The Small, Compact Portable A/C

We cool people. Not rooms.

A Coolzy is ultra compact making it a great choice for those wanting a small and clever solution that runs on very little electricity.

No water or installation needed, it’s perfect for small rooms. Being ultra low power, it doesn’t try to cool the room, instead focuses cool air on the occupant and ensures they’re feeling fresh and comfortable. It’s not a fan, it’s not a mini-split, it’s somewhere in between. Like a refrigerated fan.


No pipes.
No installation.
No water.

Coolzy is a small portable air conditioner, or personal air conditioner. Inside you will find the same parts as in a traditional room air conditioner. Coolzy is just like a tiny refrigerator (driven by a compressor, with a fan that blows cool air at a person nearby.

How it works

A compressor pushes refrigerant gas into a condenser heat exchanger where a fan blows air through the fins to cool the refrigerant gas so it condenses to a liquid. The liquid, still at high pressure, passes through a thin capillary tube or an expansion valve, reducing the pressure. The low liquid is squirted into a second heat exchanger called the evaporator. Here the liquid evaporates into a cold gas, cooling air flowing past the tubes. The gas, now warmer, passes back to the compressor where it is compressed once again. A Coolzy’s components are super compact meaning it’s nice and small, perfect for small rooms and tight spaces.

Comparing Coolzy to Portable Air Conditioners

Traditional portable air conditioners with two pipes use lots of electricity to pump heat outside, typically 1,200 to 2,400 Watts. Unlike the Peltier coolers, they do pump lots of heat. The CoP (Co-Efficient of Performance) is usually between 2.3 and 3: these are highly inefficient machines.

Coolzy does not mix the cool air with the room air. Instead the cool air is carefully focused at the user’s face and upper body. Coolzy sends warm air from the back to the ceiling, just like a kitchen refrigerator or freezer. Alternatively, we have a Long Tail attachment which will help you pipe the warm air out of the small room. This increases the cooling effect and ensures cool comfort.

Small Water Coolers

Powered by battery or USB cable.

Claim to be “mini air conditioners” but they require water and generally, they don’t provide cooling. Instead they increase humidity and increase discomfort. Online, these are widely regarded as a scam.

A small fan drives air past a wet screen.

A small water tank provides enough for a couple of hours.

In dry air will provide 3 – 5 degrees of apparent cooling if you can place one nearby, 8 – 12 inches away on the desk with the air flow aimed at your face.

Coolzy provides around 20 times more cooling than these devices because a Coolzy uses genuine refrigerated gas driven by a compressor (same as your fridge at home) to create cool air.

Large Water Coolers

Unsightly machines and need lots of water.
The tank has to be refilled every few hours.

Rather noisy because the fan moves a lot of air past the internal wet screen.

These machines will provide cool air for a large room or even several rooms.

Even moderate humidity (>35%) greatly reduces the cooling that these machines deliver. Above 50% relative humidity, only slight cooling will be possible.

Often these machines are used in shopping centres, and only when the ducted air conditioning has broken or malfunctioned. For a home or a small room, these machines are just not a viable option.

Coolzy portable air conditioner measurements

What makes Coolzy unique

  • Instant cooling, no need to wait
  • Smaller, lighter and easy to carry
  • Apparent noise 44 dB – 54 dB
  • Only $43/month electricity cost, other portables cost $150/month or more (12 hours daily use)
  • Concentrated cooling (small amount of warm air will be produced from the rear fan)
  • Australian invention, patented focusing technology

The best mobile air conditioning unit

Technology has advanced and now there are real mobile air con solutions. Coolzy-Pro is a awards winner for the Best Portable Air Conditioner 2022, 2023 and 2024 based on customer reviews. The Coolzy is also the winner of the 2024 Finder Best Portable AC Award and the Australian Governments Eco-Innovation Award 2024.


traditional portable A/C

Portable AC

Traditional AC

Ceiling Fan

Designed for:Personal cooling 7-15°F apparent7-8°F room coolingCooling a crowd 18°F cooling~4°F apparent cooling
Electricity used:340W. ~70c per night1800 W $4 per night400-2400 W $3 - $5 per night50-90 W~15c per night
Installation cost:$0$0$2000$200
Noise level:45-55dBlow, medium, high60dB30-50dB25-65dB
Portable: 33lbs80lbs
Outdoor use:YesYes
Zero Breeze Mk2 Portable Air Conditioner

Mobile Air Conditioner – New AC Technologies

So, what are the new technologies on offer?

A real air conditioner needs a compressor to create cooling (like a Coolzy) and does not rely on evaporating water. The compressor pumps refrigerant gas through tubes in a way that absorbs heat from air on the cooling side and transfers the heat to more air on the warm side. The compressor is the heaviest component.

Cooling even a small room required around 10,000 BTU/hr and that demands a heavy compressor and heat exchangers. Most small portable A/Cs don’t generate enough power to cool a room.

Therefore a mobile air con unit has to do something different.  Cooling the entire room is not an option. Therefore, we need to think in terms of cooling just a smaller space instead, something we call localized cooling.

There are several new mobile air conditioners with light weight compressors weighing about 15 – 20 lbs.

These mobile ACs typically provide 2,000 BTU/hr cooling from 200 Watts of electricity. You need to be right next to them to feel the cooling, and they’re not silent. You need to tolerate significant noise. These machines still need pipes to bring air from the outside for cooling. But they are small, light and easily to move around.

Mobile Air Conditioner – Why Coolzy?

A clever Australian engineer worked out how to focus the cooling instead. He recognized that it’s people who need cooling, not the rest of the space. He invented the Coolzy. Only 22 inches high and weighing 34 lbs, it’s still easy to carry and moves on small wheels. Cool air emerges under the long curved flap and provides effective cooling up to 6 feet away. Coolzy provides up to 4,000 BTU/hr cooling from only 340 Watts power, so it still costs next to nothing for the electricity. Coolzy is quiet as well, easily quiet enough to sleep with, unlike any other the appliances we have discussed here.

One of the best features of Coolzy is the absence of pipes. The machine cleverly directs the small amount of heat produced from the back of the machine to the ceiling where you can’t feel it.  That’s the same as your kitchen fridge and freezer: the warm air rises to the ceiling. There is no need for fiddly installation: just plug it into a nearby power socket.

Coolzy mobile portable air conditioner

The focusing technology enables the use of small, highly efficient refrigeration technology, so the total heat liberated is only 340 Watts, about the same as three people conversing with each other.

So if you’re looking for a truly mobile AC for a small room. or if you want a small as unit to use as a personal AC, you’ll find that the Coolzy is the king of the small air conditioners. It’s the one room AC that other mini air conditioners worship.

When someone asks, What is the Best small room air conditioner? Just say, you need a Coolzy!

Most air conditioners are fixed in place, and need trained technicians to install them. Whether the air con is in the car, caravan, truck cab, or in your home, real mobility is not an option.

The good news is that technology has advanced and now there are real mobile air con solutions.

You might be thinking that a portable is a mobile air conditioning unit.  Here’s a photo of a portable air conditioner. We can see the wheels, so it must be mobile, right?

Actually no, not really.

Especially with air conditioning, looks can be deceptive. Like many advertising images, this photograph does not show the large pipe from the machine to the window. The next photo shows a real bedroom installation with a similar machine.

Now we can see the pipe that these so-called ‘portable’ units need to exhaust hot air to the outside. These machines are large and you need two people to carry them. Then there’s the fiddly window kit to hold the large pipe in place. With many windows, like the one shown, there are still gaps so the hot air from outside (and some from the pipe) gets sucked back into the room.

To get cooling power anywhere near a mini-split, you need a unit with two pipes, one to bring in outside air and the other to exhaust the warm air.

So the so-called portable air conditioner is not portable, and nor is it mobile and easily moved from room to room, let alone home to work or to your favourite retreat. They weigh 50 – 80 lbs, and they’re also noisy. Unless you have a two pipe model, they only provide a few degrees of cooling too. Learn more here

To add to the confusion, if you search for “mobile air conditioner” or even “mobile aircon”, you will be offered sites showing you evaporative air coolers. Here there are very small, light weight, truly mobile units.

However, they actually provide very little cooling. We measure cooling in terms of BTU/hr or kilowatts. A small water cooler will generate 100 – 200 BTU/hr in dry air. In humid air, the cooling will be much less. To cool a whole room, you need at least 10,000 BTU/hr, fifty times more, so don’t expect much from these coolers unless it’s next to your face and the humidity is low.

There are much larger evaporative water coolers, but they’re not really mobile other than having wheels on them.

There are a few small portable A/C’s available these days but they are not all created equal.

A Coolzy uses patented technology so that it can use the smallest components, which use the least electricity. This makes the Coolzy the smallest portable AC and also the quietest. It is by FAR the best solution for a small room portable AC.

Cooling a room means you’re cooling all of the furniture, the walls, the floor and the ceiling. The reason is that as you remove energy (in the form of heat) form the room, the energy from these other areas seeps in. This energy needs to be continuously removed until there is none left and the room is now cool.

To cool a small room, an A/C needs to produce around 10,000 BTU (short for British Thermal Units) of cooling. This is the equivalent of around 1kw of electricity usage. This is the minimum required because there are other factors to consider. For instance, a 1kw portable AC has a large pipe to duct the warm air from the room. This pipe gets hot and radiates heat back into the room, causing the room to heat! It’s effectively fighting itself to create cool air and comfort for the small room.

A Coolzy is the opposite. A Coolzy uses 340w of electricity to generate 4650 BTU. While this won’t cool the whole room, it will generate enough cool air to blow at someone in the room, thus making the person comfortable. The added benefit is that the Coolzy is smaller (smaller components), makes less noise and uses less electricity to get the job done.

Try a Coolzy Today!

Coolzy is a small, lightweight portable air conditioner designed to be used anywhere you need cooling. Coolzy is just like a tiny refrigerator with a fan that blows cool air directly where needed. Get in touch with us if you have any questions about if Coolzy is right for you. Terms and Conditions apply.

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