Ask every installer the same 15 questions.
Install quality determines heat pump performance more than the brand on the box. These questions find the installers who know that — bring them to every walkthrough.
The installer is the product
A mid-tier heat pump installed well outperforms a premium one installed badly — sizing, refrigerant charge, airflow, and line-set work are where systems succeed or fail. You can't inspect those skills directly, but you can ask questions whose answers reveal them. Same questions, every contractor, written answers where it matters. The differences will be obvious.
Fifteen questions, five groups
Print this, or keep it open on your phone during the walkthrough.
Sizing
- → Will you do a Manual J load calculation, and can I see it?
- → Will you size for the house as it is, or account for the envelope work I'm planning?
- → What's the design temperature you're sizing against?
Square-footage sizing is the single biggest quality filter. A contractor who sizes by rule of thumb is guessing with your money.
Cold-weather design
- → What's this system's capacity at our design temperature — not the nameplate rating?
- → What's the balance point, and what carries the house below it?
- → How many cold-climate installs have you done, and can I talk to a winter reference?
Rated capacity is measured at 47°F. What matters is what the unit delivers on your coldest night, and whether backup (if any) is deliberate or a crutch.
Scope
- → What exactly is included — electrical work, condensate, line-set cover, thermostat, permits, old-equipment disposal?
- → Is a panel or circuit upgrade needed, and is it in this price?
- → Who pulls the permit, and is the final inspection included?
Most quote-to-quote price differences are scope differences. Pin the line items now or discover them as change orders later.
Rebates
- → Are you registered with the state and utility programs here?
- → Who files the rebate paperwork — you or me?
- → Which of the rebates you're quoting have you confirmed are currently open?
Many programs pay only for work by registered contractors, and some rebates in circulation are expired or not yet launched in your state. A good contractor knows the programs cold.
Commissioning and after
- → Will you verify refrigerant charge and airflow at startup, and give me the numbers?
- → What's your labor warranty, separate from the equipment warranty?
- → Who registers the equipment warranty, and by when?
Install quality shows up in the commissioning numbers. A contractor confident in their work hands them over without being asked twice.
Answers that mean keep shopping
"We size by square footage — always works."
The definitional red flag. No load calculation, no bid.
"You don't need a permit for this."
You usually do, and unpermitted work surfaces at rebate time and resale.
Vague line items, big round numbers.
Scope hiding. Compare against what belongs on a quote.
Rebate promises that sound too good.
Some contractors still pitch expired federal credits or programs that haven't launched in your state. Verify on your state page before it's in your budget.
Walk in with your own numbers
You'll get more from every conversation if you arrive with a rough size from the sizing calculator, a sense of what drives installation prices, and your rebate stack from the Rebate Matcher. Contractors quote more carefully for customers who clearly know the terrain — and after you hire, what to expect during the work covers the milestones.
Hiring questions
How many quotes should I get for a heat pump?
Three is the standard advice, and it works — provided the scopes match. Bring the same questions to each walkthrough and insist each bid prices the same work; three quotes for three different scopes tell you nothing.
Should the contractor do a load calculation?
Yes, for any whole-home system. A Manual J is the industry-standard heat loss calculation, and 'we size by square footage' is the answer that should end the conversation. For a single-room mini-split the stakes are lower, but the good installers calculate anyway.
What certifications should a heat pump installer have?
NATE certification signals HVAC technical competence; BPI signals whole-house building-science thinking; manufacturer certifications (like Mitsubishi Diamond or Daikin Comfort Pro) unlock better warranties on those brands. None substitutes for cold-climate install experience and winter references.
Who applies for the rebates — me or the contractor?
It varies by program: some are point-of-sale discounts the contractor applies, others are homeowner applications after install. Ask who files what before you sign, and get it in the contract. Either way, keep every document — invoice, model numbers, permit — for the paperwork.
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