HVAC is a trade where somebody sits at a kitchen table, quotes a number nobody was budgeting for, and then has to be trusted inside the house for two days. I have spent the last two years filming trades with exactly that problem, and the marketing that works is the same.
Filming days spent following one family from first sales call to installation
Shoot day is usually all it takes to cover techs, trucks, and a real install
Stock footage of somebody else's technician holding a gauge

The whole job is convincing a homeowner before the tech ever knocks on the door.
We talk for thirty minutes about what your customer is actually worried about and what you are trying to move. No pitch on that call.
I shoot on jobs you already have booked, working around your techs rather than holding up a truck, because nobody has a spare install day in January.
Finished pieces come back inside a week, plus the full library, so your next launch does not need another shoot.
Straight with you: I have not filmed an HVAC contractor yet. What I have done is follow an in-home sale from the kitchen table through to installation, and make a film for a trade that works inside people's houses. If you want to be the first HVAC company here, that is a good position to be in.

One family followed from the first in-home sales call to installation day. The same shape as an HVAC sale.

A trade that works inside people's homes, and a film about why they can be trusted there.

Equipment built for contractors, filmed for an audience of contractors.

A creative studio in Lancaster County, Pennsylvania. Brand films, photography, and design for family-owned manufacturers, outdoor structure companies, and trades businesses.
Narrative film work lives at Stump & Root Films.