STAY COOL.STAY WARM.
Cinematic-quality air conditioning installation, servicing and 24/7 maintenance for London's most demanding homes, offices and grade-A buildings. F-Gas certified. Chauffeur-grade engineers. Same-week availability.
- 01F-Gas Certified
- 02Daikin D1+ Partner
- 03Same-week install
- 0424/7 emergency
Trusted by leading UK organisations
Numbers we publish, not numbers we promise
Operational KPIs measured continuously across our active client estate.
Target 95% · Contract clients
Reactive callouts, last quarter
All planned maintenance visits
Year-on-year contract renewal
Measured against legacy DX systems
F-Gas mandatory inspections
Six disciplines. One studio, one signature.
Every commission moves through the same engineering craft — adapted to its building, its brief and its borough. Tap any discipline to see how it shows up in real London work.
Residential AC
Discreet, acoustically modelled split and multi-split cooling for prestige homes, apartments and listed conversions.
- Concept to handover
- Acoustic survey
- Bespoke pipework routing
Commercial HVAC
VRF, chillers, AHUs and BMS-integrated comfort cooling for grade-A buildings — engineered for the long term.
- Cat A & Cat B fit-out
- BMS integration
- Out-of-hours install
VRF & VRV Engineering
Heat-recovery refrigerant systems engineered for multi-zone offices, hotels and high-end mixed-use schemes.
- Daikin VRV 5 specialist
- Mitsubishi Hybrid VRF
- Heat-recovery design
Heat Pumps & MVHR
Low-carbon air-source and hybrid heat pumps with heat-recovery ventilation — installed by MCS-aware engineers.
- Air-source design
- MVHR commissioning
- BUS grant guidance
Service & PPM
F-Gas certified planned preventive maintenance with written SLAs, asset registers and quarterly reporting.
- F-Gas Reg compliance
- Asset register & QR tagging
- Quarterly board reports
24/7 Emergency
One-hour P1 response for trading floors, server rooms, restaurant kitchens and critical environments across London.
- P1 1-hr response
- Stocked vans, 14 brands
- Temp-cooling hire fleet
Engineered.Not improvised.Cool always.
Every CoolNest project begins with a CIBSE-grade thermal model and ends with commissioning data signed off by the lead engineer. No subbies. No corner-cutting. No 28-degree boardrooms in August.
- Thermal modelledCIBSE TM52 compliant
- Acoustically tuned<35 dB indoor
- Low-GWP refrigerantR32 / R454B only
- Commissioned dataSigned handover
End-to-end climate solutions
One contract, one accountable engineering team — from concept design through commissioning and lifecycle care.
All servicesCommercial HVAC
VRF, chillers, AHUs and BMS-integrated comfort cooling for grade-A buildings.
Learn moreAC Installation
Bespoke split, multi-split and VRF systems engineered to your space.
Learn moreResidential Cooling
Discreet, acoustically modelled cooling for prestige homes and apartments.
Learn moreRepairs & Diagnostics
F-Gas certified diagnostics with same-day response across London.
Learn more24/7 Emergency
P1 1-hour response cover for trading floors, kitchens and data rooms.
Learn moreEnergy & MVHR
Heat pumps, low-GWP refrigerants and heat-recovery ventilation.
Learn moreA five-stage engineering process
The same disciplined workflow on every project, from a single split unit to a multi-site VRF rollout.
- 01
Site survey
Heat-load assessment, asset audit and acoustic review at no cost.
- 02
Design
CAD drawings, refrigerant pipework routing and BMS integration plan.
- 03
Install
F-Gas certified teams, out-of-hours installs available, dust-free finish.
- 04
Commission
Test, balance, leak-tightness verification and handover documentation.
- 05
Maintain
PPM contract with priority SLAs and live asset reporting.
A complete range of cooling solutions
From a single bedroom split to a 1.2 MW industrial chiller — we design, supply, install and maintain it all.
Heat Pump (Reverse-cycle)
Cool + Heat year-round
- Efficiency
- 400%
- Refrigerant
- R32
- BUS Grant
- Eligible
Cassette AC (4-way)
3.5 – 14 kW
- Coverage
- 40–120 m²
- Airflow
- 4-way
- Profile
- Slim
VRF / VRV System
Up to 64 indoor units
- Zones
- Unlimited
- Heat-recovery
- Yes
- Footprint
- 1 outdoor
Ducted / Central HVAC
10 – 80 kW
- Floors
- Multi
- MVHR
- Optional
- BMS
- Integrated
Industrial Chillers
50 – 1,200 kW
- COP
- 5.2
- Type
- Air / water
- Sectors
- Data, Mfg
Precision Cooling
Data centre / server room
- Uptime
- 99.99%
- Tolerance
- ±0.5°C
- Redundancy
- N+1
Get a price in 30 seconds
Three quick questions and we'll show you a realistic price range — no email required.
What type of property?
Beat the heat this summer.
Fast-track installation, same-week availability across London. Stay cool when it matters.
Book Summer InstallStay warm all winter.
Heat-pump systems up to 400% efficient. One unit, cooling and heating, year-round comfort.
Enquire About Heat PumpsSector-specific climate engineering
Different buildings, different obligations — we engineer to the standards your sector demands.
Commercial offices
VRF, AHUs and BMS-integrated comfort cooling for grade-A workspaces.
Data & comms rooms
Precision cooling, N+1 redundancy and 24/7 critical-environment cover.
Healthcare
HTM-compliant ventilation, theatre cooling and consulting suites.
Hospitality & F&B
Kitchen extract, dining-room comfort and hotel guest-room systems.
Retail & flagship
Storefront cooling that meets brand acoustic and aesthetic standards.
Education
Classroom IAQ, MVHR and BB101-compliant ventilation upgrades.
London-wide, same-week availability.
From Mayfair to Croydon, Shoreditch to Richmond — our engineers cover every London borough and the surrounding home counties.
Spread the cost — 0% finance available on installations over £500. No deposit options.
Mayfair trading floor — VRF retrofit
Replacing legacy DX cooling across a 4-floor trading operation with zero downtime.
Commercial · 2,400 m²- Building
- Grade II listed, Mayfair W1
- System
- Daikin VRV 5 heat-recovery
- Refrigerant
- R32 (low-GWP)
- PPM
- Gold contract, 1hr P1 SLA
"CoolNest planned every overnight phase to the minute. Eight a.m. Monday, every desk was cool. Flawless."View all case studies
Audit-ready, every project
Independently verified to deliver to UK regulatory and industry standards.
A field-service platform built around your estate
Every contract client gets live access to job tracking, engineer schedules, asset registers and compliance documentation.
- Live job dispatch
- Engineer scheduling
- F-Gas & TM44 logs
- Asset register
- Invoice & PO management
- SLA reporting
Service plans built around uptime
Three transparent tiers. Mix and match across your asset estate.
- Annual PPM visit
- F-Gas leak inspection & log
- Filter & condensate clean
- Digital service report
- Bi-annual PPM visits
- Priority phone & email support
- Discounted parts & labour
- Live asset dashboard
- Quarterly PPM visits
- Unlimited reactive callouts
- Out-of-hours cover included
- Dedicated account engineer
Frequently asked questions
Honest, plain-English answers to the questions we hear every week.
Engineering you can underwrite.
12-month workmanship warranty
On every install and repair, in addition to manufacturer cover up to 7 years.
Response-time guarantee
Contract clients receive written SLA-backed response targets — or fees waived.
Manufacturer accredited
Daikin D1+, Mitsubishi Diamond Quality Partner, Panasonic Pro.
"We've worked with three HVAC contractors across our portfolio. CoolNest is the only one we've kept.Their reporting, their engineers and their commercial discipline are in a different league."
Daniel Ross — Head of Facilities, Northbank Estates
Engineering notes from the field.
Buying guides, compliance updates and lessons from live installs — written by the engineers who run them.
How Much Does Air Conditioning Cost in London in 2026?
A transparent breakdown of installation, running and maintenance costs for residential and commercial AC across London.
F-Gas Regulations Explained: A UK Business Owner's Guide
What every facilities manager needs to know about F-Gas Regulation 517/2014, leak checks, record-keeping and the 2026 phase-down.
VRF vs Split Systems: Which Is Right for Your Building?
A practical comparison of VRF, multi-split and traditional split systems for commercial and residential applications.
Engineer your next projectwith CoolNest.
Free site survey, fixed-price proposal, written response within one business day.