"The IEA indicates average indoor temperatures in the EU are now about 22° C" Wow, current room temperature here is around 16 degrees Celsius, perfectly fine as long as you don't wear a t-shirt. Still comfortable too. I guess it all depends on what you're used to. As an added benefit, a lower room temperature induces a higher metabolic rate [0] , which could help fight our obesity problem (okay, that might be stretching it a bit)