HVAC Estimate Template: Tonnage, SEER2, and Line Items

Short answer: An HVAC estimate template names the capacity in tons, where one ton is 12,000 BTU per hour, the efficiency as SEER2, and the AHRI reference number for the matched outdoor unit, coil, and air handler. Capacity comes from a Manual J load calculation, never from square footage. Price lineset by the foot, ductwork by run or register count, then list thermostat, electrical, permit, refrigerant recovery, old equipment disposal, and commissioning as separate lines. Duct and panel conditions stay conditional.

Two customers with identical 2,100 square foot houses can need a 2.5-ton and a 4-ton system, and the contractor who priced both at three tons because of the square footage will fail one of them. An oversized system short-cycles and never pulls humidity; an undersized one runs flat out on the design day and still loses. The estimate is where that decision becomes visible, and it should show the arithmetic rather than a model number and a price.

What has to appear on an HVAC estimate template?

Everything the homeowner will be compared against when they collect two other bids — which is the actual competitive situation, and the reason a bid with only three lines loses to a bid with fifteen.

Line	Unit	Why it is its own line
Load calculation	Included, or a fee	The basis of every number below it
Outdoor unit	Each, by model	Tonnage, SEER2, and refrigerant type belong in the description
Indoor coil or air handler	Each, by model	The match is what determines rated efficiency
Furnace, if in scope	Each, by model	Input BTU and AFUE named
Lineset	Linear feet, by size	New copper, reused line, or line flush are three prices
Refrigerant beyond factory charge	Ounces or feet	The factory charge covers a stated length only
Plenums and transitions	Each	Sheet metal fabricated on site is labor, not a freebie
Ductwork	Linear feet, or per register	Trunk, branch, returns, and sealing
Condensate	Each	Primary, secondary, pan, float switch
Electrical	Each	Disconnect, whip, breaker sized to nameplate
Thermostat	Each	Wire count decides whether this is easy or a pull
Permit and inspection	At cost	Mechanical permits apply in most jurisdictions
Removal and disposal	Each	Includes recovering the old refrigerant charge
Commissioning	Included, with readings	Charge, airflow, and static pressure, written down

How do I size the system without guessing from square footage?

Run a Manual J load calculation and put its result on the estimate. It accounts for orientation, window area and glazing, insulation levels, infiltration, ceiling height, duct location, and local design temperatures — all of the things square footage cannot see.

Sizing error	What the customer experiences
Oversized	Short cycling, cold and clammy air, humidity never comes down, compressor wear
Undersized	Runs continuously on design days and still drifts off setpoint
Correct, bad ducts	Right equipment, wrong airflow, and the complaint sounds identical to both of the above

Tonnage is the unit and it is coarse: 1.5, 2, 2.5, 3, 3.5, 4, and 5 tons, so 18,000 to 60,000 BTU per hour. The steps are half a ton up to four, then jump straight to five, because 4.5-ton residential equipment is rarely built or stocked. A load that lands at 32,000 BTU/h means a 2.5-ton or 3-ton decision, and Manual S is what turns the load into the specific model at the specific indoor conditions.

Write it on the estimate as a sentence: “Manual J load calculation performed 7/24/2026. Design cooling load 31,800 BTU/h, heating load 46,200 BTU/h. Equipment selected per Manual S.” That sentence is also your defense if a competitor’s four-ton bid comes in cheaper.

What does the equipment line have to name?

Five things, all of which the homeowner can verify and a rebate program will demand.

• Tonnage or BTU capacity, stated at the rating condition.
• SEER2 and HSPF2, not the old SEER and HSPF, since efficiency has been rated on the current test procedure for new equipment. Minimums are regional: split-system air conditioners under 45,000 BTU/h carry a lower national minimum in the North and a higher one in the South and Southwest.
• The refrigerant. New residential equipment moved to A2L refrigerants such as R-454B and R-32, which changes tools, storage, leak detection, and whether an existing lineset can be reused.
• Model numbers for every component, outdoor unit, coil, and air handler or furnace.
• The AHRI reference number for that combination. Rated efficiency belongs to the matched system, not to the condenser alone, and an unmatched pairing can cost the customer their rebate and complicate the manufacturer warranty.

Handling refrigerant at all requires certification. Adding or removing charge, or connecting and disconnecting lines, falls under EPA Section 608 technician certification, and putting the certification on the estimate quietly separates you from the bid that did not mention it.

What does a filled HVAC replacement estimate look like?

A full changeout: 2.5-ton condenser, matched coil, 60,000 BTU high-efficiency furnace, existing ducts retained. Note that the furnace is sized off the 46,200 BTU/h heating load rather than off the old furnace’s nameplate — the habit of replacing an 80,000 BTU unit with another 80,000 BTU unit is how most residential furnaces end up half again larger than the house needs. Rates below are one contractor’s cost model shown so the structure is visible. Replace them with numbers built from your own equipment cost, your loaded labor cost, your overhead per hour, and your target margin.

#	Description	Qty	Amount
1	Manual J load calculation and Manual S selection, report provided	1	Included
2	Condenser — 2.5 ton, 15.2 SEER2, R-454B, model on attached spec sheet	1	$2,980.00
3	Matched cased evaporator coil, AHRI reference on attached certificate	1	$860.00
4	Upflow furnace — 60,000 BTU input, 96% AFUE (57,600 output vs 46,200 load), variable-speed blower	1	$1,940.00
5	Lineset — new 3/8 in liquid, 3/4 in suction, insulated, 28 lin ft	28 lf	$392.00
6	Refrigerant beyond factory charge — 13 ft past the rated length, per install manual	1	$85.00
7	Supply plenum and return transition, fabricated and sealed on site	1	$795.00
8	Condensate — primary and secondary drains, new pan, float switch	1	$215.00
9	Electrical — new disconnect, whip, breaker sized to nameplate MOCP	1	$340.00
10	Thermostat — conventional, plus one additional wire pulled	1	$195.00
11	Composite pad, vibration isolation, line hide on exterior wall	1	$165.00
12	Removal and disposal of existing equipment, refrigerant recovered under EPA 608	1	$220.00
13	Mechanical permit and inspection, at cost, receipt attached	1	$185.00
14	Installation labor — two technicians, approximately 12 hours on site	1	$2,160.00
15	Commissioning — charge verified by subcooling, static pressure and airflow measured and recorded on the invoice	1	Included
	Estimate total		$10,532.00

Commissioning belongs on the page even at zero dollars. It tells the homeowner that airflow, static pressure, and charge get measured rather than assumed, and it is a difference they can ask the other two bidders about.

Which lines cannot be priced before something is opened up?

Four, and each becomes an allowance with a stated rate rather than a number invented in the driveway.

Condition	Why it is unknowable at the estimate	How to write it
Duct condition and sizing	Static pressure cannot be measured until the new blower runs	Hourly plus material, triggered if measured static exceeds the equipment’s rated maximum
Electrical panel capacity	No open double-pole space, or an undersized service	At cost plus a stated percentage, by a licensed electrician — see the electrical estimate template for how that sub’s document should read
Lineset reuse	Interior condition and prior refrigerant contamination unknown	Price new copper as the base, credit the customer if a flush and pressure test qualifies the existing line
Insulation or wrap on old duct in older homes	May require testing before disturbance	Stop-work condition, abatement by others

Do not fold these into a padded fixed price. A padded price loses the bid to a contractor who did not pad, and then you meet the same problem with no allowance to bill against.

How is a service call estimate different from a replacement estimate?

Different document, different unit, different money entirely. A replacement is priced by equipment and installed components. Service is priced by the trip and the task.

Element	Replacement	Service call
Unit	Tonnage, SEER2, matched system	Trip or diagnostic fee, then flat rate per task or hourly
Approval	Signed before ordering	Diagnostic first, repair approved after
Parts	Named by model	Named by part number, capacity, and voltage
Refrigerant	Included in the install charge	Billed by type and pounds added, with the leak found or noted
Validity	Weeks, tied to equipment pricing	The same day, usually the same hour
Warranty	Manufacturer plus your labor term	Parts and labor term on that repair only

Never quote a repair before diagnosis. Quote the diagnostic, get approval for it, then quote the repair with the part named. Customers accept that sequence readily when it is stated at the door, and it protects you from a phone estimate that turns out to be a compressor.

How long is the estimate valid and how is it accepted?

Fourteen to thirty days. Equipment pricing changes on manufacturer schedules, and refrigerant transitions have made older stock a moving target. State the expiry as a date and what happens after: “Held through August 15, 2026. After that, equipment re-quoted at current distributor pricing; labor rates unchanged.”

The acceptance block collects a signature, a printed name, a date, the deposit, and separate initials on the allowance rates. Name the deposit as a dollar figure tied to the equipment order rather than a percentage, and name the balance as a date rather than a duration — both habits come straight out of how to get clients to pay. Add three sentences underneath most contractors leave out: who registers the manufacturer warranty and by when, what your own labor warranty covers and for how long, and what the customer must do to keep both — filter changes and a maintenance visit are commonly conditions of the parts warranty, not suggestions.

What do I keep after the system is running?

The load calculation, the AHRI certificate, the model and serial numbers of everything installed, the permit and the signed inspection, the commissioning readings, the warranty registration confirmation, and every distributor invoice. That package is what makes a warranty claim in year seven a phone call instead of an argument.

Keel holds it on your phone and nowhere else — an iOS app running entirely on the device, with no account, no bank connection, no cloud, no login, and an App Store privacy label reading Data Not Collected. When the job is approved you raise the invoice from the driveway with your own numbering, your logo, your brand color, and a payment link the customer scans as a QR code, with the serial numbers typed into the description where they will still be findable years later. Distributor tickets, permit fees, and the brazing rods are photographed and read on device by Apple Intelligence. Freeboard shows cash minus your tax reserve minus committed invoices, which matters in a trade where a single equipment order can be five figures and the deposit is not yours yet — the same discipline behind setting aside for 1099 taxes. Free covers unlimited invoices, receipts, and mileage; Keel Pro is a one-time $249.99 Lifetime purchase, not a subscription. You can get it on the App Store.

Frequently asked questions

How do I size an HVAC system for a house?

With a Manual J load calculation, not a square-foot rule. It uses orientation, window area and glazing type, insulation, air leakage, ceiling height, duct location, and local design temperatures to produce a heating and cooling load in BTU per hour. Convert to tons at 12,000 BTU per hour, then use Manual S to select an actual model. Put the load numbers on the estimate.

What is a ton of cooling and how many tons do I need?

One ton equals 12,000 BTU per hour of cooling capacity, a unit inherited from the ice trade. Residential equipment comes in half-ton steps from 1.5 to 5 tons. The number you need comes from the calculated load, not the floor area, because two identical-sized houses with different glass, orientation, and insulation can legitimately need capacities a full ton apart.

Should an HVAC estimate list the AHRI reference number?

Yes. Rated efficiency belongs to the matched combination of outdoor unit, indoor coil, and air handler or furnace, not to the condenser by itself. The AHRI reference number identifies that certified combination. Rebate programs ask for it, and an unmatched system may not deliver its advertised SEER2 or qualify for the manufacturer’s warranty terms the homeowner thinks they are buying.

Can I reuse the existing lineset on a system replacement?

Sometimes, and it should never be assumed on the estimate. Line size has to suit the new equipment, the interior has to be clean of oil from a failed compressor, and the change to A2L refrigerants adds its own considerations. Price new copper as the base case and offer a credit if a flush and pressure test qualify the existing line, rather than the reverse.

What should an HVAC estimate say about ductwork?

Whether it is included, inspected, or excluded, in those words. If the ducts stay, add a condition: static pressure gets measured at commissioning, and if it exceeds the equipment’s rated maximum, corrective work is billed at a stated hourly rate plus material. New equipment on undersized ducts underperforms in a way the customer will blame on the equipment you sold them.

How long should an HVAC estimate be valid?

Two to four weeks is typical, because distributor equipment pricing moves on manufacturer schedules and refrigerant transitions affect availability. Print the expiration as a date and say what changes afterward, normally that equipment is re-quoted at current pricing while labor holds. Also state the deposit, because equipment often has to be ordered before the crew is scheduled.

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This article is general information, not professional or tax advice.