Air conditioning and refrigeration for homes and businesses across Cambridgeshire and London. Considered design, careful installation, and support that continues long after the invoice is settled.
Installation, maintenance and repair, from a single bedroom unit to a full retail estate. Residential or commercial, the same engineers look after it all.

Every system is sized on a calculated heat load rather than an estimate. We route pipework discreetly wherever the building allows, and leave the space as we found it.

Planned visits that maintain efficiency and reduce unplanned downtime. You receive a written report after every service, along with the F-Gas records you are required to hold.

A clear diagnosis, explained in plain terms, and common parts carried on the van. When refrigeration fails there is stock at risk, so repairs are treated as a priority.
Quiet, low-energy systems for living rooms, bedrooms, kitchens, extensions, garages and loft conversions, a single room or the whole house. The same units heat the room in winter at a lower running cost than a gas boiler. Fixed quotations, considerate installation, and honest advice on what you actually need.
Offices, restaurants, pubs, shops, supermarkets, gyms, salons, clinics, care homes, schools, server rooms and cold stores. Designed around your opening hours, installed outside them, and supported by a maintenance agreement with a four-hour response.
A maintained system draws less power, lasts considerably longer and is far less likely to fail when it matters. Choose the level of cover that suits you.
Ongoing support for efficient, reliable and comfortable home air conditioning.
Planned maintenance and clearer oversight of workplace systems.


Sygnum Group was founded by an engineer who has spent his career installing, maintaining and repairing cooling systems in everything from supermarket plant rooms to hospital chillers to domestic bedrooms. He has experienced an industry full of good engineers let down by poor process: undocumented work, inconsistent handovers, and advice given by people who would never set foot on site. He decided to build something different.
Sygnum was built the way a regulated business is run. We call it the Sygnum Standard: every survey, every decision and every job documented, evidenced and traceable. The principle is simple. The person who quotes the work is accountable for it. In practice that means directly employed engineers, no call centre, and the same standard of work whether it's one bedroom or eleven sites.
We apply the governance of a regulated industry to an engineering business. Survey findings, equipment reasoning, commissioning data, F-Gas records and every agreed variation are documented and kept, so if we return to your system in five years, its history can be read.
Read the Sygnum Standard →"Two units in a Victorian semi with nowhere obvious to run the pipes. They found a way, and you'd never know they'd been."
"Walk-in went down on a Saturday night. Engineer was there in ninety minutes and we opened Sunday as normal."
"Took over the contract on eleven sites. First thing they did was fix the paperwork the last lot had never done."
Tell us what you need and we will confirm your price. Prefer to talk it through first? Call us. There is no obligation either way.