The commercial is about Apple's new naturally ventilated building called "Apple Park". It says "We run chilled water tubing through that concrete mass, and then we use outside air to be our dominant cooling system, and you're using very little energy to get the tempered water to do this. So it's a breathing building."
I've searched on the internet for the meaning of "tempered water" and some of them say "tempered water" means "Water in the temperature range from 85°F (29°C) to 110°F (43°C)". So it's like mild hot water. Then why can it help cool the air?