This is the best summary I could come up with:

A study found that waste heat generated by a city’s worth of air conditioners during a heatwave can raise the outside temperature by more than 2 degrees Celsius.

As Europe faces more frequent and more intense heatwaves, you might have considered taking the plunge and buying an air conditioning unit.

It comes from a study published in 2020 that was based on a scenario in which air conditioners are used in all buildings of a city like Paris to maintain an interior temperature of 23 degrees Celsius during a heatwave.

Temperature increases due to air conditioning (AC) use “depend on the time of day and the characteristics of the heatwave, mainly its intensity”, according to the study.

They found that, after “Nine days of a heat wave similar to the one of 2003,” the systematic use of AC during that time would increase air temperature “by up to 2.4°C”.

And as cities are only likely to grow hotter as a result of climate change, that means that citizens are likely to demand more indoor air conditioning.

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