Download The Best Insulation for Sealing Windows | Gold Star Insulation
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What’s the Best Insulation for Windows?

When insulating your home, you don’t want to overlook a huge source of energy loss –your windows. Poor window insulation can cost you thousands from tiny air leaks.

Finding the right insulation for your windows is one step to creating a more energy-efficient and comfortable home. In this blog post, the experts at Gold Star Insulation discuss the best insulation options for windows.

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Most Common Window Insulation Options

Insulation installed in an unfinished home.

There are several options for window insulation, but the two most common types are fiberglass and spray foam. Both have their advantages and are effective in sealing air leaks.

Fiberglass Insulation

Fiberglass insulation is an affordable option and is relatively easy to install. It provides a basic level of insulation and is suitable for various applications. However, it may not always offer the best seal against air leaks.


  • Cheaper than spray foam
  • Can sometimes be easier to install if you’re DIY’ing
  • It doesn’t expand, which is good in small spaces


  • It doesn’t seal as tightly as spray foam
  • Less energy-efficient
  • Can settle over time, requiring you to add more insulation

Spray Foam Insulation

Often referred to as window foam or insulating sealant, spray foam expands to fill gaps and create a tight seal around your windows. This expanding quality makes spray foam insulation highly effective in preventing air leaks and improving energy efficiency.

We highly recommend spray foam for the best window sealing results.


  • Expands to fill gaps to provide a better seal
  • More energy-efficient
  • Lasts longer and is effective for longer than fiberglass


  • Costs more to install than fiberglass
  • Requires professional installation — no DIYing
  • Can expand too much if installed incorrectly, causing issues with your windows

Do You Need Weatherstripping Around Windows?

Another common question is if weatherstripping is sufficient for window insulation. While it’s a low-cost solution, weatherstripping is often less effective and durable. It can easily allow air to flow through cracks and doesn’t offer long-term solutions.

In contrast, more robust insulating methods like spray foam provide a lasting seal and better energy efficiency.

Contact Gold Star Insulation To Learn More About Insulating Your Windows

Choosing the right insulation for the windows in your Sacramento home can save you money all year.

While spray foam is our recommended method for the best sealing, Gold Star Insulation also offers energy audits to identify all areas of your home that are leaking air. We provide comprehensive air sealing services to enhance your home’s energy efficiency and comfort.

Our experts are dedicated to helping you achieve the best insulation solutions for your home. We’re proud of our professional recognitions, including having a BPI-certified professional on staff and being a BBB-accredited business with an A+ rating.

Want to improve your home’s energy efficiency and comfort? Call Gold Star Insulation at 916-229-8445 for expert insulation services in Sacramento.

Let us help you seal those air leaks with the best insulation solutions for your windows.

Where should you insulate in your home? Check out our interactive infographic:

Products We Install
Energy Audits

Our team can help you save money with a home energy audit and air sealing services.


Our insulation team installs batt and blown-in fiberglass insulation.


Environmentally friendly and effective, cellulose works well in homes and buildings.

Spray Foam

Gold Star Insulation is a leading installer of spray foam insulation in the Sacramento area.

Radiant Barrier

An attic radiant barrier can help keep your home cooler and more comfortable.

Insulation Removal

Gold Star Insulation provides home insulation removal services.

Air Sealing

We are committed to saving you money by sealing your attic—which is the main source of air leaks in the home.

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