Best Garage Door Insulation for Hot Climates – Buyer’s Guide

garage door insulation kit A garage provides space for homeowners to undertake various woodwork projects, work on your car, or simply workout. However, when the sun is up in the sky in summer or the snow is falling in winter, the temperatures may be too high or too low, thus making it difficult to work efficiently.

As such, you need to get a garage door insulation kit to ensure the radiant heat is reflected rather than transferred and allowed to flow. This will allow to cool the space when it’s hot and warm it when it’s cold. This will end up creating a super comfortable environment that is conducive for any kind of work.

Checkout our list of the 5 best garage door insulation kits for hot climates in the market. Our selection criteria included the user reviews, ratings, unique features, performance, what is included in the kit, and the dimensions.

TOP 5 Best Garage Door Insulation for Hot Climates in Oct, 2019

Product Materials Size, in R-value Type
(Editor’s Choice)
Foam Core,
4 Rolls of 18ft x 24 8 Pre-Cut Panels Check Price
Owens Corning 500824 Fiberglass,
12 x 16 x 24 8 Panels Check Price
Matador Polystyrene 2 x 54 x 1.2 4.8 Panels Check Price
Reflectix BP24050 Polyethylene,
aluminum foil
14 x 14 x 24 no Roll Check Price
Reach Barrier 3009 Polyethylene 25 x 13.4 x 13.2 no Pre-Cut Panels Check Price

US Energy NASATECH (Pre-Cut for 16 Panel) – Editor’s Choice

To begin with, this insulation kit has 8 panels that are 1/4-inch thick. It is made from the newly improved super heavy-duty double-sided foam tape that is highly adhesive for efficient holding. It can be effectively used to insulate garage doors that are up to 18 feet tall.

This product is the upgraded version of 5/16 foam core. It will fit a two-car garage door perfectly and will insulate your garage by creating an air pocket that is able to achieve the R-value of 8.

You do not need any special know-how or tools to install this insulation kit. You, therefore, can install it quickly during winter or summer to cut down on the heating and cooling costs respectively.

This insulation kit is 5/16-inch thick, making it the thickest reflective foam core insulation currently available in the market.

It has no fiberglass, carcinogenic, or toxic compounds so it is clean for use.


  • Lightweight and durable
  • It has a clean finish
  • Eco-Friendly and Non-Toxic


  • Some users argue that after just a few years of installation, the insulation loosened due to the poor quality tape.

Owens Corning 500824 Garage Door Insulation Kit – Best for Metal Garage Door

This is the best garage door insulation kit because it has all it takes to enhance the comfort in your garage. It features 8 durable R-8 fiberglass insulation panels that are made with a robust white vinyl facing that can be easily washed. The kit is designed with fastening system that gives a fast and secure way of holding all the panels in place.

As a precaution, use a mild detergent when washing the lean-able vinyl surface to avoid damaging it.

This garage door insulation kit is made with a flexor material so it is able to resist denting. It measures 12 x 16 x 24-inch in dimensions that makes it quiet compact for its big performance.

One kit is able to insulate a one-car garage door that measures about 9 feet in width. It gives a perfect fit to the protruding part of the door. This makes its thermal performance unique and impressive because it is 5 times superior when it is compared to an insulated door.

Based on the statistics of the standard human listening studies, this garage door insulation system will reduce the noise level emitted from the room by at least 20 percent when installed.

If you are installing the kit yourself, then we would recommend that you get a tape measure, a utility knife, a straight edge, and a marker.

Owens Corning 500824 Garage Door Insulation Kit is highly recommended to users with insulated metal garage doors.


  • Super easy to install
  • Speedy installation (at most 1 hour)
  • Washable vinyl surface


  • Panels cannot be painted
  • Some users feel that the two pins for attaching the insulation material are inadequate and you may have to use glue

Matador Garage Door Insulation Kit

Each Atlas EPS Matador Garage Door Insulation Kit comes with 8 boards. For double metal doors (16 x 18inch), you need to get 2 kits so you can have 16 boards. The reflective value of this insulation at 75°F is 4.8, and it only applies to the 1¼-inch thick panels.

The kit only weighs 10 pounds so you can handle it with ease, especially when it comes to installation.

This insulation panels is ideal for all kinds of weather because it will warm the garage during the winter and cool it during the summer. As such, it is recommended for users looking to cut on their heating and cooling costs. At 75°F, the insulation material has a reflective value of 4.8.

If you want a garage door insulation kit that will help your garage space look stylish, then this is the right brand for you. It has an elegant finish that makes the garage attractive. The surface is made of a bright white material that is readily washable.

Prior to the installation process, you need to get a straight edge, a utility knife, a tape measure, work gloves, and safety goggles.


  • For use on both single (8×9 inch) and double (16×18 inch) metal doors
  • The bright white surface, easy washable
  • Reduces the noise levels


  • Some users feel that the styrofoam material used makes the insulation kit look cheap
  • Need gloves to work

Reflectix BP24050 Bubble Pack Insulation – Best for Hot Climates

This insulation pack features a metallic foil surface that will effectively repel heat. This is because it is designed with an air bubble lining that will prevent the transfer of heat in the room. It is ideal for use in crawl spaces in your home, the attic, wall, post, metal buildings as well as frame structures.

Unlike most of its counterparts, this insulation kit is uniquely designed with fiber free material. This renders it lightweight for portability and handling when installing. Furthermore, the material is environmentally safe. To be specific, this insulation kit weighs about 5 pounds for convenience. It features a reflective value of 14.3, which makes it 97 percent reflective.

It is made of 7 layers with two outer layers made of aluminum foil that reflects and hits the heats. Every foil layer is further blended with polyethylene, a material known for its toughness and ability to strengthen the boards. The insulation material has two inner layers with bubble, so that it can resist the passage of heat.

The core layer of this kit is made of polyethylene for extra strength for durability. Two inner layers of bubble pack resist heat flow, while a center layer of polyethylene gives additional strength.


  • Lasting and flexible material
  • Double sided, easy to install
  • Reflects 97% of the heat radiated


  • Double-sided tape may be required to install

Reach Barrier 3009 Garage Door Insulation Kit

This might just be the best insulation kit in the market because it features the Reach Barrier Reflective Insulation and bubble barrier technology. This innovation is able to reflect 95 percent of the radiant heat, thus helping you to save on energy and utility cost.

You will get 8 panels that are precut and easy to install. These panels are constructed of 5/32 inch Barrier Bubble sandwiched between 2 layers of Reflective Polyethylene.

The polyethylene material is used to enhance the reflective ability of the kit besides improving its durability. This kit is designed as per the new ASTM fire code standards.

It also comes with Acrylic Adhesive one inch square Stick’ms that are easy to use thanks to the simple instructions included. In fact, while installing this product you do not need any tools or protective gear.

This garage door insulation kit only weighs 3.32 pounds so it is easy to carry, handle, and install.


  • New fire codes
  • Reflective polyethylene
  • It is durable and easy to use


  • Some users say that the bubble wrap may come partly deflated
  • Some panels are not the same size

Garage Door Insulation – Buyer’s Guide

If you’re thinking about replacing your garage door with an insulated model—or adding insulation to an existing door—you’re making a great investment. While insulating a secondary structure like a garage might seem like an unnecessary venture on the surface, doing so can actually save you money in more ways than one.

If you enter your home directly through the unheated garage, you’re losing heat every time you open the door. Even if your garage isn’t attached to the house, colder temperatures translate into more wear and tear on vehicles. Other things that are commonly stored in garages, such as paint and cleaning products, will also suffer from long-term exposure to extreme cold.

So now that you’ve decided to invest in garage door insulation, where do you begin? That’s where we come in. This handy guide will tell you everything you need to know about the different types of insulation available, including which materials work best in various climates, which perform best during the winter months, and how the results differ based on varying door types.

Types of Insulation


You’re likely already familiar with this type of insulation, even if you don’t realize it. Fiberglass insulation is made up of miniscule glass fibers, and is often sold in rolls (also known as “blankets”) or as loose fill. The material bears a resemblance to cotton candy, but is highly irritating to the skin. It works by trapping pockets of air around the fibers, thereby keeping out extreme cold or heat. When used in a garage, fiberglass installation also works as a buffer against street noise.


Polystyrene foam is made of recycled matter, making it a “green” insulation alternative. The foam is usually sold in large sheets that can be cut to fit the dimensions of your garage door. It’s more rigid than fiberglass and polyethylene foil (see below), and can therefore be somewhat difficult to work with. However, it’s also long-lasting, waterproof, and provides a decent sound barrier as well as protection from extreme temperatures.


This type of insulation is composed of highly flexible foil bubble wrap that works to trap and reflect heat, keeping it outside during the warmer months and inside when it’s cold. Sold by the roll, it’s typically about an inch and a half thick and easy to cut to your desired specifications. Unlike fiberglass and polystyrene foil, though, polyethylene does little to keep out street noise.

Understanding R‑Value

When you’re shopping for insulation, you’re bound to hear the term “R-value” a lot. The “R” stands for “resistance,” and the term refers to the material’s ability to prevent temperature flow. The higher the R-value, the more efficient the insulation will be.

If you have a detached garage, and it already has insulated walls, then you should look for an R-value of 10 or higher. If it isn’t insulated, an R-value of six should get the job done. For attached garages, seek out an R-value of at least 12, especially if the rest of the space has insulation already in place.

Insulation for Different Door Types


With their unyielding construct, steel garage doors can handle just about any kind of insulation. Flexible fiberglass insulation and foil bubble wrap can be inserted into the frames. Note that if you opt for the former, the fiberglass side should be touching the door, not facing outward. the Similarly, you can cut polystyrene boards to fit into the different-sized panels.


The rigidity of polystyrene foam works better with wood-paneled garage doors. Cut the foam boards to fit into the recesses between the door frames. To create an even more effective barrier, use two layers instead of one.

If your garage door has windows

If there are windows in your garage door, it’s a good idea to add a layer of sealant around the edges once the insulation is in place. Polystyrene foam is typically a better choice for this type of door, but this depends on the shape and location of the windows. If you have a typical row of rectangular windows at eye level, the foam boards should work well. Otherwise, you might prefer one of the more flexible options.

If the garage door is flat

Polystyrene foam and polyethylene insulation are the best options here. They can easily be affixed to the interior of the door using double-sided tape or strong glue.

If you have a garage door opener

In these cases, you’ll definitely want to err on the side of flexibility. Opt for polyethylene or fiberglass—the latter if you’re also trying to create a sound barrier. Make sure that the insulation is installed properly, so it doesn’t get caught on the machinery when the door opens and closes.

Garage Door Insulation for Hot Climates

When you’re trying to insulate against heat, your best option is radiant barrier insulation. This consists of two reflective sheets (typically Mylar, the material used in those shiny balloons found at the supermarket) on either side of a bubble core. Alternatively, you can just use cardboard, but this method is not as effective, and can even pose a fire hazard if the material gets too dry.

When installing radiant barrier insulation to protect against heat, make sure to leave an air gap between the door and the insulation. This can be achieved by cutting off a few strips of the insulation, making sure they’re long enough to reach from the top of the garage door to the floor, plus several inches. Affix these strips to either end of the door, with at least one in the middle (two, if the door is extremely wide).

When you add the main layer of insulation, make sure there’s at least a half-inch of space between it and the garage door.

Garage Door Insulation for Winter

Insulating a garage for winter can save you money on vehicle wear and tear, as well as heating costs. Since the job can typically be done within two hours, it’s an investment worth considering, especially if you live in a region that sees particularly harsh winters.

When insulating against cold temperatures, choose a material with an R-value of at least 6. Fiberglass insulation is usually a good choice here, as long as it’s at least two inches thick—the material carries a typical rating of R-3 to R-4 per inch.

It’s also a good idea to apply additional weatherstripping to the top, bottom, and sides of your garage door in preparation for winter. If your garage door is made of wood, you can invest in a nail-on weatherseal.

Metal doors usually have an existing track at the bottom, where you can slide the product on directly. Now is also the perfect time to add caulking to windows and fill in any cracks in the areas around the door.

Frequently Asked Questions

How much can I expect to spend on insulating my garage door?

Insulating a single standard 9-foot garage door should cost around $100. That’s if you perform the job yourself, without hiring a professional. If you already have some of the materials on hand (see “Do I need to purchase a garage door insulation kit?”, below), the cost will be that much less.

Do I need to purchase a garage door insulation kit?

If you’ve already purchased the insulation itself, a kit is not necessary. However, if you’re new to home improvement projects and would feel more comfortable with additional instructions, feel free to invest in one. They generally cost between $50 to $75, and contain sufficient material to insulate a single 9-foot garage door.

Here’s what you can typically expect to find in a garage door insulation kit:

  • Either foam or board insulation (check the specifications before purchase to be sure it’s what you’re looking for)
  • Tape or other fastening material
  • A foam cutter or knife (only in high-end kits)
  • Gloves (only in high-end kits)

Does the insulation add a lot of weight to the garage door? Should I be worried about this?

For a standard 9-foot door, the added weight usually isn’t significant enough to pose an issue. If your garage has a larger door, however, the insulation might cause undue strain on the opening mechanism. In these cases, it’s best to consult a professional before beginning the job.

In Conclusion

If you’re thinking about replacing your existing garage door with an insulated model, first consider whether a total replacement is really necessary. It’s neither particularly expensive nor time-consuming to perform the installation yourself, and the rewards will be well worth it. As long as you’ve gained some basic knowledge of the materials, and understand how the methods differ based on climate and construct, you’re already several steps ahead of the game.

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