Has anybody bought one of those radiator fans from Amazon?

[rockpinkpumpkin]

I've seen them advertised and they look useful, would they be a good purchase do you think?
I live in a rented old house, high ceilings, no damp but pretty chilly.

[caroldecker]

Yes, noticed no difference at all in cost or heat

[rockpinkpumpkin]

Ah, so no good then? OK thank you