Wiggins, one thing to make sure that is in the budget is to make sure to have an insulated garage door. Here in Austin Tx. with the weather, temps can get as high as 105*plus and that is not factoring in the humidity and can get below the freezing mark. On days when it is hot, I close the door and open the door to the house and put my fan to pull out cool air from the house. In about 10 minutes the garage is as cool as the house is and do the same in the winter when it is very cold outside. So make this a must, you won't regret it.
