According to this [1] it looks like about a third of energy used in commercial and residential buildings is for space heating. That only accounts for some 32 Pw

According to this [1] it looks like about a third of energy used in commercial and residential buildings is for space heating. That only accounts for some 32 Pwh of 157Pwh [2] of energy use but is greater than the 21-23Pwh of total electricity generation. So judging by your figure of 10% of electricity usage that's 2Pwh (10% of 21-23Pwh) for air con v 10Pwh (third of 32Pwh) for space heating. But that energy demand is mostly based on combusting fossil fuels directly, decarbonisation would require a move to electric heating which would probably involve heatpumps, and quite a lot of insulation, so I would hope that that figure would drop quite alot in the future. [1] https://www.sciencedirect.com/science/article/pii/S1364032114007151 https://www.sciencedirect.com/science/article/pii/S136403211... fig 3. [2] https://en.m.wikipedia.org/wiki/World_energy_consumption https://en.m.wikipedia.org/wiki/World_energy_consumption