HVAC Pricing Guide: Tons, SEER2, and What Breaks the Unit

Short answer: This HVAC pricing guide starts with the ton — 12,000 BTU/h of cooling capacity — but the ton only sizes the equipment, and a Manual J load calculation picks it, not floor area. SEER2 changes the cabinet, the coil, and sometimes the plenum above it. Everything else on the job is measured in linear feet of lineset and duct, in circuits, and in permits. The same 3-ton system can land over 60 percent apart between two houses.

Tonnage is the number everyone in this trade quotes and the number that explains the least. It describes the box you bought, and the box is rarely the part that decides whether the job made money. This page takes the unit apart: what a ton measures, what SEER2 drags along with it, which line items ignore tonnage entirely, and what the identical 3-ton changeout costs in two different houses. The paperwork that has to hold up after the system runs is covered in what to include on an invoice.

What does a ton actually measure?

Twelve thousand BTU per hour of heat removal, a figure inherited from the cooling effect of melting a ton of ice in a day. Residential equipment comes in half-ton steps — 1.5, 2, 2.5, 3, 3.5, 4, and 5 tons, or 18,000 to 60,000 BTU/h.

The important part is that nominal tonnage is a bin, not a promise. A unit sold as 3 tons is commonly rated somewhere in the mid-thirty-thousands of BTU/h at standard rating conditions, and its real output changes with outdoor temperature, indoor coil match, airflow, and charge. Two 3-ton systems from different manufacturers are not the same machine, and the AHRI certificate for the specific outdoor and indoor combination is what tells you what you actually sold.

Why doesn’t square footage pick the tonnage?

Because floor area does not determine load. Orientation, glazing area and type, insulation, infiltration, ceiling height, duct location, occupancy, and local design temperatures all move it, and a Manual J calculation is what turns those into a number. Two houses of identical size can land a full ton apart.

Guessing high is not the conservative error. Oversized equipment satisfies the thermostat before it pulls humidity out of the air, short-cycles, wears its compressor, and produces a clammy house and a complaint you will drive back to for free. Undersized equipment runs continuously on the design day and still loses ground. Either mistake means you bought the wrong box, priced from it, and now own the outcome. Manual S is the step that converts the calculated load into a specific model at specific conditions.

What does SEER2 change besides the sticker?

More than efficiency. SEER2 is measured under a test procedure that loads the blower against higher external static pressure than the old SEER test did, which is closer to how equipment actually lives in a real duct system. Higher-rated equipment usually means larger coil face area, taller indoor cabinets, and bigger outdoor units, and every one of those becomes an installation cost.

What rises with SEER2	What it does to the install
Indoor coil cabinet height	Existing plenum may not fit; a transition gets fabricated on site
Outdoor unit footprint and weight	Pad size, clearances to the wall and fence, sometimes a new location
Sensitivity to duct static	Undersized returns that “worked” become a callback on the new system
Match specificity	Only the certified indoor and outdoor combination earns the rating
Price of the box itself	The largest single line on the ticket moves first

Efficiency minimums are also regional. Split-system air conditioners installed on or after January 1, 2023 must meet 13.4 SEER2 in the North and 14.3 SEER2 in the Southeast and Southwest, and in the regional-standard states compliance is measured at installation rather than at manufacture, as the Department of Energy explains in its regional standards enforcement material. The contractor who installs a non-compliant unit is the one exposed, which makes this a pricing question as well as a compliance one: cheap equipment that cannot legally go on the pad is not cheap.

What is inside a “per ton installed” number, and what is not?

Per-ton pricing is shorthand for the equipment plus a typical install in a typical house. It falls apart the moment the house is not typical.

Usually inside a per-ton figure	Usually outside it
Matched condenser and indoor coil or air handler	Lineset beyond a nominal length
Standard refrigerant charge and evacuation	Any duct modification, return upsizing, or plenum fabrication
Reconnection to an existing, adequate circuit	New circuit, panel work, or a subpanel
A basic programmable thermostat	Communicating or zoned controls, and the wiring they need
Removal of the old equipment	Crane, attic hoisting, or crawlspace access allowances
Startup and charge verification	Airflow correction after static readings come back high
Standard pad and isolation	Permit and third-party inspection fees

Which items don’t scale with tonnage at all?

Most of the ones that ruin a bid. These are measured in linear feet, in counts, or in access difficulty, and a 2-ton job in a hard house can carry more of them than a 5-ton job in an easy one.

Item	Unit	What drives it
Refrigerant lineset	Linear foot	Distance from the condenser to the coil, plus the route, plus vertical lift
Line hide and chase work	Linear foot	Exposed exterior runs the homeowner will look at every day
Duct trunk and branch	Linear foot, or per supply register	Layout, existing sizes, whether returns are adequate
Plenum and transition metal	Per fabricated piece	The gap between the old opening and the new cabinet
Electrical	Per circuit, plus the disconnect and whip	Panel capacity and distance to the unit
Condensate	Per pump, pan, float switch, and foot of PVC	Whether gravity drain is available
Permit and inspection	Per job	Jurisdiction, and whether a third party inspects
Old equipment removal	Per unit	Recovery, hauling, and the recycler’s fee
Commissioning	Per hour	Static pressure, charge, and airflow after everything is connected

What does the same 3-ton system cost in two houses?

Identical equipment on both jobs: a 3-ton condenser with a matched coil on an existing gas furnace, same brand, same efficiency, same thermostat.

Variable	House A	House B
Stories and equipment location	One story, furnace in a main-floor closet	Two stories, furnace and coil in the attic
Condenser distance	12 ft, straight run	46 ft, routed through an interior chase
Existing plenum	New coil cabinet fits	Too short — transition fabricated on site
Electrical	Existing disconnect and whip serviceable	Panel full; licensed electrician adds a circuit
Returns	Adequate, static within range	Undersized, one return upsized before startup
Condensate	Gravity drain available	Pump, secondary pan, and float switch required
Access	Ground level, driveway to the pad	22-inch attic scuttle and a 40 ft crawl
Permit	Permit only	Permit plus third-party inspection

Now what those differences cost.

Line	House A	House B
Equipment at distributor cost	$3,690	$3,690
Installed material	$464	$1,743
Subcontracted electrical	none	$680
Technician hours	13.5	29.5
Labor at $92 loaded per hour	$1,242	$2,714
Cost	$5,396	$8,827
Price at 28% margin	$7,494	$12,260
Permit and inspection at cost	$95	$310
Quoted	$7,589	$12,570
Effective price per ton, before the pass-through permit	$2,498	$4,087

The equipment line is identical on both jobs. Everything that separates them — 24 extra feet of lineset, fabricated metal, a circuit, a return, a condensate pump, sixteen more technician hours, and an inspection — is invisible to a per-ton rate. That is the whole argument against quoting one.

On the margin question, note that a 28 percent markup on that $3,690 equipment package returns $4,723 and collects only a 21.9 percent margin, while a 28 percent margin returns $5,125. The gap is $402 on one changeout, because markup multiplies cost and margin divides by one minus the rate. On the largest material line in residential contracting, that difference compounds fast.

Where does the ton stop being the unit entirely?

On a good share of the work in an HVAC book, tonnage is not the measure at all.

When the job is	The unit that actually prices it
A ductless retrofit	Indoor head count, with the outdoor unit sized on combined and simultaneous load
Duct replacement or extension	Trunk and branch linear feet, or delivered CFM per register
A repair call	A dispatch fee, then a flat rate per named task
Filtration, UV, or humidification add-ons	Per device, gated by cabinet space and available power
Airflow diagnosis	Hourly against a written cap, because nothing is known before the manometer goes on

Mixing these up is expensive in a specific direction: service work priced like a small install loses the drive time, and duct work priced by tonnage loses the attic.

Why should the per-ton number never leave your office?

Because a homeowner who hears one will compare it against a bid that measured a different house. Internally it is a useful check — reverse a finished quote into dollars per ton and set it beside your last five changeouts of similar difficulty. A number well under your own history means you missed the lineset run, the panel, or the plenum.

Published price ranges for a system replacement differ by more than a factor of two between metros and shift with equipment availability, refrigerant transitions, permit regimes, and how deep into cooling season you are. Use them to catch an order-of-magnitude error and nothing else. Your distributor pricing, your labor market, your drive times, and your overhead decide the answer. Getting that number collected on schedule is a separate discipline, and how to get clients to pay covers it.

What has to be recorded on every install?

Five things: the Manual J result, the model and serial numbers of both halves of the system, actual technician hours, actual distributor cost including the parts swapped from van stock, and the commissioning readings — static pressure, subcooling or superheat, and delivered temperature split. The first four rebuild next year’s rates. The last one settles a comfort complaint in August without a free trip.

Keel keeps that record in the only place you will actually use it: the phone in your pocket in an attic. It is an iOS app running entirely on the device — no account, no bank connection, no cloud, no login, and an App Store privacy label that reads Data Not Collected. Distributor tickets, the electrician’s invoice, and the permit receipt get photographed at the counter and read on device by Apple Intelligence, so the $3,690 of equipment on a changeout is filed against the job instead of curling in a door pocket. The invoice goes out from the driveway the day the system runs, carrying your own numbering, your logo, the serial numbers typed into the description where they will still be findable in year eight, and a payment link the homeowner scans as a QR code. Distributor and permit-counter runs are logged trips, handled the way how to track mileage for taxes describes. Freeboard shows cash minus tax reserve, minus committed invoices, minus a buffer, which matters when one equipment order is five figures and the deposit is not yours yet — the same thinking behind how much to set aside for 1099 taxes. Keel is free with unlimited invoices, receipts, and mileage; Keel Pro is a one-time $249.99 Lifetime purchase, not a subscription.

Frequently asked questions

How many BTU is a ton of air conditioning? Twelve thousand BTU per hour. Residential equipment is sold in half-ton steps from 1.5 to 5 tons, or 18,000 to 60,000 BTU/h. Nominal tonnage is a category rather than an exact output: a unit labeled 3 tons is rated near but not exactly 36,000 BTU/h, and its real capacity varies with outdoor temperature, coil match, airflow, and charge.

How do I size an HVAC system correctly? With a Manual J load calculation, which accounts for orientation, glazing, insulation, infiltration, ceiling height, duct location, occupancy, and local design temperatures. Then use Manual S to select a specific model that meets that load at those conditions. Rules of thumb based on square feet per ton routinely miss by a half ton or more in either direction, and both directions cost you.

What does SEER2 mean for pricing a job? SEER2 is rated under a test that loads the blower against higher external static pressure, closer to real duct conditions. Higher-rated equipment tends to be physically larger, so plenum transitions, clearances, and pad work can all change. Only the certified indoor and outdoor combination earns the rating, and regional minimums apply at installation in the Southeast and Southwest.

Should I quote HVAC by the ton? Use it internally as a check, not as a quote. Tonnage prices the equipment and ignores lineset length, duct condition, returns, electrical capacity, condensate routing, attic or crawl access, permits, and inspections — which is where two identical systems separate by thousands. Build the number from hours, material, and equipment, then divide by tons afterward to sanity-check it.

Why do two HVAC quotes on the same house differ so much? Usually scope rather than equipment. One quote may include a new circuit, fabricated plenum transition, upsized return, condensate pump, permit, and inspection while another assumes everything existing is reusable. Efficiency tier and warranty terms move it further. Compare the line items and the specific model numbers, since the AHRI-matched combination is what determines both performance and price.

How long does a system changeout take? A straightforward one-story cooling changeout with good access commonly runs a single day for two technicians. Attic equipment, long linesets, panel work, duct modification, or an inspection wait can double the technician hours without changing the equipment at all. Price the hours you expect for that specific house, then record what it actually took so the next estimate is built on evidence.

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