A thought which occurs to me: while others have been mentioning how they've heated/cooled a garage or other room, Mike is talking about trying to do this with a car port, which is, from its nature and from its description, open to the air and environment on most sides. Maybe, Mike, it might be advisable in the long run to consider actually taking down that car port and constructing a real garage, an actual enclosed area, instead? At that time you could also build in what you want for heating/cooling..... ??? Yes, it would probably be more expensive but in the long run worth it? Just a thought here......