I'm a bit of a fairweather climber and like some creature comforts.
Does it get cold and minging outside often? If so, you already have the answer above.
I doubt you'll relish using it without any heat source.
My thoughts.Will the floor be dry, or just the board? A wet/icy landing would put you off training.Where will you warm up? Pulling straight on a campus board is just asking for an injury.Do you have any motivated friends? Training on your own is rubbish, and as Moo says, may lead to you telling porky pies about your accomplishments and losing your sponsorship deal.
How much do you campus indoors? How's your motivation?
Nice touch Pete! Aren't these Satan's spawn when it comes to the environment though? If I was to go down a heat source route I could look at those infra red bar lamps - I think they might be a bit more reasonable in terms of space, energy consumption and efficiency?