Learn About Portable Air Conditioners

There are two types of portable air conditioners:

1. Coolzy – provides micro-climate around people who need cooling

2. Old-style portable air conditioners that claim to cool the whole room, with a large exhaust hose attached to a window. Unfortunately they suck out more air than they cool. They replace it with hot & humid outside air.  Nearly all of the electricity is wasted, and there is only slight room cooling.

Compare Coolzy with Old-Syle Portables
Half the size and weight

Coolzy: 55 cm high x 29 cm x 39 cm, 17.5 kg, easy to carry.

Old Style Portable: typically 80 cm high x 40 cm x 45 cm, 32 kg, hard to move.

Best for bedrooms

In moderately hot weather, Coolzy can be used on its own (as shown) or with a normal mosquito net. We recommend the optional Igloo bed tent in really hot conditions with indoor temperatures consistently over 28°C at night. The tent amplifies cooling over the bed and can also reduce energy consumption by about 30-40% which is ideal for battery and off-grid applications.

Old style portables are unsuitable for bedrooms. They are much noisier and have relatively low cooling performance compared with a split AC using the same power. Also humidity builds up in room with time.

No exhaust hose or window kit

Coolzy: use it anywhere because there is no exhaust hose

Old-style Portable: has to be close to a window to attach the large exhaust hose with the window kit

Lowest total cost

Coolzy: With a monthly running cost only about Rs 2,500 you will soon save the entire purchase cost

Old-style Portable: Monthly running cost at least Rs 10,000 (12 hours a day)

At least 75% less electricity, C02 emissions

Coolzy: 800 – 1,100 Watts cooling, 300 Watts electricity (same as a few iridescent light bulbs), 0.25 tonnes CO2 over three years, equivalent to 110 litres of petrol

Old-style Portable: 3,000 – 7,500 Watts cooling, 1,000 – 2,400 Watts electricity, 1 – 2 tonnes CO2 over three years, equivalent to 450 – 900 litres of petrol.

Focused Cooling

Coolzy: all cooling directed around people using it

Old-style Portable: mixes air in room, sucks out more air than it cools and sucks in hot air from the roof space outside. Very little room cooling.

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Much quieter

Coolzy: 47 – 54 dB – quiet, like an electric fan

Old-style Portable: 55 – 63 dB – noisy, can be hard to hear people speak

Fresh Air

Coolzy: Open

Old-style Portable: Closed

Easy to move. Use anywhere.

Coolzy has eliminated the exhaust hose: such a wonderful improvement. It is on caster wheels and can easily be moved where you want to use it. At 17 Kg it is easily carried too. Take it anywhere you need cooling, even outside in sheltered places.

The old-style portable comes with a hose and window kit which is fiddly to install, and only works with some windows. That means you cannot easily move it once you have installed it. Plus the exhaust hose is ugly, helps to heat the room, and makes lots of noise.

If Coolzy has no exhaust hose, surely it must warm the room?

Answer: Coolzy releases only 300 Watts, similar to three people in the room. Coolzy directs its warm air exhaust to the ceiling where the heat is absorbed, just like the warmth from your fridge which you don’t notice (warm air rises naturally). Any excess finds its way out of open windows or doors.

In a humid climate like Singapore, the warmth is actually useful because it makes the relative humidity slightly lower and reduces the tendency for mould to grow on walls and other surfaces.

What size room can the Coolzy cool?

Coolzy works in any room, even outside in sheltered places. It creates a micro-climate, a cool zone, up to 4-5 square metres.

When should I consider the optional bed tent?

If the temperature inside your bedroom regularly exceeds 28°C at night, the Igloo bed tent provides extra cooling to keep you comfortable, and also provides chemical-free mosquito protection.

We always recommend the Igloo tent for sleeping with Coolzy in Pakistan.

The Igloo bed tent can also reduce the air conditioner power consumption to about 220 Watts average in the monsoon season, a valuable saving.

The Igloo bed tent also provides an ideal place to work from home, or for your baby or small child to be cool and comfortable during the day time.

How far away can Coolzy be effective?

We recommend keeping Coolzy near you, no more than 2 metres away. with Coolzy-Go, we recommend our Focus Enhancer accessory which extends the range and optionally directs the cool air flow at a higher angle.

Is there still a reason for using a split AC?

If you need to cool a crowded room for 2 – 3 hours, a split AC is effective. Split ACs provide no fresh air exchange and the doors and windows need to be closed to retain the cool air so carbon dioxide, volatile organic compounds and body odours build up with time.  Prolonged use of split ACs for sleeping can cause dry itchy eyes and skin irritation from dry air and the running cost can be very high.  Expect to pay Rs 80,000 or more and at least Rs 12,000 a month for electricity if you use it for sleeping and sometimes during the day.


Tell me about other low cost, energy-efficient ways to keep cool at home or work.

Ceiling fans can be effective in moderate heat.

An electric fan on a table next to a window can draw outside air through the open window and blow it across a bed to provide effective cooling for sleeping. Make sure that there is one other open window or doorway tor air to escape.

Fans provide about 2 degrees of apparent cooling. (Coolzy provides up to 10 degrees of apparent cooling, sometimes more).

Evaporative coolers (using water) cost much less than an air conditioner to run and provide cooling in the dry summer heat. Unfortunately they are noisy and relatively ineffective in the monsoon season because the relative humidity is very high, around 75% – 80%. You can use Coolzy with your evaporative cooler.


Who invented Coolzy and where?

Coolzy is an Australian and Singapore based start-up company founded in 2007. Inventor James Trevelyan created the concept after experiencing summer heat in Pakistan with intermittent electricity for air conditioning.  He refined the concept with a series of prototypes, assisted by our manufacturers in Taiwan.  Our first commercial models went on sale in India and Pakistan in 2016.