BBC News By Chris Vallance Does your home become unbearable in hot weather? Increasingly a hot home is an overheating office too. During the pandemic, up to 30% of people in the UK were working from home compared with 5% in 2019. But it's hard to work if you live somewhere that becomes an oven in hot weather. A recent government report into climate risks warned that unless homes can be kept cool in summer and warm in winter, health and productivity will suffer. image copyrightGetty Images image captionA development of new homes incorporating Passivhaus principles According to some forecasts, air conditioning alone could contribute to as much as a 0.5C increase in global warming by 2100.