Air Handling Units (AHUs)
Design, installation and servicing of air handling units for commercial and industrial buildings.
- New AHU installation
- Replacement & upgrades
- Performance servicing
- Controls integration
Heating, Ventilation & Cooling (HVAC)
Commercial HVAC in Surrey, kept running properly.
Farnham-based HVAC contractor for Surrey and the South East: design, installation, servicing and maintenance of air handling units, chiller systems, ventilation and boiler-linked heating for commercial, industrial and residential buildings.
- AHUs, chillers & ventilation
- New build & retrofit projects
- Commercial, industrial & residential
- Surrey & South East coverage
Comfortable, efficient indoor environments
HVAC systems designed around the building, not a standard spec.
Our team specialises in the design, installation and servicing of air handling units, chiller systems, and supply and extract ventilation systems, as well as boiler installations, to keep indoor environments comfortable, energy-efficient and fully optimised.
Whether you’re outfitting a new build or upgrading existing systems, we offer HVAC solutions tailored to your requirements, supporting commercial, industrial and residential clients from our base in Farnham across Surrey, Hampshire, Berkshire and West Sussex.
ComGas Services UK Ltd
HVAC design, installation and servicing from Farnham, Surrey.
HVAC services
From air handling units to full ventilation strategies.
Choose a single system or bring air handling, cooling, ventilation and heating together in one coordinated HVAC project.
Chiller Systems
Chiller installation and maintenance to keep cooling systems reliable and efficient.
- Chiller installation
- Planned servicing
- Fault diagnostics
- Performance checks
Ventilation Systems
Supply and extract ventilation designed and installed for a range of building types.
- Supply & extract ventilation
- New build ventilation design
- System upgrades
- Ductwork installation
Boiler-Linked Heating
Boiler installations integrated with HVAC systems for consistent indoor comfort.
- Boiler installation
- Heating & HVAC integration
- Plant room coordination
- Planned maintenance
Planned. Professional. Practical.
Servicing and performance
HVAC maintenance that keeps systems optimised, not just running.
New build or existing system, HVAC equipment performs best when it’s serviced on a planned basis. We can review air handling units, chillers and ventilation systems, then agree a planned maintenance schedule, either as a standalone HVAC maintenance agreement or as part of a wider building-services contract.
Where upgrades are recommended, we explain the reasoning clearly so you can plan budget and timing before committing to further work.
- Planned HVAC servicing
- Performance and efficiency checks
- Controls and BMS integration where relevant
- Response options for faults, by agreement
- New build and retrofit experience
- One contact for HVAC queries
For existing customers
HVAC service history, available through the portal.
Existing ComGas customers can use the Customer Portal to view service information relevant to HVAC work carried out at their site.
- View relevant job and service information
- Access available reports and documents
- Track HVAC maintenance history
- Multi-site visibility where configured
Portal access is for existing ComGas customers. Available functions and document visibility depend on account and contract configuration.
Proven on site
View all projects
Ventilation projects we have delivered
Public Sector
Didcot Ambulance Resource Centre – Ventilation Plant & Ductwork Replacement
Replacement Nuaire supply and extract ventilation plant, roof-level ductwork and associated services, coordinated around a wider roofing programme at a busy operational ambulance resource centre.
View project
Education
South Farnham School, Farnham – Kitchen Extract Ductwork Replacement
Kitchen extract ductwork replacement at South Farnham School, where failed external weather protection was traced as the source of water entering the kitchen through the canopy.
View project
Who we work with
HVAC support across Surrey and the South East.
Commercial & IndustrialAHUs, chillers and ventilation for offices and industrial buildings.
Schools & EducationHVAC work planned around term dates and occupied buildings.
HospitalityComfort and ventilation support for hotels and guest areas.
Hotels & SpasHVAC systems suited to guest comfort and back-of-house demands.
Homes & ResidentialHVAC and boiler-linked heating for residential properties.
What clients say
Feedback from HVAC customers.
Reviews submitted by ComGas customers through Google.
Rated 5.0 out of 5 from 75 Google reviews.
"Really happy with the service! Matt came out to carry out our boiler service and was friendly, professional and did a great job."
Kerryann, Google review, September 2026
"First time we've used this company and it won't be the last. Very professional and efficient in everything they do…"
Ian, Google review, June 2026
"…ended up coming to my place of work and sorting an old heating system that hadn't worked for years in a car showroom & workshop. Great team of guys"
James, Google review, October 2025
HVAC FAQs
Questions about our HVAC services
Answers to common questions about HVAC design, installation and servicing.
Talk to the HVAC teamWhat HVAC services do you provide?
We design, install and service air handling units, chiller systems and supply and extract ventilation systems, as well as boiler installations that link into HVAC systems.
Do you design and install new HVAC systems?
Yes. Whether you are outfitting a new build or upgrading existing systems, we offer HVAC solutions tailored to your requirements.
Can you service existing air handling units and chillers?
Yes. We can review existing AHUs and chiller systems and agree a suitable planned servicing schedule.
Do you work on residential as well as commercial HVAC?
Yes. We support residential and commercial clients across Surrey and the wider South East.
Which areas do you cover?
We are based in Farnham, Surrey, and provide HVAC installation and maintenance across Surrey, Hampshire, Berkshire and West Sussex, with selected projects further afield. Contact the team with your postcode to confirm coverage.
Can HVAC work be combined with air conditioning or building management systems?
Yes. HVAC, air conditioning and building management systems are often coordinated together — see our Air Conditioning and Building Management Systems pages for related services.
Do you offer HVAC maintenance contracts in Surrey?
Yes. We can review your air handling units, chillers and ventilation systems and agree a planned maintenance schedule, either as a standalone HVAC agreement or within a wider service and maintenance contract that also covers heating, gas and electrical plant.
Do you install and maintain commercial ventilation systems?
Yes. We design, install and maintain supply and extract ventilation for commercial buildings, schools and kitchens. Examples include replacement ventilation plant and roof-level ductwork at Didcot Ambulance Resource Centre and kitchen extract ductwork replacement at South Farnham School.
Start a conversation
Planning an HVAC project or need an existing system reviewed?
Tell us about the building, current equipment and what you need the system to achieve. We can advise on next steps and arrange an assessment.
Enquiry
Request an HVAC assessment
For an urgent enquiry, please call our office directly.