13.5% across the 104 HVAC contractor websites we inspected.

HVAC adoption is by far the lowest measured, at roughly a third of the remodeling rate. That is defensible. Nobody is moved by a photograph of a tidier furnace. The trust job that a gallery does in remodeling is being done by named testimonials in HVAC, and the testimonial numbers bear that out.

That puts HVAC below the combined figure of 34.2% across all 380 brands , by 20.7 percentage points. Here is the same measurement in the other two trades we inspected.

Trade	Before and after galleries	Sites
HVAC (this page)	13.5%	104
Roofing	39.2%	130
Remodeling	44.5%	146

Why it costs you work

A finished-work photo shows competence. A before and after shows transformation, and transformation is what the customer is actually buying. They are not buying shingles. They are buying the version of the house where the ceiling stain is gone.

Checking your own HVAC site

You do not need a slider plugin. Two photos side by side with honest labels beat a fancy component nobody can operate on a phone. What you do need is the before shot, which means telling the crew to take one before they start.

Everything else we measured on HVAC sites

Measurement	HVAC
Sites people with disabilities cannot use	64.4%
Sites that are hard to use for the disabled	98.1%
How long sites take to load on a phone	6.24s
Quote form field count	29.9%
Multi-step forms	1%
Named customer testimonials	52.9%

What was measured: Share of brands a before/after gallery was detected for (inclusive; the value the trust-signal chart plots).
How we measured it: We looked for a before and after comparison anywhere on the site, counting both the drag-across sliders and plain labelled photo pairs.
The technical version, for anyone checking our work: html_and_dom_facts union with score-narrative fallback
Scope: detected (inclusive)
Denominator: 104 HVAC brands.
Collection window: 2026-05-10 to 2026-05-16
Who ran it: Fervor Studio, first-party capture. Nobody paid to be included or excluded.

This measurement across every trade: Before and after galleries. How the capture works: the methodology.

The full report behind the HVAC numbers: State of HVAC. Or see how individual HVAC brands scored on the HVAC leaderboard.