My FBO has the same policy though they don't charge for the plugin. They
say
they have the policy because of the risk of fire. I find an hour or a
little
more makes the engine feel warn to the touch. I have Tanis heaters.

Are we talking about HANGARED planes here? Or tied down?

I can perhaps understand not allowing "permanent plug-ins" for tied down
planes -- after all, the cords all over the ramp are a "trip hazard", if
nothing else.

But if they are telling you that you can't leave your plane plugged in
inside your own hangar, I'd tell them to get screwed.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"