I was led to believe that artisanal toast bars were popping up all over the place in the US right now.  I'm pretty sure eating toast 24/7 is a thing and bitcoin must be in those same places - I'm thinking San Fran?
 

If your Asics are running at that temperature, your cooling is shit and you will not only burn your toast, but the Asics too. I would much rather channel all that heat into central heating. Let's take the Shopping Malls for instance. How much are they spending on heating solutions? Would it not be better to rent basement space to Bitcoin miners and then channel the heat into the building?

In Summer the heat can be re-directed with fans to the outside of the building and on cold days to the interior. How many Shopping Malls use huge Air conditioning systems to generate heat? They swap unused space for free heat.

Rent space to bitcoin miners? Sure, if there's absolutely nothing of value to steal in your mall & don't mind getting stiffed on rent.
You do realize that shopping malls don't have big empty basements, and that retail space is a bit pricier than tin chicken sheds in rural Chian, right?
And that few shopping malls have electricity rates anywhere close to Chinese, government-subsidized rates?
And what of the summer months? Bitcoin farmers are seasonal renters?

Otherwise, best idea ever.