Air Conditioning and Ventilation Systems.
~ Providing a Breath of Fresh Air! ~
Thoroughvent Ltd,

Air Conditioning & HVAC Specialists serving Sussex, Kent & Surrey

With over 20 years of experience, Thoroughvent Ltd is a trusted HVAC company specialising in the designing, supply, and installation of Air Conditioning, Ventilation, and Air Source Heat Pump systems. We proudly serve commercial clients across East Sussex, West Sussex, Kent, Surrey, and Hampshire.

Our services include:

  • Energy-efficient heating and cooling systems
  • Heat recovery and kitchen extract ventilation
  • System design, commissioning, repairs, and servicing

Conveniently based in Polegate near Eastbourne, we are ideally positioned to serve surrounding areas including Eastbourne, Hastings, Brighton, and Tunbridge Wells.

Contact Us us today for a free no-obligation site survey, quotation and expert advice tailored to your property.

Canteen Cooling
Cooling and Heating to Staff Room Canteen
Click Here
Kitchen Extract
Kitchen Extract system to Commercial Kitchen.
Click Here
Cassette Air Conditioning
Classroom Air Conditioning at College
Click Here
Air Source Heat Pump
Hot Water and Heating provided by an ASHP
Click Here

Air Conditioning | Installation

We install a wide range of air conditioning systems across Sussex, Kent and Surrey, helping businesses maintain comfortable indoor environments year-round.

Whether you require a split system for a single room or office, or a more complex 2-pipe (heating and cooling) or 3-pipe (simultaneous heat & cool) VRF/VRV system for larger commercial premises, we deliver high-efficiency, bespoke solutions tailored to your building’s layout and operational needs.

Our services include:

  • Heat load calculations – ensuring optimal system performance and energy efficiency.
  • System selection and design – tailored to your building layout, workspace, user patterns and budget.
  • Free site surveys and quotations – with no obligation, helping you plan with confidence.

We install leading brands that offer reliability, quality finish, and high efficiency. Whether you’re upgrading an outdated system or installing new units, our expert engineers and sales team ensure a seamless install with minimal disruption.

Our team also provides ongoing servicing and maintenance plans to keep your investment running smoothly, whilst ensuring F-Gas compliance.

Visit our Air Conditioning info and Gallery pages for more.

Ventilation | Commercial systems

We design and install high-performance commercial ventilation systems across Sussex, Kent and Surrey, helping businesses maintain healthy indoor environments and meet-or exceed regulatory standards.

Our ventilation solutions are suitable for a wide range of commercial properties, including offices, retail spaces, restaurants, schools, hospitals, and commercial kitchens. 

We ensure our systems are selected to ensure optimal indoor air quality, whilst  being designed and built to meet-or even exceed-current regulatory standards.

Our services include:

  • Heat recovery ventilation systems – Improving indoor air quality, whilst promoting air circulation, increasing efficiency by recovering heat from the extracted air.
  • Bespoke ventilation solutions from toilet blocks to hospital operating theatres – Each is tailored to the specific environment.
  • Airflow testing, balancing and commissioning reports – meeting building regulations and compliance standards.

By carrying out a free site survey, we are able to ensure that a system we install is quiet and considerate to neighbours, whilst being easy to maintain.

Visit our Ventilation info and Gallery pages for more.

Air Source Heat Pumps | Hot Water & Heating

Air Source Heat Pumps (ASHPs) offer a sustainable cost-effective and energy-efficient solution for providing heating and hot water.

At Thoroughvent Ltd, we help businesses across Sussex, Kent, and Surrey reduce their carbon footprint and energy bills by switching to high-efficiency ASHP systems.

ASHPs reject heat into the water system by cooling the outside air—even in colder months! Wit the rejected heat they are capable of satisfying both heating, and hot water demands. 

They are ideal for our commercial clients looking to reduce or meet their environmental targets and create low-carbon buildings.

Our services include:

  • Bespoke system selection and design – tailored to your heating and hot water requirements and usage patterns.
  • Integration with building layout – We ensure minimal disruption during installation and optimal performance through competent selection, configuration and placement. 
  • Full installation and servicing – Including commissioning and maintenance plans to keep your investment efficient year round.

We work with leading ASHP brands (and even carry out troubleshooting and repair works for some manufacturers too). Whether you’re retrofitting an existing building or planning new. Our team delivers reliable, future-proof heating solutions.

Visit our ASHP Info and Gallery pages to see other businesses are benefiting from ASHP technology.

Frequently Asked Questions
Do you offer free site surveys

Yes — we provide free, no-obligation site surveys for all commercial HVAC projects. This allows us to assess your property and recommend the most efficient solution. Use our Contact Us pages to start your enquiry today.

What types of properties do you work with?

We specialise in commercial environments, including: Offices and retail spaces, Restaurants and commercial kitchens, Schools and hospitals, Warehouses and industrial units. We also consider residential projects, but this is on a per application basis. Visit our Services page to find out more.

What is a heat recovery ventilation system?

A heat recovery ventilation (HRV) system extracts stale air from your building while recovering heat to warm incoming fresh air. It improves indoor air quality and reduces energy consumption — ideal for commercial kitchens, toilets, and healthcare settings. See our Ventilation pages for more.

What air conditioning systems do you install?

We install: Split type units for single rooms, Multi-split and VRF/VRV systems (2-pipe and 3-pipe) for larger commercial premises, Energy-efficient heating and cooling systems tailored to your building layout. See our Air Con pages for more.

Do you offer Call Outs, servicing and maintenance?

Yes — we offer ongoing service and maintenance contracts for the systems we install. Regular maintenance helps ensure compliance, maintains efficiency and extends system life span. We also provide call-outs, troubleshooting, and servicing for existing HVAC systems, even if we didn’t install them. See our Servicing and Call Out pages for more info.

Are air source heat pumps suitable for commercial buildings?

Absolutely. Air Source Heat Pumps (ASHPs) are ideal for commercial heating and hot water. They’re energy-efficient, low-carbon, and can help meet sustainability targets.

What areas do you cover?

We serve clients across: East & West Sussex, Kent, Surrey and Hampshire.

Are you certified or accredited?

Yes — we hold F-Gas industry certification, ensuring all work meets UK regulations and safety standards. We also carry Employers’ and Public liability insurance.