The contractor decision is worth more than the brand decision, and in 2026 it is worth more than ever, because the installer stands between you and the NHSaves rebate. A shop that installs beautifully and files carelessly can cost you $8,000 on a 4-ton job. A shop that sizes by guesswork can leave a North End colonial cold on the one night that matters. Here is how to run the vetting, question by question, with the answers a good Manchester shop gives without flinching.
Start with the sizing question
Ask: how will you determine the size of my system?
The only good answer describes a load calculation, a room-by-room accounting of your square footage, insulation, windows, and air leakage, run against the coldest weather Manchester actually sees, a design day sitting near 1F. The output is a heating load, and the load sets the tonnage.
The wrong answers are audible in seconds. Square-footage rules of thumb. Matching whatever the old system was. Eyeballing it from the driveway. Sizing is where undersized systems that lose the house in January and oversized systems that short-cycle themselves to death are both born, and it is also the number the rebate multiplies, since NHSaves pays $2,000 per ton in the enhanced window. A contractor guessing at tonnage is guessing with your comfort and your rebate at the same time.
Insist on seeing the calculation on paper with the proposal. Shops that do the math are proud to show it.
Test their program fluency
Ask: which qualifying cold-climate model are you proposing, and what does my rebate stack look like?
A current shop answers in specifics. The model and its listing on the qualifying equipment list. The tonnage times $2,000. The $650 New England Heat Pump Accelerator adder per outdoor unit. The $750 heat pump water heater rebate if that swap joins the project. The December 31, 2026 close of the enhanced tier. If your electric bill says Eversource, Liberty, or Unitil, the lane is the same statewide program; NH Electric Co-op members are on a separate schedule the shop should also know cold. The full stack is laid out in our Manchester rebates guide if you want to walk in already knowing the answers.
One more spec-sheet tell: current qualifying equipment runs on R-454B, and an installer should name that refrigerant standard unprompted. A shop pushing older-refrigerant stock is pushing equipment the program has moved past, at your expense.
Is a federal tax credit on the quote a red flag?
Yes, and it is the loudest one available in 2026. The federal 25C and 25D credits expired on December 31, 2025, and the HEAR program is gone with them. Any proposal that still uses federal credits to sweeten its math is built on money that no longer exists. Treat it as a free diagnostic: the shop has not updated its playbook in over a year, and you should read every other number in that proposal with the same suspicion. The entire 2026 incentive stack is state and utility money, and a good contractor says so plainly.
Confirm the license and the network
New Hampshire heat pump work belongs to licensed professionals, and several utilities steer rebate-eligible jobs toward their network contractors. Both facts have teeth: an unlicensed install can void the rebate claim outright, and network membership usually means the shop has filed enough NHSaves paperwork to do yours in its sleep. Ask directly whether the shop is in the utility's network and how many NHSaves claims it filed last year. A number, even a modest one, beats a vague yes.
Ask who floats the rebate
NHSaves pays downstream, after installation. Some shops make you pay in full and wait for the check. Established ones discount the invoice up front and collect the reimbursement themselves. Neither model is wrong, and on a Hallsville two-family where the stack reaches $8,650, knowing which one you signed up for is the difference between a smooth project and an unpleasant surprise at the final invoice. Get it in writing.
Compare quotes like an adjuster, not like a shopper
Collect three proposals and line them up on scope rather than price.
| Compare on | What good looks like | What a red flag looks like |
|---|---|---|
| Load calculation | On paper, referencing design conditions | Tonnage with no math behind it |
| Equipment | Named qualifying cold-climate model | "Equivalent" or unnamed equipment |
| Rebate handling | Line-itemed, model stated in writing | "We'll help with paperwork" and nothing else |
| Scope | Electrical, condensate, old-system removal itemized | Bare equipment-and-labor line |
| Commissioning | Documented performance verification included | Silence on the subject |
The cheapest quote usually earned its position by omitting something in that table. The most expensive one sometimes earned its position with a longer warranty and a fuller scope. You cannot tell from the bottom line, which is why the bottom line is the last thing worth reading. Gross pricing context by system type lives in our installation cost guide.
Weigh local experience over everything portable
A crew that has worked winters from Rimmon Heights plaster walls to Bedford NH new builds has already met your house's problems. They know the two-family stock in Bakersville needs condensate routing that survives a deep freeze, that Straw-Smyth capes hide their duct potential in the attic, and that a Goffstown install scheduled for December is a gamble against the calendar. Ask what they have installed within a few miles of you and whether you can talk to one of those owners. Shops with local history hand over references happily.
Equipment questions belong in the conversation too, and our guide to the best heat pumps for Manchester cold arms you with the spec-sheet numbers worth asking about, capacity at 5F above all.
The commissioning finish line
The install is done when the performance is proven, and the proof is called commissioning: refrigerant charge verified, airflow checked, output measured against the spec. Ask every bidder whether commissioning is included and documented. The report matters twice, once because it catches installation errors while the crew is still in your driveway, and again because it belongs in your rebate paperwork. A shop that shrugs at commissioning is telling you where its standards sit.
Vetting takes an afternoon and protects five figures. The shortcut to the same protection is starting with quotes that already carry the program math. Get a free quote in about two minutes, free and no obligation, sized to your actual house and priced with every NHSaves dollar your address qualifies for.