An air conditioner’s role is to ensure the temperature in your home is perfect all year round. But what exactly is the ideal temperature? And what should you be setting your thermostat to ensure maximum comfort without breaking the bank?

Of course, the ideal temperature is entirely subjective. Everyone has their preferences; all homes are different, and certain circumstances may influence how warm or cool you need a room, so what you set your thermostat to will depend entirely on you.

What is the ideal indoor temperature? That’s a tricky one. There are a few factors that will influence this, but there is an answer. Let’s take a look.

In medical terms, the ideal indoor temperature is somewhere between 15 and 25 degrees celsius. This is a fairly big range – 10 degrees. Where you choose to set your thermostat in this range will depend on a few factors:

Factors To Consider

Size Of Home

From its layout to orientation, the size of your home may affect how you set your temperature. For example, your house may be particularly drafty when there is a breeze or the room you are heating/cool may get a lot of sunlight in the morning, but not in the afternoon. Depending on the type of system you have, you may want to set different temperatures in different rooms to mitigate these discrepancies, or you may want to change your thermostat at different points during the day.

Personal Circumstances

Personal circumstances may affect how warm or cool you need your home. For example, you may have a newborn and need to keep your house warmer than you would find comfortable. Or you may be looking after an elderly parent or relative and need to keep the house quite cool in summer.


Humidity can significantly affect how you feel the heat or cold. In winter, the air is typically much drier, which makes your skin feel colder. Whereas in summer, the humidity can make you feel sweaty and uncomfortable, encouraging you to crank up the AC.


Your weight (and the weight) of your family may also impact how you feel indoors. Those with a higher BMI will feel warm easier, while those with a lower BMI usually get cold easier.


Your age will also have an impact. As we get older, we tend to feel the cold more so than younger people. Anyone over the age of 55 may feel more inclined to turn up the air con in winter.

So, What Should I Set My Thermostat To?

Well, the World Health Organisation (WHO) recommends that you keep your thermostat between 21 and 18 degrees at home if you’re healthy, don’t have any young children, or are not elderly and are appropriately dressed. This means wearing a jumper, pants and socks indoors. Anything below 16 degrees or above 24 degrees is not considered ideal.

We should also note that turning your air conditioning down (colder) in summer and up (hotter) in winter doesn’t cool or heat the space any quicker; the conditioned air temperature is always constant. This means that the system will only run for longer, costing you more in electricity.

About Us

If you are thinking of installing an air conditioner in your home or requiring maintenance or servicing for an existing unit, please don’t hesitate to contact us today.

We are based in Sydney. However, our operations span the greater metro area, including the Eastern Suburbs, Lower North Shore and South West. With over 9 years of experience under our belt, we pride ourselves on providing commercial air conditioning services of the highest quality.

Want to know some more about air conditioners? Check out these posts below:

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The best type of air conditioner for apartments, single-story or multi-story

Improve the air quality in your home with these 6 easy steps