I wasn't sure where this would go, as there isn't any other place that was as close as this one, but here I go...

So recently I read an article about this guy who built a greenhouse that was heated geothermally. This is him.

I was wondering if that would be viable in aquaponics, especially here in Canada. The air would be heated by pipes running air underground, and the fish tanks could be heated by circulating water.

I was wondering, what's everybody's take on this?

Fixed the link, you just forgot the .com, that's all Jackalope