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Air Conditioner Calculator

Use our handy calculator, which will help you figure out exactly what size of unit you require for your office or home.

What are the room dimensions?

How many people and heat sources are in the room?

What is BTU?

A BTU (British Thermal Unit) is a rating used to determine the heating or in the case of an Air Conditioner the cooling capacity of an appliance.

Typically a minimum of 7000 BTU is needed to cool a small room, whereas commercial units can reach up to 25,000 BTU and beyond. Simply, the greater the BTU, the larger the space that the unit can cool.

Air Conditioner Buying Guide

Wake Up Refreshed.

Stop tossing and turning in the heat. Discover the perfect air conditioner for your home and take control of your comfort today.

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Sticky night ahead? Order before our cutoff for Next-Day Delivery, shipped directly from our network of warehouses and depots across the UK.

Which cooling solution fits your life?

Forget the complicated jargon. Tell us what you need, and we’ll point you straight to the perfect match.

Portable Air Conditioner in a bedroom

"I rent, or I want to move my cooling from room to room."

You need a Portable Air Conditioner. There’s zero permanent installation. Every single unit comes with the exhaust hose included in the box, just plug it in, pop the hose out of a window, and enjoy instant relief. Pair it with a window venting kit to seal the gaps and make setup even easier.

Sleek Wall Mounted Air Conditioner

"I own my home and want a permanent, whisper-quiet solution."

A Wall-Mounted (Split) Air Conditioner is your best bet. They are incredibly sleek, add value to your property, and run so quietly you'll forget they are even on. Want to cool multiple spaces? Look at a multi-split system.

All in one Air Conditioner in an apartment

"I live in a flat, or I just don't want a bulky box outside my house."

Meet the All-in-One Air Conditioner. It installs completely from the inside, venting straight through the wall. You get all the power of a permanent AC without needing outdoor space for a compressor box.

Ceiling Cassette Air Conditioner in an office context

"I have a large open-plan space, or I'm buying for a business or retail shop."

Look at a Ceiling Cassette Air Conditioner. They sit flush inside a suspended ceiling, blowing cool air in four separate directions. They are completely out of the way, making them the ultimate invisible solution for commercial settings or large rooms.

Features that actually make your life easier

Modern air conditioners do much more than just blow cold air. Find the features that solve your daily headaches.

"Won't a standard fan do the exact same job?"

The Reality: No. Fans just move the existing hot air around the room, they don't actually change the temperature. An air conditioner uses a professional refrigeration system to pull heat out of the air, drop the temperature by degrees, and physically freeze the room.

"I don't want to drill massive holes into my walls."

Zero Damage Solutions: Stick with a Portable AC. They use a temporary, lightweight window layout that pops into place when it's hot and packs away when it's not. There is zero drilling, zero screws, and zero permanent wall damage, making them safe for renters and listed builds.

"I want to turn it on before I get home from work."

Smart App Control: Turn your AC on from your phone while on the commute. Walk through your front door into a perfectly chilled home. Shop Smart ACs.

"The noise and cold keep waking me up."

Uninterrupted Sleep Mode: Enjoy a cool bedroom without loud fans or bright displays. It gently scales down overnight so you and the kids can sleep peacefully through muggy nights.

"I don't want to pack it away in Winter."

Year-Round Heating: Many AC units include a built-in heating mode, which is often much more energy-efficient and cheaper to run than turning on your central heating.

"I struggle with damp and drying laundry indoors."

Built-in Dehumidifier: The dehumidifier setting pulls excess moisture out of the air, protecting your home from mold and dramatically speeding up laundry drying time.

"I'm worried about my electricity bill."

Energy Efficiency: Look for air conditioners with an A or A+ energy rating. They provide maximum cooling while using minimal electricity. To see exactly how much it will cost to run based on your room size, try our calculator below.

"I hate when cold air blasts directly on me."

Oscillating Louvres: Instead of blasting air in one direction, oscillating vents sweep cool air evenly across the entire space, cooling the room much faster without creating uncomfortable drafts.

"I don't want something I have to constantly empty."

No-Fuss Drainage: Fixed Wall-Mounted and All-in-One systems drain moisture automatically to the outside world, you'll never touch them. For Portable ACs, choose a model with Auto-Evaporate technology. It recycles moisture to cool the internal machinery and vents it out the window hose as vapor, keeping maintenance near zero.

"Do I have to top up the gas or buy extra chemicals?"

Factory Sealed: No maintenance needed. Air conditioners are completely sealed, closed-loop systems pre-charged with refrigerant at the factory, just like your home fridge. Unless the unit gets rare internal structural damage, the gas lasts for the entire lifespan of the machine. Just plug it in and cool down.

Find your perfect match in seconds.

AC power is measured in "BTUs" (British Thermal Units). Buy one too small, and you'll still be sweating. Buy one too big, and you're wasting money.

Just tell us a little bit about your room, and we'll do the math for you.

Already know your size?

Sam Carter

Sam Carter

E-commerce Product Trader & Product Expert (HVAC)

Sam runs the digital journey for our air treatment and cooling categories. He specializes in cutting through heavy technical data from radiator outputs to extraction rates to give UK households straightforward, practical advice so they can buy with confidence.

Shop Sam's Expert Categories: Radiators Dehumidifiers Air Conditioners

Need professional installation?

Going for a sleek Wall-Mounted or Ceiling Cassette unit? We have over 20 years of experience. Click here to learn more or call us on 0330 041 2742. It cheaper than you might think.

Frequently Asked Questions

Not sure if an air conditioner is right for you?

We keep an extensive range of commercial systems, consumer units, portable air coolers, and heavy-duty fans to meet every single layout, lifestyle, and budget. If you are struggling to find your setup or just want a second opinion, hit our live chat button, our UK based sales and service experts are on hand to help.

Ready to reclaim your comfort?

Don't wait for the next heatwave. Secure your cool, calm oasis today.

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Our Largest Ever Range of Portable Air Conditioners

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From sleek compact designs for smaller bedrooms to high capacity smart systems for open spaces, explore premium cooling engineered for every single budget and lifestyle requirement.

Slimline Series

Budget-friendly, ultra-compact cooling that fits smaller bedrooms, home offices, and tight spaces perfectly.

COMPACT

P Series

Our popular high performance setup offering smart controls and robust cooling capacity for busier family living areas.

SMART HEAT

Eco Series

Premium energy efficiency, exceptionally low noise levels, and intelligent climate profiles for comprehensive comfort.

SMART QUIET HEAT LOW ENERGY

Heavy Duty Series

Rugged, high output configurations engineered to protect large commercial environments, servers, and business spaces.

SMART HEAT METAL CASE
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