You should make sure that if you have a garage, that you insulate the doors. There are very many benefits that come with an insulated garage door that you need to enjoy. One of the main advantages of insulating your garage door is that it will prevent cold from coming into your garage just in case you have a door to the interior of the house or you have a room above the garage. Not having insulations between the panels of the door could cause cold to enter inside the door making a great heat loss in the garage even if your door is sealed well against the elements.
If you have any kind of shop inside your garage because of being a hobbyist or you need to work on your car, you need to have a heater inside the garage, on the days when it is extremely cold, will be reduced if you have an insulated garage door. It can be almost as chilly in the garage as the outside sometimes, even if you have closed the doors because of you not insulating the garage doors.
Even if you check and see some Styrofoam granules inside our door, you should not be convinced that it is good insulation. The only thing that the Styrofoam granules will be able to do is dampen the sound and nothing more.
Be extremely sure that you have insulated the garage door well by checking the seals at the top and the bottom of the door and also in between the door panels. Normally, they should be flexible and nice and so if they are somehow brittle, hard and starting to crumble make sure to replace them. You have a few things that you could do when insulating a garage door. There is the option of hiring a professional to insulate the garage doors for you and there is also the option of you doing it yourself if you actually know how to by buying some DIY tools and getting right to it.
You will now come to understand why you have been having such a high heating bill if you have a room above your garage or you have an attached garage. The same cold you would feel if you left a window open throughout during a cold season is the same cold you would feel if your garage doors are not insulated at all. For the sake of enjoying low heating bills and your garage space, your garage doors should be insulated.