Separate contractor-market figures, supplier claims and buying costs.
Contractor turnover is not spending on AI. These figures have different scopes and reference periods and should not be added together or treated as comparable market sizes.
Verified Market Size’s reproduction of ONS Annual Business Survey data; checked by that publisher 24 September 2026; ONS dataset released 26 May 2026. (verifiedmarketsize.com)
Secondary-reported official statistic. Broad contractor-industry turnover; not independently re-extracted here.
Desk calculation from the same reproduction: £23.238bn to £24.032bn; calculated 27 October 2026. (verifiedmarketsize.com)
Not inflation-adjusted; not AI-spending growth.
Tom Riley SEO’s reproduction of ONS/Nomis UK Business Counts; page reviewed 27 October 2026. (tom-riley.co.uk)
Secondary-reported count , not a verified 2026 total. VAT/PAYE-based enterprises, rather than a list of qualified agency buyers.
Same secondary reproduction, reviewed 27 October 2026. (tom-riley.co.uk)
Shows why a broad company list substantially overstates the established-employer audience.
Desk subtraction: 47,050 − 40,340; calculated 27 October 2026 from the reported counts. (tom-riley.co.uk)
A screening denominator only. It includes larger firms and office employees, not just field engineers.
Do not confuse the underlying contractor industry with the AI supplier market.
The defensible starting point is the broader plumbing, heating and air-conditioning installation category—not a purported census of AI-ready HVAC firms.
Current UK HVAC-specific AI supplier revenue, paid adoption and annual purchasing volume remain unknown in the evidence reviewed.
The evidence supports growing general AI use, but not a verified HVAC agency-spending growth rate.
Published offers span low-cost software add-ons, managed call handling and separately scoped integration projects.
Usage can materially change the economics of an otherwise fixed monthly proposal.
The clearest disclosed capital activity is in field-service software, while recent product activity broadens the alternatives to bespoke agencies.
Sometimes—but compare supported actions, not marketing labels.
Yes, but qualitative adoption signals are not market-volume evidence.
Budget for supervision, exception handling and data governance—not just implementation and minutes.
The strongest evidence supports a procurement market with widening choice, not a verified high-growth HVAC AI spending category.
Read →Review the source material cited in this section.
Read →Editorial self-assessment from the research pack; these are not independent ratings or verified outcomes.