Free HVAC estimate template for changeouts and installs

By Zeke Galland, Staxen. Updated 2026-09-08.

This free HVAC estimate template covers the four buckets every mechanical bid needs: equipment, ductwork, refrigerant and venting, and labor with commissioning. Equipment is by the each with model numbers, duct and line set by the foot, refrigerant by the pound. A downloadable PDF version is available on this page.

Equipment

Ductwork

Refrigerant, venting, and drains

Labor and commissioning

Example scope

Replace a 20 year old system in a 2,000 sf two-story: new 96 percent gas furnace, AHRI-matched 3 ton condenser and coil, new 35 lf line set, PVC venting, smart thermostat, media filter cabinet, and a new pad. Includes mechanical permit, startup, and charge verification. Existing ductwork reused after inspection, with any repairs priced separately.

What a hvac estimate must include

Equipment with model numbers and the AHRI match

Write the actual furnace, coil, and condenser model numbers and the AHRI certificate number for the matched system. Rebates, the manufacturer warranty, and the permit all key off that match. A bid that says 3 ton system, no models, is a bid the client cannot verify and a rebate they cannot claim.

The load calculation behind the tonnage

Note that sizing comes from a Manual J load calculation, not from matching whatever was there before. Oversized equipment short-cycles and leaves humidity in the house. One line on the estimate saying sized per Manual J is a differentiator against every rule-of-thumb bid you compete with.

What is replaced versus reused

Changeouts live or die on this. Say explicitly whether the line set, the plenum, the flue, the pad, and the thermostat are new or reused. A 96 percent furnace vents in PVC and drains condensate, so replacing an 80 percent unit means new venting and a drain, and that belongs on the estimate, not in a surprise.

Refrigerant and line set by real units

Line set prices by the linear foot, around $6.60 in material, and refrigerant by the pound, R-410A around $9.50. New equipment now ships on A2L refrigerants, so a system that keeps old lines may need them flushed or replaced. Showing these units tells the client you measured their house, not a brochure.

Exclusions for the adjacent trades

Exclude electrical service upgrades, new circuits and disconnect wiring beyond reconnection, drywall repair at chase cuts, asbestos handling on old duct wrap, and structural framing changes for new returns. Every one of those has ended somebody's margin on a changeout.

Startup, commissioning, and permit as visible lines

Charging to the manufacturer's subcooling target, verifying static pressure, and pulling the mechanical permit are real work that the lowball bid skips. Put them on the estimate as lines. It explains your price and it is the part that makes the equipment last.

Estimating mistakes that cost HVAC contractors money

Sizing from the old nameplate

The house got new windows and attic insulation since that 4 ton unit went in. Skipping the Manual J means bidding oversized equipment that costs more, cycles badly, and dehumidifies worse. Run the load and put the result on paper.

Reusing a line set without pricing the alternative

Old lines can carry oil and contaminants the new refrigerant will not tolerate, and buried lines are a gamble either way. Price a flush as the base case and new lines as the option, so the mid-job discovery is already a signed number.

Hiding the 80 to 96 percent conversion cost

The efficient furnace needs PVC intake and exhaust, a condensate route, and sometimes an orphaned water heater flue fix. That is several hundred dollars of real scope. Bid it visibly or lose the job to someone who hides it and then change-orders it.

Treating the thermostat, pad, and disconnect as freebies

A smart thermostat is about $188 in material, a pad $43, and the disconnect and whip have real cost too. Roll enough freebies into one flat number and the flat number stops covering the job. Itemize them.

Skipping commissioning to hit a price

An undercharged system fails in August and the callback eats every dollar the shortcut saved. Keep startup and charge verification as a line item you never discount, and say on the estimate what it includes.

Frequently asked questions

What should an HVAC estimate include?

Model numbers with the AHRI match, what is new versus reused, duct and line set by the foot, refrigerant by the pound, commissioning as a line, permit, exclusions for electrical and drywall, and an expiration date. Two bids without model numbers cannot be compared, and clients know it.

Why does a Manual J matter on a quote?

It is the load calculation that sizes the equipment to the actual house, envelope, windows, and orientation included. Matching the old unit's tonnage ignores twenty years of insulation and window changes. Right-sized equipment runs longer cycles, controls humidity, and lasts.

Should refrigerant really be priced by the pound?

Yes, because the charge depends on line set length and the equipment installed. R-410A material runs around $9.50 per pound, and long line sets need added charge beyond the factory fill. A per-pound line means a 60 foot run is not priced like a 15 foot run.

How long should an HVAC quote stay valid?

15 to 30 days. Equipment reprices multiple times a year, and the industry's move to A2L refrigerants has been reshuffling model availability. Put the date on the estimate and requote rather than eating a distributor increase.

How do I fill this template out fast?

Describe the changeout by voice and Eddie, Staxen's estimator, drafts this same structure with lines and prices for you to adjust and send for e-signature. Staxen is $59 per month per AI employee, or $149 for all three, and your first job is free with no card required.

Start free with Staxen: your first job is on us, no card required.