I bought one of these heated cat houses on Amazon for my stray/ferals and they aren't using it I've had it outside for a few weeks and so far not much interest. I've tried putting treats inside, putting food inside (they go inside and eat the food/treats and then leave) spraying it with catnip, and finally I moved it near the beds they sleep in and they still aren't using it. Anything else I can do to encourage them? It's not that cold here for the most part, but it's going to be in he 30s for the next few weeks at night and I know they'd be warmer sleeping on that heated pad.