Heating · Cooling · Plumbing — one accountable team
Heating, cooling & plumbing across South Hertfordshire and North London — one team that turns up, does it right, and proves it.
Get a real price in 60 seconds, book a slot that suits you, and deal with a local team that actually answers.
No “prices from £XX*” games
Tell us your postcode and the job, and we'll show you a real installed range — instantly, before you give us a single contact detail.
See your installed price range now
Postcode + job — no callback required, no details harvested.
Why people stay with us
Certainty
It gets done — on time, to standard, and we prove it. Every job documented.
Reachable
Real people who answer the phone and turn up when they said they would.
Legit
Gas Safe registered, F-Gas certified, fully insured. Verify us any time.
Craft
Done right, done tidy, built to last. The details are the difference.
How it works: price it → book a provisional slot → we confirm → done right, tidied up, proven.
Property or facilities manager?
One accountable HVAC supplier for the City, Westminster & Hertfordshire — documented, on-SLA, audit-ready. Commercial →
Your questions, answered
- Which areas do you cover?
- Covering St Albans, Harpenden, Welwyn, Hatfield, Potters Bar, Borehamwood, Barnet & across South Hertfordshire and North London. Commercial: City of London & Westminster.
- Are you Gas Safe registered?
- Yes — Datum is Gas Safe registered and F-Gas certified for air conditioning work, and fully insured. Ask for the card on the door; verify us on the Gas Safe Register any time.
- Do you really give fixed prices?
- Yes. A fixed price agreed before we start, in writing, with what's included and what's not. If something genuinely changes mid-job, we stop and talk to you first — no 'while we're here' surprises.
- Can air conditioning heat my home too?
- Yes — modern air conditioning is an air-to-air heat pump: cooling in summer, efficient heating in winter, one system. Under the Boiler Upgrade Scheme there's a £2,500 grant where your home and installation qualify; we confirm eligibility at the free survey.