Custom Heating & Cooling

Residential & Commercial HVAC

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Heating, Ventilation & Air Conditioning

Installation, Service & Repair.

Horsham & Surrounding Areas.

Domestic Natural Gas, LPG & Oil

Installation, Servicing & Maintenance of 

Boilers, (System, Combi & Heat Only Boilers) Cookers, Ranges, Hobs, Water Heaters, Fires, Space Heaters, Warm Air, Domestic Swimming Pool Boilers, Pipework, Flues, Homeowner & Landlord Gas Safety Certificates, Heating Controls, Pumps & Zone Valves etc. Park Homes & Caravans.

Commercial Natural Gas

Servicing & Maintenance of

Plant Rooms, Package Burners, Commercial Gas Boilers, Indirect Fired Air Heaters, Direct Fired Air Heaters, Overhead Tube Heaters, Plaque Heaters, Continuous Flow Instant Water Heaters, Storage Water Heaters, Commercial Pipework, Commercial Swimming Pool Boilers, Strength Testing & Purging, Commercial Gas Safety Certificates.


Servicing & Maintenance of

Mechanical Ventilation Plant - AHU, MAU, FCU, PU, RTU, HRU and Water to Air Units (domestic AQUAIR HIU Warm Air Replacement).

Heat Interface Units (HIU).

Vented & Unvented Domestic Hot Water Storage Cylinders, Commercial Calorifiers, Buffer Tanks, Accumulators & Pressurisation Units.

Air Conditioning 

Servicing & Maintenance of

Mini & Multi Split Air Conditioning Units, Inverters and Heat Pumps.

REFCOM Registered REF1018253

Leak checking, decommissioning, refrigerant recovery, commissioning, refrigerant charging, servicing and maintenance of equipment containing Fluorinated Gases (F-Gas refrigerants).


Servicing & Maintenance of all Heat Pumps.

Experienced with LG, Grant, Dakin, Mitsubishi, Hitachi, Nibe, Vaillant, Viessmann, Samsung, Toshiba, Fujitsu, Panasonic, Bosch, ElectriQ, Daitsu & Media. 

Emergency Plumber

All Plumbing Repairs, From Dripping Taps to Toilet Cisterns, Siphons, Float Ball Valves, Stopcocks, Overflows, Radiators, Showers, Sinks, Basins, Baths, Outside Taps, Cylinders, Immersion Heaters, Tanks, Hot Tubs, Tap Washers and Pipework Leaks.

Water Treatment & Legionella

Risk Assessments, Flushing & Monitoring, Legionella Testing, System Dosing, Disinfection of TMV’s, Chlorination of Calorifiers and Tanks, Hot Tub Service & Safety Checks.


Installation of Heating Controls, Smart Wi-Fi Thermostats, Air Conditioning Control, Gas Boiler wiring, Residential Heating and UFH underfloor heating wiring specialists.

Hello and welcome to Custom Heating & Cooling, we are a small local team of heating engineers, Specialising in residential and commercial HVAC systems, we are based in Horsham, and have many years of experience, we started in the industry back in 1996.

We specialise in the installation, maintenance and repair of both domestic & commercial gas, lpg and oil, covering boilers and heating equipment, we also cover air conditioning and ventilation systems. Park homes and caravans.

We also offer comfort upgrades to heating controls and connected home products, our engineers have had full training to fit various Smart-Home products, including Honeywell Evohome, Hive and Nest smart thermostats.

We also maintain swimming pool boilers, eg Certikin Genie. 

We offer heating water treatment solutions too, from a system water check via a professional laboratory, to chemical treatment and magna cleanse power flushing. We also descale and de-sludge blocked combi plate heat exchangers. 

We offer Legionella Risk Assessments, Flushing and Monitoring of Hot and Cold water Systems.

We are approved with various manufacturers installer schemes, which allows us to offer extended warranties on all the replacement boilers that we install.

We are experts in boiler maintenance and highly trained to work on Worcester, Vaillant, Glowworm, Ideal, Baxi and Potterton boilers. We are confident that we will be able to fix any boiler or heating breakdown that you might experience. 

We are very passionate about our industry and are 100% committed to all of our customers, we even offer a free 1st year service with all new boiler replacement installations that we carry out.

We are at the end of the phone 24/7 for all our existing customers, you can contact us via our contact page and we will get back to you ASAP

Covering Horsham District

Southwater, Itchingfield, Horsham, West Horsham, Slinfold, Nuthurst, Coolham, Five Oaks, Roffey, Shipley, West Grinstead, Warnham, Billingshurst, Lower Beeding, Cowfold, Partridge Green, Faygate, Shermanbury, Rudgwick, Rusper, Wisborough Green, Slaugham, Thakeham, Botney, Bolney, Staplefield, Ashington, Handcross, Ockley, Ashurst, West Chiltington, West Chillington, Capel, Loxwood, Twineham, Bodiam, Alfold, Henfield, Ewhurst, Kirdford, Pulborough, Washington, Mole Valley, Ifield, Newdigate, Stopham, Cranleigh, Plaistow, Hardham, Cuckfield, South Nutfield, Storrington, Woodmancote, Steyning, Bramber, Upper Beeding.

Working with quality products from quality brands


All Work Completed by Crawley HVAC Services
Check out the Verified profile for Crawley HVAC Services here Verified by Expert Trades
£2 Million Public Liability Insurance
Waste Carrier Licence CBDL375915
Up to Date DBS Check Completed 2021-04-15

Gas Safe registered

We are Gas Safe registered (reg #596272), which is a legal requirement for anyone carrying out work with gas such as boiler servicing or gas safety certificates. Our registration covers both domestic and commercial gas works. 

Gas Safe registered

REFCOM registered

Please note that we are registered with REFCOM (reg REF1018253), which is the UK's leading organisation for F-Gas certification. Please have a look at our REFCOM certificate here.

Based in Horsham

Horsham, Southwater, Broadbridge Heath, Slinfold, Billingshurst, Steyning, Storrington, Ashington, Rudgwick, Cowfold, Pulborough, Warnham, Henfield, Upper Beeding, Partridge Green & Faygate.

Specialising in boiler breakdowns & repairs

Also offering boiler, air conditioning and smart thermostat upgrades. No job too big or small.

Honest pricing

We offer honest and transparent pricing so that you know exactly how much a job is going to cost. We don't believe in any nasty hidden extra charges.

Offers & Promotions

Smart WiFi Thermostat Installation

Smart WiFi Thermostat Installation

We can offer you any type of smart WiFi control on the market, these include Nest, Wiser, Tado and Hive. 

We can install these controls to any type of heating system.

Please contact us for a quote.

Covering the Horsham District.


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Boiler Service Plans

Boiler Service Plans

Service and Maintenance plans available in Horsham, Southwater, Broadbridge Heath and Billingshurst, we offer a range of service and maintenance plans, some that offer a priority 24 hour, 7 days a wee ...

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Landlord Gas Certificates

Landlord Gas Certificates

Ensure that your properties remain compliant and gas safe. Book in a Landlord Gas Safety Certificate with us today.Covering Horsham DistrictCovering Horsham, Southwater, Broadbridge Heath, Holbrook, L ...

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Boiler servicing

Boiler servicing

Book in your annual boiler service, this is a full strip clean service issued with either a landlord or homeowner gas safety certificate, which will be issued by email along with the receipt, You can ...

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Our Location

Suite 32, Standby Business Centre, Foundry Lane
Horsham, West Sussex RH13 5PX

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