An HVAC estimate does two jobs. It tells the homeowner exactly what they're buying, and it protects you when the job changes halfway through. A one-line quote ("New AC, $X installed") wins nothing and protects nothing. A clear estimate shows you did the work to size the system, lays out the options and leaves no room for "I thought that was included."
Below is a template you can copy into your own document or estimating software, section by section, followed by a worked example. All prices in the example are made up to show the format, not market rates. Licensing, permit and code rules vary by state and city; check yours.
The template
| Section | What to include |
|---|---|
| 1. Your business | Company name, address, phone and email; your contractor license number and the state that issued it, where your state licenses HVAC work; estimate number; date; valid-until date. |
| 2. Customer and site | Customer name, service address, best phone, email; home type, square footage, year built; existing system (type, make, model, age, fuel); access notes (attic, crawlspace, roof, pets). |
| 3. What we found | The problem or request in plain words; diagnostic findings; photos referenced by number; any safety issue you noted. |
| 4. Sizing and design | How you sized the system (for example a room-by-room load calculation, such as ACCA Manual J, rather than matching the old unit); results summary; ductwork condition and any changes. |
| 5. Scope of work | Numbered steps: remove and dispose of old equipment; install new equipment; line set, electrical, condensate, thermostat; startup, testing and commissioning; cleanup. |
| 6. Equipment | For each item: brand, model number, capacity, efficiency rating, quantity, and whether a matched system is required for the rating or rebate. |
| 7. Materials | Line set, pad or stand, disconnect, whip, drain line, filter base, thermostat, refrigerant, duct materials; either itemized or as one line. |
| 8. Labor | Crew size and estimated hours or a flat labor line; after-hours or weekend rates if they apply. |
| 9. Permits and inspections | Which permits you will pull, who pays the fees, and that the job includes an inspection where required. |
| 10. Options | Good, better and best, each with its own equipment list and total, so the customer compares like with like. |
| 11. Exclusions and assumptions | What is not included (electrical panel upgrades, drywall repair, asbestos or mold, duct replacement beyond the listed sections) and what you assumed (attic access, existing circuit is adequate). |
| 12. Price summary | Subtotal per option, tax where applicable, any rebates or credits listed separately with who is responsible for claiming them, and the total. |
| 13. Payment terms | Deposit, when the balance is due, accepted methods, and financing if you offer it. |
| 14. Warranty | Manufacturer parts warranty (and any registration the customer or you must complete), your labor warranty, and what voids either. |
| 15. Schedule | Estimated install date or lead time for equipment, and how long the job takes. |
| 16. Change orders | How changes found during the job are priced and approved: in writing, before the extra work starts. |
| 17. Acceptance | Option chosen, customer signature, date, and your signature. |
Why each section earns its place
- License number and valid-until date: Customers check licenses, and equipment prices change. A valid-until date lets you re-quote without an argument.
- Sizing method: Showing how you sized the system separates you from the bid that just swapped in the same tonnage. It also justifies a size change the customer didn't expect.
- Model numbers: Two quotes for a "3-ton 16 SEER2 system" can be very different equipment. Model numbers let the customer (and you) compare honestly and check rebate eligibility.
- Exclusions: Most HVAC disputes are about something nobody wrote down: the panel that needed upgrading, the drywall cut to run a line. Write it down.
- Change orders: Old homes hide surprises. Agreeing up front on how surprises are priced keeps the job moving.
Compliance notes worth putting on paper
- Refrigerant handling: The EPA says technicians who maintain, service, repair or dispose of equipment that could release ozone-depleting refrigerants must be certified under Clean Air Act Section 608. Saying that certified technicians will recover the old refrigerant reassures customers and documents your process. (Checked October 18, 2026.)
- Permits: Most equipment replacements need a mechanical permit, and often electrical too, but rules are set locally. The SBA notes that local governments set their own licensing and permitting requirements, and lists plumbing and construction among commonly regulated activities. Check with your city or county building department. (Checked October 18, 2026.)
- Rebates and tax credits: Utility rebates and tax credits change often and have their own rules. List them separately from your price, name the program and say who files the paperwork, rather than folding an expected rebate into your total.
This is general information, not legal advice. Contract and licensing requirements differ by state.
A worked example: replacing a central AC and furnace
Here's what the template looks like filled in for a fictional job. Every name, model and price is illustrative.
- 1. Business: Example Heating & Air · License #[your number] · Estimate #1042 · Date: Oct 18 · Valid until: Nov 17.
- 2. Customer and site: J. Rivera, 12 Elm St. Two-story, about 2,000 sq ft, built 1994. Existing: 22-year-old gas furnace and 3-ton AC; furnace in basement, condenser on the side yard. Dog in the yard on weekdays.
- 3. What we found: AC not cooling. Compressor failed (photos 1 to 3). Furnace heat exchanger shows rust; no cracks seen. Customer wants options for replacing both.
- 4. Sizing: Room-by-room load calculation done on site. Result supports a 2.5-ton system; the existing 3-ton unit is oversized. Supply and return ducts in fair condition; one undersized return to be enlarged.
- 5. Scope: (1) Recover refrigerant and remove old AC and furnace. (2) Install new furnace, coil and condenser. (3) New line set, pad, disconnect and whip. (4) Enlarge upstairs return. (5) New thermostat. (6) Startup, charge check, airflow test. (7) Haul away and clean up.
| Option (example prices) | Equipment | Price |
|---|---|---|
| Good | Single-stage 2.5-ton AC + single-stage furnace, basic thermostat | $9,800 |
| Better | Two-stage 2.5-ton AC + two-stage furnace, programmable thermostat | $12,400 |
| Best | Variable-speed 2.5-ton heat pump + two-stage furnace backup, communicating thermostat | $16,900 |
- 9. Permits: Mechanical and electrical permits included in price; inspection scheduled after install.
- 11. Exclusions: Electrical panel upgrade if required by inspector; drywall or paint repair beyond the return opening; duct cleaning.
- 12. Rebates: Listed separately with the program name; customer files, we supply model numbers and the install certificate.
- 13. Payment: 30% deposit to order equipment; balance due at completion.
- 14. Warranty: Manufacturer parts warranty per registration; 2-year labor warranty from Example Heating & Air.
- 16. Change orders: Any extra work found during install is described and priced in writing and approved by the customer before it starts.
Pricing the job: the method
Price each option the same way: equipment and materials at your cost, plus labor hours times your loaded labor rate (pay plus payroll costs), plus a share of overhead, then divide by one minus your target margin. Our guide to pricing cleaning services walks through that formula and the margin-versus-markup trap in detail; the math is the same for an equipment job.
Presenting the estimate
- Walk through it in person or on a call when you can. A PDF in an inbox competes with three others.
- Lead with the problem and your sizing, then the options. Price comes last.
- Say plainly what the cheapest option gives up.
- Send a short text the same day so the customer has your number in their thread: "Hi J., this is Sam from Example Heating & Air. Your estimate is in your email. Text me here with any questions, and I can walk through the options by phone."
- Follow up after two or three days, then again after a week. Many estimates are lost to silence, not to a competitor.
How Chargezen helps
The estimate itself belongs in your HVAC software or your document template. Chargezen handles the calls and texts around it. To be clear about what it isn't: Chargezen doesn't book appointments, dispatch crews, write estimates or send invoices. Keep your scheduling and invoicing tool for that. Chargezen is the phone, text and AI layer that makes sure the customer reaches you in the first place.
- The no-cool call gets answered: In July, the first company that answers often gets the job. Concierge answers on your business number as an AI receptionist, takes down the address, the problem and how urgent it is, and when the caller needs a person, teammates you choose are alerted, including a push notification in the Finn app.
- Photos of the unit by text: Homeowners can text photos of the nameplate or the thermostat to your business number. They show up in the customer's conversation in the team inbox.
- Follow-ups from one number: Your comfort advisor and office both text from the business number, so the estimate conversation doesn't live on one person's cell. See how to share one business number with your team.
- A teammate can join a live call: Listen in from the Finn app or the browser and tap Join the call. See phone.
Concierge Starter is $20 a month with 20,000 credits. Pro is $199 a month with 199,000 credits, or $1,990 a year. Phone and text charges are billed as used. SmartyTap, with the team inbox, starts at $20 a month. See pricing.
Related terms: AI receptionist, MMS and warm transfer. Related guides: business phone etiquette with scripts, what missed calls cost and after-hours text message examples. For your phone line, see Concierge for HVAC companies.
Frequently asked questions
What should an HVAC estimate include?
Your business and license details, the customer and site, what you found, how you sized the system, the scope, equipment model numbers, labor, permits, options, exclusions, the price summary, payment terms, warranty, how changes are handled and a signature line.
Is an estimate the same as a contract?
Not always. A signed estimate with clear terms can work as the agreement, but some states require specific contract language for home improvement work. Check your state's rules or ask an attorney. This is not legal advice.
How long should an HVAC estimate be valid?
Long enough for the customer to decide and short enough that your equipment prices still hold. Set a date you're comfortable with and print it on every estimate.
Should I give good, better and best options?
Most customers like a choice. Keep it to three, list exact equipment for each, and say plainly what the lower options give up.
