Should I Insulate My Garage Attic, Door or Walls? [Yes, Here’s Why]

The Most Important Thing You Should Know About Garage Insulation!!

No matter how much garage insulation you install, without a secondary heating or cooling source, like a garage mini split, you will never achieve a totally comfortable garage (unless you like really hot or cold temperatures). If you already have your HVAC unit connected to the garage then you are a third of the way there. However, if you are like most of us that don’t have fancy a/c or heating units connected to our garages then you are going to need the full boat.

The real key to achieving a totally comfortable garage is by installing garage attic insulation, garage door insulation, and a garage heating and cooling unit, also known a garage mini split (And, install garage wall insulation if walls are in really poor shape).

Below we will answer the questions to each type of insulation, but keep in mind, garage insulation can only affect the temperature of the garage by 20 degrees (up or down).

For example: If you live in Arizona, Florida, or Texas, only adding garage attic and door insulation would only mean dropping the temperature from 120 to 100; which is still too hot for any human or pet being to be in there for too long. Adding a garage mini split into this scenario could get the temperature down as low 70 degress or cooler if you like, while the garage insulation keeps all that cool air in for longer than if you didn’t have garage insulation.

Should I Insulate My Garage Attic?

The garage attic is where a lot of the heat in during warmer months of the year. A radiant barrier is great for keeping the heat out of the garage attic.

If you live in Sunny states like Arizona, Texas, and Florida, insulating a garage attic is a must if you want to keep your garage cool enough to withstand for short periods of time.

However, if you plan on spending any real time in your garage, meaning hours or more, you are going to need a lot more than garage attic insulation to make the temperature manageable enough to withstand for long periods of time.

If you are planning on turning your garage into a workshop, your next step should be to insulate your garage door.

Should I Insulate My Garage Door?

Your garage door is just as important to insulate as garage attic insulation. The garage door typically has gaps and small cracks where air can get through easily.

On a cool day that might be fine but, during the middle of the summer in Arizona where temperatures are near 120 degrees or above, those small cracks can turn into jet streams of hot air.

You can use all of the garage attic insulation you want but if you don’t insulate the garage door you are still going to wind up with a hot garage.

When You Should Use Garage Door Insulation

Yes, you should insulate your garage door if you want to:

• Make your garage door quieter
• Keep your garage warmer during the winter
• Keep your garage cooler during the summer
• Keep pests out of your garage
• Prevent moisture that leads to mold formations
• Seal in the cool or warm air provided by central a/c unit or mini split
• Make your air conditioning units in the garage run more efficiently
• Heat and cool your garage faster

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Should I Insulate My Garage Walls?

Insulating the garage walls is a very controversial topic as one could say that insulating garage walls is important if the garage walls aren’t sealed properly, have a lot of holes or cracks, aren’t using the right drywall or you can literally feel cool or warm air blowing through them.

Otherwise, insulating the garage attic and garage door should be enough. Those 2 areas plus a garage mini-split heating/cooling unit will give you the opportunity to keep the garage whatever temperature you like.

Only install garage wall insulation if your walls are in really poor shape, otherwise, you are just wasting money by over-insulating.

Should I Insulate My Attached Garage?

Yes, insulating an attached garage is a must if you don’t have a central a/c or heating system that extends into the garage space.

A lot of homeowners want to turn their attached garage into a workshop so insulating the garage attic and door is a must if you plan on doing something similar.

When You Should Insulate An Attached Garage

Yes, you should insulate your attached garage if:

• Your current attached garage doesn’t have insulation
• Your attached garage doesn’t have HVAC running through it
• Your attached garage is too hot or too cold
• You want to cool the attached garage space down to use it for other purposes

Should I Insulate My Detached Garage?

Yes, insulating an attached garage will get you 2 steps closer to obtaining the garage workshop or studio of your dreams! Furthermore, adding a mini split heating and cooling unit will make your detached garage a second home. You can literally use the space for whatever you like.

When You Should Insulate A Detached Garage

Yes, you should insulate your detached garage if:

• Your current detached garage doesn’t have insulation
• Your detached garage is too hot or too cold
• You want to cool the detached garage space down to use it for other purposes

Should I Install a Mini Split AC for My Garage?

Yes, installing a mini split ac unit for your garage will cool and heat it fast. However, if you want to cool or heat your garage efficiently, installing a garage mini split along with garage door and garage attic insulation are the most important steps to achieving that goal. The mini split will help cool or heat the space, and the garage attic and door insulation will seal the heat or cool air in for longer. Without insulation though, your mini split heating and cooling unit will have to run longer and cost you more money in electricity.

Should I Insulate My Garage in Arizona?

Yes, you should insulate your garage in Arizona if you plan on using it as a workshop, bedroom, studio, or to use for your pet.

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