Meteorologists are in agreement: summer 2026 is forecast to break all previous records. But for millions of UK renters, home office workers, and older adults, the approaching heatwave represents an extreme challenge.

Because electricity bills are already sky-high and climbing relentlessly. Anyone who tries to cool their home with a conventional air conditioning unit now faces a serious financial strain — quite apart from the fact that most landlords refuse installation out of hand.

The problem with traditional air conditioning:

Extreme purchase and installation costs: Consumers can typically expect to spend several thousand pounds on the unit and fitting combined. And that's before even knowing whether the landlord will grant permission in the first place.

The landlord dead end: Around a third of UK households rent privately. Under most standard tenancy agreements, any structural modification to the property without explicit written consent is prohibited — and permission for cooling units is almost never granted. On top of that, the exhaust hose of a portable AC unit simply cannot be sealed properly around a typical sash window, meaning hot air streams straight back in anyway.

The electricity trap: A standard portable air conditioning unit draws up to 2,000 watts from the mains. At current UK electricity rates of around 24p per kilowatt-hour, a single overnight cooling session costs nearly £4. Over a two-week heatwave, that adds up to £50–£100 in additional electricity costs — just for a little cool air.

In short: a luxury that fewer and fewer people can afford or want.

The turning point: an industry insider speaks out

This is exactly the problem one former engineer set out to solve. He spent years in the development department of one of the UK's largest domestic appliance manufacturers, watching day after day as cooling was made unnecessarily expensive and complicated for the end consumer.

His goal was crystal clear: to create an affordable solution for everyone. A device that delivers genuinely cool air, requires absolutely no installation, needs no exhaust hose, and uses barely any electricity.

After several years of development, he has done it.

That device is the Coldeez Cooling Ace.

The story behind the innovation

The Coldeez Cooling Ace is the creation of British engineer James Hartley. When his father's small cooling technology company ran into financial difficulties, James left his secure corporate position to help. In the middle of their shared development work, his father passed away suddenly and unexpectedly. James carried on alone — and succeeded: he saved the family business and secured every job.

Today the Coldeez Cooling Ace is selling faster than it can be manufactured. Despite the extraordinary demand, James refuses to resort to cheap mass production:

A look inside the Coldeez Cooling Ace reveals exactly why this invention is turning the market on its head.

The secret behind the icy freshness: what makes the Coldeez Cooling Ace so unique?

Conventional portable air conditioners work with heavy, noisy compressors and chemical refrigerants. They consume vast amounts of electricity to force the air temperature down by brute force. James Hartley has turned this outdated principle completely on its head.

The Coldeez Cooling Ace uses an advanced CoolFlow evaporative cooling system. The compact device draws in the warm, oppressive room air and passes it through a specially developed, water-saturated cooling pad. In doing so, it harnesses a centuries-old law of physics: when water evaporates, it extracts thermal energy from the air at a molecular level — the same mechanism that cools sweat-drenched skin, makes a damp flannel feel cold on your forehead, and has kept clay water pots cooler than the surrounding air for thousands of years. The result is a crystal-clear, pleasantly fresh and noticeably cooler airflow — entirely without a compressor, refrigerant, or exhaust hose.

The result is a clean technology that is absolutely unique on the market in three decisive respects:

Over 99% less electricity consumption: While a conventional portable air conditioner draws up to 2,000 watts from the mains, the Coldeez Cooling Ace runs via USB on just around 15 watts — less than a smartphone charging pad. Cooling therefore costs you no more than a few pence per day. At current UK electricity rates of around 24p per kilowatt-hour, a saving that becomes clearly visible on your electricity bill after just a few days of heatwave.

0% installation effort (no exhaust hose): Conventional portable air conditioners need a hose fed out of the window — something that simply cannot be sealed properly around a typical sash window. Not to mention that most tenancy agreements prohibit any such modification anyway. Since the Coldeez Cooling Ace works without a compressor or refrigerant, it needs no exhaust hose whatsoever. Simply charge via USB, switch on, and that's it. You can move the device freely from room to room — and your landlord never needs to know it exists.

Pleasantly natural air quality: Standard air conditioning units dry the air extremely, which frequently leads to sore throats, dry eyes, and colds. The CoolFlow evaporative technology in the Coldeez Cooling Ace instead adds a natural, fresh moisture to the air — like a breeze off the sea. The result is a pleasantly refreshing air quality that is particularly gentle on the airways and does not irritate sensitive users.

What customers say about the Coldeez Cooling Ace:

Frequently asked questions:

Do I need to do any complicated installation? No, none at all. No tradesperson, no tools, no wall drilling, no exhaust hose, and no permission from your landlord required. Simply place the device where you want it, charge it via USB, and switch it on — done. Not a single conversation with your letting agency needed.

Does the water need constant refilling? No. Refilling at the tap takes less than 30 seconds. A single fill typically lasts a whole night or a full working day in the home office — precisely when you need the cooling most.

Is it too noisy for the bedroom? No. Unlike the drone of compressor air conditioners and vibrating tower fans, the Coldeez Cooling Ace was engineered from the outset for whisper-quiet operation. It won't disturb you whether you're working or sleeping — not even in a period property with thin walls.

Exactly where does it cool? The Coldeez Cooling Ace cools your personal space directly around you — your bedside table, desk, armchair, or sofa — with high efficiency. Simply place it wherever you are sitting or sleeping. The device follows you from room to room: bedroom at night, home office during the day, garden or balcony in the evening.

Where can you buy the Coldeez Cooling Ace?

So that everyone can afford the Coldeez Cooling Ace, it is sold exclusively through the official online shop. James Hartley deliberately bypasses wholesalers and large retail chains, which would otherwise push the price up.