HVAC Quote Comparison Checklist: Compare Bids on the Same Job
By the Superior Air team · CSLB #669421 · Updated September 22, 2026
Key points
Why quotes are hard to compare
Two HVAC quotes for "replacing the AC" can differ by thousands of dollars and still both be honest, because they can describe entirely different scopes of work under the same one-line description. The fix isn't finding the lowest number; it's forcing every quote to state the same categories of information so you're actually comparing the same job. This checklist is that list, in the order that matters most.
The checklist
| Factor | What to look for | Why it matters |
|---|---|---|
| License number | A C-20 HVAC license number you can verify at cslb.ca.gov, matching the business name on the quote | |
| Model numbers | Outdoor unit, indoor coil, and furnace or air handler, each with a specific model number, not a category like "a 16 SEER system" | |
| Certified ratings | SEER2 and EER2 for the matched pair; HSPF2 for heat pumps; AFUE for furnaces, as certified for that specific combination | |
| Load calculation | Confirmation a Manual J was run on your house, not the old unit's tonnage copied forward | |
| Duct scope | Whether ducts are tested, sealed, modified or replaced, and what happens if a leakage test fails | |
| Electrical scope | Disconnect, whip, breaker size, and any panel work, itemized rather than assumed | |
| Refrigerant and line set | Refrigerant type and whether the line set is replaced or flushed, since old oil residue can damage new A2L equipment | |
| Energy-code testing | Third-party duct and refrigerant verification named on the proposal where the project requires it | |
| Warranty terms | Workmanship warranty length plus the manufacturer parts warranty terms for the specific equipment quoted, in writing | |
| Payment terms and schedule | What's removed, what's installed, expected duration, and payment structure; California limits the down payment on a home improvement contract to $1,000 or 10%, whichever is less |
How to use it
- Get each quote in writing, not verbally over the phone. A firm price without a home visit is itself worth noting as a caution sign; see our contractor guide for the full reasoning.
- Fill in the checklist for each quote. Any blank row is a question to ask before you compare price.
- Match scope before you compare price. If one quote includes duct sealing and another doesn't, that's a real difference in what you're buying, not a coincidence of pricing.
- Confirm the equipment is a certified matched pair, not just an outdoor unit and an indoor coil sold separately at their individual ratings.
- Compare warranty terms specifically, since they vary by brand and by installer, not just by price.
- Then, and only then, compare the bottom line.
Common ways a lower quote hides a smaller job
- No load calculation. Sizing copied from the old unit carries forward whatever mistake was made when it was first installed.
- Reused line set with no mention of it. New A2L refrigerants shouldn't be paired with old oil residue from a prior R-410A or R-22 system.
- No duct testing mentioned. California's energy code requires it on most changeouts; skipping the conversation about it doesn't skip the requirement.
- Vague equipment description. "A 3-ton 16 SEER system" names a category, not a product. Ask for the actual model numbers.
- No warranty terms in writing. A verbal warranty is not a warranty once the crew has left.
Once you've compared
The lowest complete quote, one that fills in every row above with a real answer, from a licensed contractor, is a reasonable choice. The lowest quote with blank rows usually isn't a bargain; it's a smaller, undefined job wearing the same label as the others. When you're ready for a written quote to run through this checklist, schedule a consultation or read what Superior Air's own proposals include.