Step 1 — Gather the job details on-site
A good estimate starts with good inputs. Before you price anything, capture the basics: home square footage, the existing equipment type and age, the scope (replacement, repair, new install, or service), and any access constraints.
Take photos of the outdoor unit, the indoor air handler or furnace, and the electrical panel/disconnect. Photos protect you later and let you spot condition issues — rust, undersized disconnects, cracked pads — that turn into line items.
Step 2 — Size the equipment correctly
Sizing drives both comfort and cost. A Manual J load calculation is the gold standard; a square-footage rule of thumb (≈1 ton per 400–600 sq ft) is a reasonable starting point for a ballpark. Oversized equipment short-cycles and wastes money; undersized equipment never satisfies the thermostat.
Step 3 — Build the line items
Break the job into clear, itemized components. A homeowner who sees exactly what they're paying for is far more likely to sign than one handed a single lump-sum number.
- Equipment: condenser, coil, air handler/furnace, thermostat.
- Labor: removal/disposal of the old system and installation of the new one.
- Materials: line set, refrigerant, pad, whip/disconnect, duct transitions, fittings.
- Code & permits: permit fees, inspection, and any electrical upgrades.
- Optional add-ons: surge protector, UV light, media filter, maintenance plan.
Step 4 — Apply consistent pricing and markup
Decide whether you price flat-rate or cost-plus, and apply it consistently. Account for material cost, labor hours at your loaded labor rate, overhead, and target margin. Saving your common setups (AC swap, furnace, mini-split) as templates keeps pricing consistent across techs and removes guesswork.
Step 5 — Present, sign, and collect on the spot
The estimate that closes is the one delivered while you're still standing in the driveway. Hand over a branded PDF, walk through the line items, capture an e-signature, and collect a deposit before you leave. Speed and professionalism win the job.
This is exactly what Fast Estimate automates: snap the photos, enter the details, let AI draft the line items (with condition notes from the photos), then send a branded PDF the customer signs on their phone. See how it stacks up against other tools on our comparison page, or start free and build your first estimate in minutes.