It sounds like a vicious cycle. Increased temperatures leading to more airconditioning, leading to more energy use, leading to more carbon emissions, leading to increased temperatures.

This could be the future if we’re not careful, according to new research from UNSW built environment expert Professor Mattheos Santamouris. It finds that increased temperatures, population and economic growth, and a trend of smaller families living in larger homes could see worldwide cooling energy consumption rise by 750 per cent by 2050.

Professor Santamouris will present his research findings, published in the journal Energy and Buildings, at UNSW’s Utzon Lecture on Wednesday night, which will also discuss the global move to zero emissions buildings.

“In 2010, the world’s cooling consumption in the residential sector represented almost 4.4 per cent of the total heating and cooling needs of buildings, but this is expected to increase to 35 per cent of total energy consumption in 2050 and 62 per cent in 2100,” Professor Santamouris said.

“Although the energy efficiency of airconditioners is expected to improve by 20 per cent and the average performance of buildings by 30 per cent, energy improvements can’t counterbalance the tremendous impact of climate change and the increased population on airconditioning demand.”

Current trends in house size only exacerbate the problem, with average space per person in residential buildings expected to grow to 37 square metres, compared with today’s 24 sq m. This is mostly due to an increase in the number of smaller families living in larger households.

Professor Santamouris’ research proposes three strategies to mitigate against residential cooling adding to climate change.

First, the research proposes increasing building standards, so they can reduce thermal loss and protect against ambient heat.

Next is the improvement of mechanical airconditioners and the further investigation of alternative cooling technologies. Solar cooling could be a prime candidate here – powered by the sun’s heat, with hotter temperatures leading to more efficient operation, which would help reduce peak loads.

Commercial solar cooling is already being trialled in Australia, with CSIRO testing a system on Stockland’s Wendouree Shopping Centre in Ballarat.

Finally, Professor Santamouris says it is critical to both decrease greenhouse gas emissions and protect against the urban heat island effect.

“In the future, the focus will need to be on reducing indoor temperatures, providing comfort and protecting the vulnerable population,” he said. “It is evident that significant technological, policy and social initiatives are immediately needed to face the upcoming cooling challenges and protect our future.”

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  1. Except Lyn , not everyone owns the property they reside in. And miss out on your retrofits.
    Article in ABC on Renters and energy saving:

  2. The AC industry is a massive growing climate threat if not addressed properly. In a recent presentation by the Environmental Investigation Agency the following numbers were presented:
    • AC to grow 33 fold by 2100
    • 50m new AC units were bought in 2015 in China (compared to 64m over 15
    years in the US)
    • US uses as much energy for cooling as Africa uses for everything
    • By 2050 more energy will be used for cooling than heating
    • AC accounts for 40% of energy use in Mumbai

  3. Instead of adding even more air conditioning to homes to survive heatwaves we could take a more intelligent approach:

    1) All new homes to be built in a passive solar orientation; with light coloured roofs, eaves that work, sensible window placement to avoid sun strike and enable cross breeze. Flexible shading options. Effective insulation (ceiling, walls, floors, windows). Garages on the south. Seriously; none of this is rocket science.

    2) Retrofit existing homes to make them energy and thermally efficient. You don’t have to hang off an air conditioner in the summer if you home has been retrofitted. We enjoy a cool summer, a warm winter and tiny energy bills (zero carbon of course). Our home is rated 7.8 stars and is 30 years old. Retrofit is not rocket science either. It just needs some careful thought.

    Clear Policy on minimum standards to existing homes would encourage business investment and the creation of jobs.