Introducing Coolzy
Air conditioning re-imagined. Cool the person, not the room. Runs on just 340 Watts (normal room air conditioners need 1,200 – 2,400 Watts).
The lowest cost refrigeration cooling solution.

Easy cool air just where you need it.

Coolzy – The small portable air conditioner

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 with a fan that blows cool air at one or more people nearby.

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.

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 is usually between 2.3 and 3: these are highly inefficient machines.

Portable air conditioners with only one pipe seem at first to be simpler and more convenient. However, they perform far worse than other room air conditioners because they suck in cooler air from the room to absorb the heat and pump that air outside. Air has to come in from the outside to make up for the air pumped out, bringing heat and humidity with it. Even worse, the hot exhaust pipe radiates heat back into the room. Therefore, the net cooling effect is about one quarter of a mini-split AC with the same electrical power. Don’t expect more than 3-4 degrees of room cooling.

Unlike other air conditioners, 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, just where we are most sensitive. Therefore, a very small amount of cooling is much more effective at creating the sensation of comfort. Coolzy sends warm air from the back to the ceiling, just like a kitchen refrigerator or freezer. 

Coolzy is as close as we can get to the ideal mini air con, a really small portable air conditioner that provides comfort with very little electricity.

So how does this mini AC compare with the myriad of other cooling solutions now available online?

The traditional mini-split AC is great for cooling a crowd. It cools the whole room by thoroughly mixing the cool air. Most of the energy, of course, cools bricks, concrete, steel and timber. However, everyone in the room will experience air with a similar temperature. The air conditioner also removes excess moisture, through this can lead to dryness, skin, nose, throat and eye irritations after many hours. There are three big disadvantages:

1. A mini-split does not change the air in the room, so air quality decreases as carbon dioxide, volatile organic compounds seeping from furnishings, and body odours all accumulate with time. Opening a door or window provides some fresh air, but significantly increases the power required by the air conditioner for the same cooling.
2. Because it has to be installed in the wall or ceiling, you need a mini-split in every room where you may need cooling. That’s expensive.
3. You need to be prepared for large electric bills. Expect to spend much more on electricity than the purchase and installation cost over the lifetime of the air conditioner.

So, if you can afford it, the best combination is to use a Coolzy mini air conditioner and install a mini-split in your entertainment room to cool your crowd of friends when you need to.