Quick Answer
Ten questions separate a real AC installation process from a box swap, and they group into four things you are actually confirming. Design questions confirm the company sizes equipment to your house rather than guessing. Accountability questions confirm who actually shows up and who owns the ductwork scope. Rebate and refrigerant questions confirm the quote reflects 2026 Mass Save rules rather than outdated ones. Completion questions confirm the job ends with proof, not just a running unit. Verify licensing and reviews first, then bring these questions to the companies that pass.
The Answer
Questions That Confirm A Real Design Process.
Three questions reveal whether a company designs your system or guesses its size. Will you run a Manual J load calculation, or size by square footage alone? Will the written estimate show two or three real system paths, or one number? Does the option sheet include the load, the equipment match, and the distribution plan? A company answering yes to a load calculation and showing real options in writing is doing the work a proper installation requires. A company quoting a single number over the phone skipped it.
Questions that separate a real design process from a box swap
Mass Save sizing bonus tied to documented Manual J work
Date R-410A equipment stopped qualifying for Mass Save
Questions That Confirm Installation Accountability.
Three questions reveal who actually does the work and who owns the scope. Who installs the system, the same team that measured the house or a subcontractor? Will you pull the required permit, or is that my responsibility? If ductwork needs sealing or modification, is that scoped in the estimate now or discovered during installation? A contractor asking you to pull your own permit is asking you to carry the liability they should hold. Ductwork scope belongs in the written estimate, not a surprise mid-project.
Questions That Confirm The Rebate And Refrigerant Path.
Two questions decide whether your quote reflects current Massachusetts incentives. Do you handle Mass Save eligibility and paperwork, or is that on me? What refrigerant does the equipment use, and does it appear on the Qualified Products List? R-410A equipment stopped qualifying for Mass Save rebates on January 1, 2026, and qualifying systems now run R-32 or R-454B. Net cost after rebate often reverses the sticker price comparison entirely, so any quote silent on rebate handling deserves a direct follow-up question before you compare it against another.
Questions That Confirm The Job Actually Finishes.
Two questions confirm the installation ends with proof, not just a running system. Will you commission the system and share the startup readings? What warranty applies to the equipment, and what warranty applies to your labor separately? Commissioning verifies refrigerant charge, airflow, and temperature split before the crew leaves. Manufacturer and labor warranties are two different documents, and a company that cannot separate them clearly has not thought through what happens if something fails in year three.
The 617 Standard
We wrote this list from our own install sheet, since every question here is one we answer before a homeowner asks it. Manual J runs on every project, and the written options show the load, the equipment match, and the distribution plan side by side. We pull our own permits. Mass Save eligibility and paperwork get handled as part of the design, not billed as an add-on. Commissioning readings get recorded and handed over at the walkthrough, and the manufacturer warranty and our labor coverage sit as separate, clearly stated terms. Ask any installer these ten questions, us included, and the answers tell you who is doing the work correctly.
Frequently Asked Questions
Technical clarification on system performance and diagnostics.
Do I need multiple quotes for an AC installation?
Yes, and comparing them fairly matters more than collecting them. Two or three written quotes based on the same Manual J load let you compare apples to apples. A quote based on a phone guess and a quote based on a measured load are not comparable, no matter how close the numbers look.
Is it a red flag if a contractor will not run a Manual J calculation?
Yes. Manual J sizes equipment to your actual rooms, and skipping it means the contractor is sizing from a rule of thumb or copying the old unit. Both approaches risk an oversized system that short cycles and removes humidity poorly, which shows up in comfort complaints long after the invoice is paid.
What if the estimate does not mention Mass Save rebates at all?
Ask directly before comparing prices. A quote silent on rebates may mean the contractor only priced a cooling-only path, which never qualifies, or simply left the incentive out of the number. Either way, the net cost after rebate can change which option is actually cheaper, and that math belongs in writing.
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