Window Insulation Guide: Keep Cold Air Away From Your Windows in 7 Easy Steps!

window insulation

In many regions of the globe, winter has already started. When there are extreme cold or hot temperatures outside, your home’s interior may suffer a lot because of this if the structure’s thermal envelope has not been properly done. 

The cold winds are entering your house, and you’re unable to find that place? You’re wondering why your place is not getting warm enough? Are you facing all these issues? The reason may be that your house has some openings or cracks where a heat loss is happening. 

But before you look at vast expanses like walls, ceiling, and flooring, consider smaller intrusion points such as windows. Probably your window insulation has not been properly done, or it’s got old. Don’t worry! There are several ways to decrease this loss, and the insulation of the windows can be easily done. Keep on reading, because today in this blog, we’re going to tell you how to insulate your windows in a budget-friendly way. 

Believe us, the window insulation is a simple and inexpensive project. After insulation, you can actually get huge benefits, such as saving on your monthly energy bill. Whether your windows are a decade old or new, you can easily do it in no time by this process. 

So, let’s start with the insulating process.

Tools and Supplies You Will Need

Here is the list of things that you’ll need in the entire procedure: 

  • Putty knife
  • Clean rag
  • No-drip caulking gun
  • Exterior-grade caulking 
  • Claw hammer
  • Paper towels
  • Household cleaner
  • Tape measure
  • Weatherstripping
  • Scissors
  • Utility knife
  • Insulating window film
  • Heavy curtains

How to Insulate Windows?

Below are seven easy steps by which you can easily insulate your windows in no time. For your convenience, we have divided it into two sections: exterior and interior of the window. So one by one, read each step carefully and follow the same procedure to insulate your windows. 

Insulate Window Exteriors

Decades of exposure to the harsh weather conditions, the exterior side of your windows might have cracks and gaps. The main thing that prevents heat loss is the exterior caulking, and once it begins to crumble and cracks, it couldn’t do its job. So remove the old caulking and replace it with the new one.

Step 1: Check the Windows 

 how to insulate windows


The first step is to determine which windows need to be sealed. Only seal those who require the insulation, instead of sealing them all. It is a crucial step if you want to save money and time, so check every window of your house. There are multiple ways to do this, so choose the one that works best for your current conditions. 

Step 2: Remove the Old Caulking

 how to insulate windows


With the help of a putty knife, scrape the window edges and remove the old caulking. Then wipe the surface with a damp rag. Keep it untouched and let it dry for at least a few hours before you start the insulation process. For more guidance, read our blog on how to remove old caulking.

Step 3: Add Caulk to Gaps and Cracks

 how to insulate windows


When the outer area of the window dries completely, then it’s time to fill the gaps with new caulking. Take a no-drip caulking gun and hold it at a 45 degree in order to fill the deep cracks and holes around the window frame. 

Apply a solid and continuous bead of caulking between the siding and the frame all the way around the window. If any caulk oozes out from a hole or crack, then push it inside with a putty knife. After you’re done, leave it overnight to dry completely. This will provide you the best protection from the moisture and wind. 

Insulate Window Interiors

If you don’t know, the sash is the part of the window that moves to open and close. While insulating this, don’t ignore the window glasses. Whether by weatherstripping, window film, or energy-smart window treatments, insulate the inside of your windows. 

Step 4: Add Weatherstripping

 how to insulate windows


Check whether your weatherstripping is worn or crumbling or not. If yes, then it’s time to replace it. This adhesive-backed stripping can easily be pulled up by hand. Once you remove it, clean the area with a damp cloth or paper towels. 

To apply the new weatherstripping, first, measure the sash carefully. Then cut it according to the measurements. Start with one side of the sash and do it as close as you can. Peel off the adhesive backing and start pressing down the weatherstripping on the sash. Keep doing this until the whole window is covered. 

Step 5: Insert Spray Foam

window insulation


If your windows have significant gaps or holes around the window frame, you should fill them with polyurethane, expandable spray foam. With a long nozzle spray gun, you can quickly fill those gaps with spray foam. 

Step 6: Install Energy Efficient Window Treatments (Thermal Curtains)

window insulation


The second last step is to prevent your windows from heat loss and drafts; for that, you have to do window treatments. They’ll provide extra insulation, so hang thick, full-length curtains. They come in two forms: thick side-drawn draperies or vertically-drawn pleated (or cellular) blinds. You’ll be surprised to know that a set of heavy curtains can cut heat loss by 17percent!

The difference between the two is that the draperies are thicker, and they also block the air infiltration. In comparison, the cellular or pleated blinds can move upland down. They also do control air infiltration but less as compared to the draperies because they are too light to prevent air from moving into your home. To get the best insulating results, install the curtains just above the window, so the curtains fully are able to cover the window frame. 

Step 7: Use Draft Stoppers

window insulation


For the last defense, use a fabric draft or draft snake stopper to block the gaps between the window frame and window sash. You can also make this at-home by sewing fabric into long tubes.

window insulation


When to Insulate Your Windows

According to experts, the ideal time to insulate your windows is before the cold weather starts. But that totally depends on your local weather conditions. Also, don’t forget to cover yourself with sweaters before you open your windows. After you’re done insulating your windows, you’ll see massive changes in your energy bills not just in the winter season, but all year round. 

For more architectural guidance and home improvement ideas, keep coming to Interiorcraze.

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