Undersized AC in a 70 sq ft Room? Your Inverter AC Could Be Wasting Energy!

Inverter air conditioners have become many households' best friends for beating the summer heat. But how do you pick the right one? Let's walk through an example to see how it's done!

Mr. Chan, his wife, and their son live in Kowloon City – a family of three looking to replace the AC units in both the living room and their son's bedroom. When choosing an air conditioner, the size of the space is key to working out how much horsepower you need. For a living room of around 110 sq ft, a 1.5 hp unit should do the job nicely. But there are other factors to consider too – like how many people are usually in the room, whether the room faces west and gets direct afternoon sun, and the size of the windows. Take their son's 70 sq ft bedroom as an example, normally a ¾ hp unit would be more than enough, but because the room faces west and has large windows, it gets seriously hot in summer. A 1 hp unit is actually a better fit.

But what if Mr. Chan went with a ¾ hp inverter AC for his son's room instead? What could go wrong?

The room could easily end up not being cool enough and wasting electricity. When the cooling power can't keep up with the actual demand, the inverter AC has to run at a higher output for much longer. It may not even reach the target temperature effectively, and its energy efficiency can drop – meaning it ends up using more power than expected. In other words, it becomes a real energy guzzler.

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