A+++ heatingWi-Fi
In stock5-year compressor warranty
5 years on the compressor, 3 on the indoor unit — registered automatically.
Ready for your installer
Full documentation pack, energy label and manuals with every unit.
The full Williams range
Nine A+++ inverter series, with the best sellers held here in the UK.
R32 refrigerant throughout
Lower GWP, and compliant beyond 2030.
Best sellers
What Britain is actually buying
Ranked by units shipped this season. Every one is in stock today.
The range
Three ways to condition a building
Everything we sell runs on inverter technology and R32. The difference is where the box goes.
Heat pumps
We supply the heating too, not just the cooling
Williams air source heat pumps, the same range our Spanish arm has been fitting for years. Air conditioning cools a room. A heat pump takes the boiler out of the equation.
Monobloc and bibloc
Everything sealed outdoors, or a small indoor unit that keeps the water inside. We say which one suits the property.
It replaces the boiler
A split heats one room. A heat pump heats your radiators, your underfloor and your hot water.
Get your installer first
The Boiler Upgrade Scheme grant is claimed by an MCS certified installer, not by you. Buy the kit first and you can lose it.
Sizing
Get the capacity right first
An undersized unit runs flat out and never quite gets there. An oversized one short-cycles, wastes money and leaves the room clammy. Two minutes here saves both.
80 ft²1,400 ft²
6.5 ft12 ft
Room type
Estimated load
8,800 BTU/h
Choose a unit rated
9,000 BTU
≈ 2.6 kW
A guide only. Awkward rooms, poor insulation and open-plan layouts change the answer — send us a photo and we will size it properly, free.
Who we are
New in Britain, 25 years in the trade
Reliable Williams Aircon Ltd brings the Williams range to the United Kingdom. The company is new here; the group behind it has supplied and fitted air conditioning in Spain for over 25 years.
That group keeps the full catalogue in stock across its Spanish and Bulgarian bases — around a thousand units — so availability is a real answer rather than a guess, warranty parts included.
We supply homeowners, installers and trade. Tell us the room and we'll tell you honestly which unit it needs — the sizing matters more than the badge.
Journal
Advice worth reading before you buy
Get in touch
Tell us the room, we'll tell you the unit
No online checkout, no pressure — just send the details and we come back with the right Williams model and a price. Or call and speak to someone who has actually fitted one.
Request a price
Tell us the room and roughly its size and we'll come back with the right unit and a price. Photos always help.
Prefer to browse first? See the full range