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Or even fixed-on-a-pole rotors.

The fans they were likely talking about are probably the horizontal-style fans you see in orchards for (mainly) frost prevention (they look like small windmills).

But why not very large rotor fans - maybe mounted HVLS fans, perhaps a bit larger, and maybe spinning a bit faster. Surely something like those would be cheaper to install and run 24/7 - assuming they worked as well?

Then you would need access roads throughout the orchards so your land use would be less efficient. Same as with tree farms and why they transport them with helicopters, too:

https://www.youtube.com/watch?v=cK3fV6EbTOo

I'm thinking: a fan the size of the ones they have on air boats - the flat-bottom boats with the giant powerful fan on the back? That kind.