-410A' or doesn't specify the refrigerant, the install will fail rebate verification — even after the equipment is in your basement. - Step 05
Can I see your last 3 Mass Save filings?
Authorized HPC contractors file dozens of Mass Save rebates per year. Real ones can show recent confirmations (with homeowner names redacted). Operators deflect. The volume of recent filings is the best proxy for whether they actually know the program. - Step 06
What's your MA CSL or HIC license number?
Massachusetts Construction Supervisor License (CSL) is required for any structural work; Home Improvement Contractor (HIC) registration is required for any project over $1,000. Both are searchable in the state's database in 30 seconds. Pro Build holds both; ask any contractor for both numbers and verify. - Step 07
Are you carrying $1M+ general liability insurance?
Heat pump installs involve electrical, refrigerant handling, and structural work. $1M general liability is the MA market minimum. Workers comp is required by law for any contractor with employees. Ask for the certificate of insurance (COI) — real contractors have one ready. - Step 08
What's your written workmanship warranty?
Manufacturer warranty on the equipment (Mitsubishi 12-year, Fujitsu 10-year, Bosch 10-year) is separate from the contractor's workmanship warranty. Real Mass Save HPC contractors offer 5-15 year workmanship warranties in writing. 'We stand behind our work' without a written term means no warranty. - Step 09
How is the rebate filed and when does it arrive?
Real HPC contractors file Mass Save rebates within 30 days of install. Rebate check arrives 6-10 weeks from post-install verification. The filing is on the contractor's account, not the homeowner's. Operators say 'you file it' or 'we'll help you file it' — both signal they're not actually authorized.
How To Verify Each Answer
Each of the 9 answers has a free public verification path. None take more than 2 minutes:
- Mass Save HPC ID
- masssave.com/find-a-contractor — search by ZIP, the contractor's HPC ID is shown.
- AHRI Reference Number
- ahridirectory.org — paste the cert number, see the matched-pair specifications.
- MA CSL
- mass.gov → Office of Public Safety, search Construction Supervisor License database.
- MA HIC
- mass.gov → Office of Consumer Affairs, search Home Improvement Contractor registry.
- Insurance COI
- The certificate names the carrier; call the carrier directly to verify policy is current.
The 5 Hardest Red Flags To Walk Away From
If a contractor's quote is 15-25% lower than the others, the savings almost always come from skipping items below. Walking away is harder when the price is appealing — but the missing items cost more than the discount.
- No HPC ID on file: The Mass Save rebate ($10K-$16K) won't be filed correctly. Loss: $6K-$10K.
- No AHRI number on proposal: Equipment isn't a verified matched pair. Manufacturer warranty drops to unmatched-component clause.
- Manual J as a paid add-on: Sizing comes from a brochure, not a calc. System short-cycles, fails Mass Save post-install verification.
- R-410A refrigerant: Pre-2026 inventory dump. Rebate filing rejected.
- Verbal-only warranty: Workmanship warranty isn't enforceable without written terms.
Frequently Asked Questions
How long does Mass Save HPC verification take?
30 seconds at masssave.com/find-a-contractor. Type your ZIP code, and the authorized contractor list shows HPC ID numbers and contact info. If the contractor you're quoting isn't on the list, they're not authorized — full stop.
What if I already signed and the contractor is missing items?
Massachusetts Home Improvement Contractor law gives you 3 business days to cancel any home improvement contract over $25 (per MGL c. 93 §48). Use it. After 3 days, your options narrow to negotiation or filing a complaint with the MA Attorney General's Consumer Protection division.
Can a contractor file a Mass Save rebate without being an authorized HPC?
No. Mass Save rebate filing requires the contractor to be on the authorized HPC list. Non-HPC contractors who promise to 'help with the filing' typically subcontract the install (or the filing) to a real HPC, taking a margin in the middle and exposing you to coordination risk.
What's the difference between MA CSL and HIC?
Construction Supervisor License (CSL): required for structural work, framing, additions. Home Improvement Contractor (HIC): required for any home improvement project over $1,000. Most reputable contractors hold both. Pro Build holds both.
Does the heat pump contractor handle the electrical permit?
If the install requires a panel upgrade or new circuit (most full heat pump installs do), the electrical work must be performed by a licensed Massachusetts electrician with their own 527 CMR permit. Real HPC contractors coordinate this in-house or via a documented partnership; the homeowner shouldn't need to manage two separate trades.
Is a longer warranty always better?
Not necessarily. A 25-year workmanship warranty from a 2-year-old contractor is worth less than a 5-year workmanship warranty from a 15-year-old contractor with a verifiable track record. Look at warranty length AND business tenure together.
How many quotes should I actually get?
Three is the standard. Skip contractors who fail any of the first 4 of the 9 questions before generating a quote — that filters out 50-70% of operators upfront and makes your final 3 comparisons meaningful.
What does the average Pro Build heat pump quote look like in MA?
AHRI Reference Number on page 1 · Manual J printout attached · R-454B equipment specified · Mass Save filing line item ($10K-$16K depending on income tier) · 15-year workmanship warranty in writing · MA CSL + HIC + HPC ID printed in footer. Free, in 24 hours, no pressure.
References & Sources
- Mass Save authorized contractor directory. https://www.masssave.com/find-a-contractor
- AHRI Directory of Certified Product Performance. https://www.ahridirectory.org/
- Massachusetts CSL search database. https://elicensing21.mass.gov/CitizenAccess/
- MGL c. 93 §48 — Home Solicitation Sale 3-day cancellation rule. https://malegislature.gov/Laws/GeneralLaws/PartI/TitleXV/Chapter93/Section48
