Compare quotes on the same lines, not just the bottom number: equipment brand and model, system size (backed by a real load calculation), what's included (ductwork, electrical, permits), warranty terms, and the true out-the-door total. The lowest and highest quotes are rarely the right comparison — scope and sizing are.
DefinitionWhat makes two quotes actually comparable?
Two quotes can differ by thousands and both be "fair" — because they're quoting different work. Before comparing price, line them up on these points so you're comparing apples to apples.
The line-by-line checklist
| Check this | What good looks like |
|---|---|
| Equipment | Specific brand + model (e.g., a named Mitsubishi system), not "a heat pump" |
| Sizing | Backed by a Manual J load calculation |
| Scope | Spells out ductwork, electrical, and removal/disposal |
| Electrical | Panel work only if truly needed (here's how to tell) |
| Permits | Pulled and managed by the contractor |
| Warranty | Labor + manufacturer terms in writing |
| Total price | Out-the-door, no surprise add-ons |
Red flags that mean slow down
- No load calculation — sizing by guesswork.
- "Sign today or lose the price" — manufactured urgency (often tied to a fake "2026 mandate"; see the real rules).
- Blanket panel-upgrade add-on with no justification.
- Vague scope — "we'll handle whatever comes up."
- No permit handling or unclear warranty.
The single best protection: a free second opinion from the owner. Send your quotes and Sam reviews scope, sizing, and price line by line — no obligation.
How to make the final call
Once quotes are normalized on the checklist, pick the one that's right-sized, fully scoped, permitted, and warrantied at a fair total — even if it isn't the absolute cheapest. Still torn on repair vs. a new system? See repair vs. replace. And verify a Mitsubishi installer's credentials with what is a Diamond Contractor.
ProofWhy this is in our DNA
Plum was built as the anti-pressure alternative: the owner quotes every job, the price we quote is the price you pay, and we'd rather lose a sale than oversell. That's exactly why we offer a free second opinion — we're confident an honest comparison works in your favor.
ActionYour next step
Holding two or more quotes? Send them for a free second opinion, or check current incentives on the Rebate Hub before you sign.
Educational checklist; specifics vary by project. Plum HVAC · CSLB #1087978 · Mitsubishi Electric Elite Diamond Contractor.
Educational guidance for Mountain View & Peninsula homeowners — not a formal quote. Every recommendation should be confirmed against your home's actual conditions during an in-home visit. Incentive amounts and program status change; verify current eligibility before you buy.
Quick answers
How do I compare HVAC quotes fairly?
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Put them side by side on the same lines: equipment brand and model, system size (backed by a load calculation), what's included (ductwork, electrical, permits), warranty terms, and the total out-the-door price. The cheapest and most expensive quotes are rarely the right comparison — scope and sizing are.
What are red flags in an HVAC quote?
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Watch for no load calculation, vague 'we'll figure it out' scope, high-pressure 'sign today' urgency, a blanket panel-upgrade add-on, missing permit handling, and unclear warranty terms. Any of these is a reason to slow down and get a second opinion.
Should I always pick the lowest HVAC quote?
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No. The lowest quote can hide a smaller scope, missing permits, or no load calc — and the highest isn't automatically the best either. Compare what each price actually buys. A free second opinion makes that comparison easy.
Repair vs. Replace: When to Fix and When to Upgrade
A simple, no-pressure framework — age, repair cost, and efficiency — to decide without getting upsold.
7 min read → LearnWhat Is a Mitsubishi Diamond Contractor?
What Elite Diamond status actually means for your install, your warranty, and the quality of the crew on your roof.
5 min read →