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About     No Air Con Night

A prairie fire can be ignited by a single spark. It is never too late to ease global warming and its environmental impacts!

“No Air Con Night” is a territory-wide energy saving campaign started in 2010 to promote the wise use of air conditioning. Green Sense aims to bring out the importance in reducing greenhouse gases and saving energy through this event. By turning off the air conditioning for one night, we hope the citizens to  rethink how their habits rapidly affect our natural environment, and take action to slow down global warming.

With the average global temperature rising every year, the use of air conditioning has been intensifying in recent years. In 2019, Hong Kong consumed 4.57 billion kWh of electricity [1], of which air conditioning made up around 28% (1.24 billion kWh of electricity) of the total [2]. Once the carbon dioxide (CO2) concentration increases in the atmosphere, it acts like a thicker glass roof of a greenhouse trapping the heat in the atmosphere, which accumulates the temperature of the Earth. If we are more relying on air conditioning when the weather gets hotter, forming a vicious positive feedback in heating up the planet. Therefore, reducing the usage of air conditioner as well as diminishing carbon emission would be a better way to cool down the temperature!

With continuous promotion and educational activities, “No Air Con Night” gained generous support from citizens, the business community, education institutes and political parties. With reference to the pledge collected last year, over 90,000 households joined and turned off the air con at home and hostels. In this year, we aim at 120,000 households joining which can reduce 440 tonnes carbon emission.

We sincerely invite all citizens in Hong Kong to turn off the air con when the outdoor temperature is lower than 27°C. Make a small step to ease global warming!


Census and Statistics Department. (2021). The Hong Kong Energy Statistics 2021 Annual Report.

2. 機電工程署(2021)。《香港能源最終用途數據 2021》。

Electrical and Mechanical Services Department. (2021). Hong Kong Energy-End Use Data 2021.

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