HVAC installs are scheduled tight — equipment delivered, crew booked, sometimes a crane on the clock. When a surprise appears, the cost of waiting for approval compounds by the hour. That’s exactly why HVAC extras so often proceed on a verbal nod, and why they’re so often disputed later.
Where HVAC extras come from
- Ductwork reality: the existing trunk is undersized, crushed, or leaking — the new equipment can’t breathe through it
- Line set problems: the refrigerant lines are the wrong size or unserviceable, and the run is longer than quoted
- Electrical prerequisites: the new unit needs a circuit or disconnect the old one never had
- Venting and code: flue or combustion-air requirements changed since the last install
- Access surprises: the air handler sits somewhere the estimate’s hours never imagined
The homeowner-at-work problem
HVAC has a scheduling quirk: the person home during the install often isn’t the person who signs. Don’t collect approval from whoever answers the door — that’s a classic dispute. Send a remote signing link to the actual decision-maker: they see the line items and the photo of the crushed duct in their browser and sign from their desk, while your crew keeps working on the original scope.
A real example
Mid-changeout, the return plenum turns out to be half the size the new air handler needs. In ScopeProof: photo, line items — Return plenum, fabricated $310 · Additional labor 3 hr × $95 — reason: “Existing return undersized for new equipment; airflow below spec without correction.” Link sent to the homeowner at work; signed in eleven minutes; install never stopped.
Approve the extra before the crane leaves
HVAC extras block everything behind them. ScopeProof prices the surprise in line items, gets the homeowner’s signature on your phone — or a remote link to the one at work — and the install keeps moving.
