The garage is usually the largest uninsulated section of your house, and insulating it can lead to large long-term savings on your energy bill, especially if garage is used as a workspace or if there's a room directly over the garage. Saving cash is the most obvious benefit, but certainly not the sole one. Keeping the garage cooler during the summer time and warmer in the winter is likely to make working in the garage a far more pleasant activity, and also make getting into to your car significantly less painful. Insulation willl also reduce street noise when you are inside a loud area.
Insulating a garage door is easily done by getting a a ready-made insulation kit. These kits will contain all you need to install the insulation yourself, if however you don't feel up to the task, you can hire a professional. Insulation kits typically fall in the price range of 80 and 200 dollars, determined by whether or not you have One or two doors that require insulation. There are some major types of kits to think about:
Foil (Single or double layered)
Expanded Polystyrene (EPS)
Before considering these types of insulation, it is essential to be aware of the reasoning behind the R-value. The R-value of a material is a way of measuring how much it stops heat transfer. For insulation purposes, the greater the R-value of a material, the more insulating it is.
Fiberglass kits usually boast the greatest R-value ratings. Owens Cornering is one of the most popular fiberglass insulation manufacturer, and their garage door insulation kit has an R-value of 8, and is considered easy to install. However, this kit is designed for 8 panel garage doors. 10 panel doors are rather common, and so you may have to leave some panels uncovered, or buy a supplementary kit merely to cover the remaining panels. Some users may also consider the fiberglass aesthetically unappealing.
You will find more information on the Owens Cornering website, such as an installation video, and professional installation services.
Reflective foil kits come in both single and double layered varieties. It is composed of layers of polyethylene bubbles surrounded by sheets of aluminum. The single layer providing an R-value of around 4.6, and the double layer an R-value close to 6. Foil insulation is suitable for garages without sections built in to the door, as it covers your entire door. It is easy to install and possesses a relatively good R-value rating, however some may find the reflective surface unattractive.
EPS kits contain panels made from Expanded Polystyrene, covered with High Impact Polystyrene (HIPS). Though they've got an R-Value close to 4.5, many find them much more sleek to look at than fiberglass or foil. The laminated surface also ensures they are both durable and easy to clean. Some popular EPS kits are sold by FoamPanel and Matador. Matador kits can be purchased from their official website, and FoamPanel kits, like most kits mentioned on this site, can be purchased from Texas Garages.
Places to buy:
Garage door insulation kits ought to be available at most home local home maintenance stores including Lowes, Home Depot, Ace Hardware, etc. The majority of stores have an online presence as well.
Some things to remember
If you have multiple garage doors, you'll generally want to purchase one kit per door.
While these kits should not add enough wait to the doors to result in any problems, if your springs are worn out, you might need to replace or repair them.
Wear gloves when working with fiberglass. Touching fiberglass with bare skin and end in itchy skin and inflammation.
More information on garage door insulation kits can be found at: http://www.garagedoorinsulationguide.com