My work one was replacing a 2016 Macbook Pro which struggled to last more than a couple of hours when I was doing dev work, all whilst trying to reach orbit with its fans. I've never heard the fans kick in on the new one.
As for the Air, I thought I'd be crippling myself a bit by only going fot the basic 8GB RAM model, and other than when I installed a copy of Premier Pro and tried rendering something it's been amazing - even then it rendered fine, just took a fair bit more time than on a pro.
I'm not sure I could go back to an overheating, crappy Intel "Mobile" based laptop - they shouldn't even be allowed to call those things mobile chips at this point, they're utterly shite.