In the UK
23 sections, about 10,900 wordsRenewals and deadlines Greymill tracks
- TM44 air conditioning inspection dueAt renewal
- F-gas company certificate three-year renewalAt renewal
- Gas Safe registration renewalYearly
- MCS certification and applicable consumer-protection renewalYearly
- Employers' liability insurance renewalAt renewal
Figures Greymill knows, with their sources
- £2,500Boiler Upgrade Scheme grant for an air-to-air heat pump in a home.As of Oct 2026. Source: gov.uk
- £7,500Boiler Upgrade Scheme grant towards an air-to-water or ground source heat pump, in England and Wales.As of Oct 2026. Source: gov.uk
- 5 t CO2eF-gas charge in tonnes of CO2 equivalent from which equipment needs a leak check at least every 12 months.As of Oct 2026. Source: legislation.gov.uk
Words of the trade it understands
- leak check
- F-gas log
- tonnes CO2 equivalent
- recovery
- PPM
- asset register
- SFG20 and the service report
- commissioning
In the US
22 sections, about 10,700 wordsWritten for hvac, heating and cooling in the US.
Renewals and deadlines Greymill tracks
- Contractor license renewalAt renewal
- Insurance and contractor bond renewalYearly
Figures Greymill knows, with their sources
- $8,000Home electrification rebate (HEAR) cap for a qualifying heat pump, where the state runs the program.As of Oct 2026. Source: uscode.house.gov
- 10%EPA leak rate that triggers a repair on comfort cooling holding 15 lb or more of HFC refrigerant.As of Oct 2026. Source: ecfr.gov
- 700GWP ceiling for refrigerant in new home AC and heat pump systems under the EPA Technology Transitions rule.As of Oct 2026. Source: ecfr.gov
Words of the trade it understands
- service call
- change-out
- proposal with model numbers
- AHRI match
- tune-up
- maintenance agreement
- membership
- PM contract
Questions owners ask
Is there an AI for heating, ventilation and air conditioning?+
Yes. Greymill is an AI team for small businesses that is briefed on heating, ventilation and air conditioning, written separately for the UK and the US: 23 sections for the UK and 22 for the US, about 21,600 words of reviewed industry knowledge, as of Oct 2026.
Which renewals and deadlines does Greymill track for heating, ventilation and air conditioning in the UK?+
In the UK: TM44 air conditioning inspection due (at renewal); F-gas company certificate three-year renewal (at renewal); Gas Safe registration renewal (yearly); MCS certification and applicable consumer-protection renewal (yearly); Employers' liability insurance renewal (at renewal). As of Oct 2026.
Which renewals and deadlines does Greymill track for heating, ventilation and air conditioning in the US?+
In the US: Contractor license renewal (at renewal); Insurance and contractor bond renewal (yearly). As of Oct 2026.
Which figures does Greymill know for heating, ventilation and air conditioning in the UK?+
Boiler Upgrade Scheme grant for an air-to-air heat pump in a home: £2,500 (gov.uk, as of Oct 2026). Boiler Upgrade Scheme grant towards an air-to-water or ground source heat pump, in England and Wales: £7,500 (gov.uk, as of Oct 2026). F-gas charge in tonnes of CO2 equivalent from which equipment needs a leak check at least every 12 months: 5 t CO2e (legislation.gov.uk, as of Oct 2026).
Which figures does Greymill know for heating, ventilation and air conditioning in the US?+
Home electrification rebate (HEAR) cap for a qualifying heat pump, where the state runs the program: $8,000 (uscode.house.gov, as of Oct 2026). EPA leak rate that triggers a repair on comfort cooling holding 15 lb or more of HFC refrigerant: 10% (ecfr.gov, as of Oct 2026). GWP ceiling for refrigerant in new home AC and heat pump systems under the EPA Technology Transitions rule: 700 (ecfr.gov, as of Oct 2026).
Does Greymill replace my accountant, solicitor or other professional advisers?+
No. Greymill gives you a whole team to think with every day: the numbers modelled, the contract read, the campaign planned, the hire prepared, the filing checklist ready, all before you speak to anyone by the hour. What Greymill produces is software output from the information you give it, so Greymill takes no instruction, owes no professional duty and files nothing unless you send it yourself. Where a matter needs a regulated professional to sign it off, Greymill says so and tells you exactly what to take to them. Customers arrive at their accountant or lawyer with the work done and the questions sharp, which is usually the cheapest hour they will ever buy.
How much does Greymill cost?+
Plans start at £100 a month plus VAT in the UK and $130 a month plus tax in the US. Every plan starts with a 7-day free trial on full Scale access, no card needed.
How Greymill helps
Tell Greymill about your business once. Its sixteen specialists share one memory of it, so the one you ask already knows your trade, your country and your numbers. Connect your books and inbox. Nothing is sent unless you press Send, and your books change only when you press Approve. Greymill files nothing unless you send it yourself and is not a regulated adviser: where a matter needs one, it says so and tells you what to take to them.