How to read an HVAC quote, line by line

A complete replacement quote lists the model number of every major component, the AHRI certificate number for the matched system, capacity backed by a load calculation, SEER2, EER2, HSPF2 or AFUE ratings, the refrigerant, the permit, labor and materials included, parts and labor warranty terms, and a payment schedule. Missing model numbers or a missing permit are red flags.

Start with the equipment

The equipment is the largest line on the quote and the one most often left vague. “Brand X 3-ton 16 SEER2 system” describes a product family, not something you can check. Ask for the full model number of every major piece: the outdoor unit (air conditioner or heat pump), the indoor coil, and the furnace or air handler. With model numbers you can compare quotes like for like and look up the ratings yourself.

Split systems are rated as matched sets. The AHRI Directory lists certified combinations of outdoor unit, indoor coil and furnace or air handler, each with a Certified Reference Number, a rated capacity and efficiency ratings. Ask for that number or the AHRI certificate. Many utility rebate programs require it, and some building departments ask for it with the permit application.

Labor, materials and the smaller lines

Lines outside the equipment are where quotes quietly differ. One contractor includes a new line set and pad; another reuses the old ones and comes in lower. Neither is automatically wrong, but you should know which one you are buying. Look for each of these, either priced or marked as included:

• Line set: the copper lines between the indoor and outdoor units. New or reused? If reused, ask whether it is the right size for the new equipment and how it will be cleaned and pressure-tested.
• Pad or wall bracket for the outdoor unit.
• Electrical: disconnect, whip and breaker. A panel upgrade is usually a separate line, often done by an electrician.
• Thermostat: the model, and whether it works with the new equipment’s stages or variable speed.
• Condensate drain, and a condensate pump if the drain can’t run by gravity.
• Duct transitions, filter rack, and any duct sealing or repair.
• Removal and disposal of the old equipment, including refrigerant recovery by an EPA-certified technician.
• Start-up: refrigerant charge and airflow checked, with the readings written down.

Permit and load calculation

Replacing a furnace, air conditioner or heat pump almost always needs a mechanical permit. The quote should say who pulls it and whether the fee is included. A quote that leaves the permit out, or offers a lower price without one, is a warning sign.

Size should come from a load calculation. The International Residential Code, the model code most states build on, requires equipment sized with ACCA Manual S from loads calculated with ACCA Manual J or another approved method. Ask for the result. If the only basis is square footage or “same size as the old one,” the size is a guess.

Warranty and payment terms

• Parts warranty: set by the manufacturer. Many offer a longer term only if the equipment is registered after installation. Ask who registers it and ask for the confirmation.
• Labor warranty: set by the contractor, and it varies widely. Get the length in writing and what it covers, such as refrigerant and return visits.
• Compressor and heat exchanger terms can differ from the general parts term. Read them separately.
• Payment schedule: the deposit, what triggers each payment, and when the balance is due. Final payment should follow start-up and, where required, the inspection.
• Cancellation: for a sale made in your home, the FTC Cooling-Off Rule generally gives you until midnight of the third business day to cancel. It does not cover a repair visit you asked for, but it does cover purchases beyond that repair.

Some states cap deposits. In California, the down payment on a home improvement contract can’t exceed $1,000 or 10% of the contract price, whichever is less. Where there is no cap, a large payment long before the equipment arrives is a risk you carry.

Red flags

• No model numbers, only a brand and a size.
• No permit, or an offer to skip it.
• A large deposit well before delivery.
• An R-410A system sold as an ordinary new install in 2026. It is legal only if every main component was made or imported before January 1, 2025. Ask for the manufacture dates and how the warranty applies.
• Size set by square feet alone, with no load calculation.
• Efficiency claims with no AHRI number behind them.
• A promised federal tax credit. The 25C credit ended for equipment placed in service after December 31, 2025.
• Pressure to sign today for a special price.

Compare quotes on the same scope

Put quotes side by side only after matching the equipment tier, size, efficiency and scope. Most gaps between honest quotes come from the line set, ductwork, electrical work, the thermostat and the labor warranty. Once the scope matches, a large price difference deserves a direct question.

Questions

Should an HVAC quote include model numbers? Yes. Full model numbers for the outdoor unit, indoor coil and furnace or air handler let you verify the AHRI rating and compare quotes like for like. A brand and a size alone are not enough.

What is an AHRI certificate? It is a record from the AHRI Directory showing that a specific combination of outdoor and indoor units was certified, with its capacity and efficiency ratings. Rebate programs often require its Certified Reference Number.

How big a deposit is normal for an HVAC replacement? It depends on the state and the contractor. California caps home improvement down payments at $1,000 or 10% of the contract price, whichever is less. Elsewhere, pay as little as you can before the equipment arrives.

Can I cancel an HVAC contract after signing? If you bought something at home during a salesperson’s visit, the FTC Cooling-Off Rule generally lets you cancel until midnight of the third business day. It doesn’t cover a repair visit you requested, but it does cover purchases beyond that repair. State law may add more protection.

Sources

• AHRI Directory of Certified Product Performance — https://www.ahridirectory.org/
• AHRI: How and why of certified products — https://www.ahrinet.org/certification/cee-directory/how-and-why-certified
• DOE: 2023 central air conditioner standards guidance — https://www1.eere.energy.gov/buildings/appliance_standards/pdfs/2023_CAC_Standards_FAQ_10-5-2022_Final.pdf
• EPA: Technology Transitions HFC restrictions by sector — https://www.epa.gov/hfcs/technology-transitions-hfc-restrictions-sector
• EPA: May 2026 Technology Transitions final rule fact sheet — https://www.epa.gov/system/files/documents/2026-05/fact-sheet-san-12166-technology-transitions-frm.pdf
• ICC: Residential HVAC design process (Manual J, S, D in the IRC) — https://iccsafe.org/wp-content/uploads/Residential-HVAC-Design-Process.pdf
• FTC: The Cooling-Off Rule — https://consumer.ftc.gov/articles/buyers-remorse-ftcs-cooling-rule-may-help
• CSLB: Home improvement contracts — https://www.cslb.ca.gov/Consumers/Hire_A_Contractor/Home_Improvement_Contracts/What_Is_A_Contract.aspx
• IRS: Energy Efficient Home Improvement Credit — https://www.irs.gov/credits-deductions/energy-efficient-home-improvement-credit
• City of Bradenton, FL: Mechanical permit requirements — https://cityofbradenton.com/vertical/sites/%7B98CFEB92-7265-45CB-AF6F-7115C2CD7C81%7D/uploads/Mechanical.pdf