Is the amount of draft coming through your windows making your home feel like an extension of your breezy backyard? Then take a look at some of the best window insulation solutions in this article. They’ll help you keep your home toastier than ever!

Here are the best insulation types and kits for windows:

Best Insulation TypesBest Insulation Kits
WeatherstrippingWindow film
Foam sealantRemovable magnets
CaulkAir bubble reflective foil
Thermal curtains

Is this going to be your first time DIYing your window insulation? Then you’re no doubt keen to find out how these methods work. Follow the guide below to find out how to install the best insulation for your windows.

Best Insulation Types for Windows

There are lots of different options out there for insulating your windows. But which type will be best suited to yours? Here is a list of some of the most popular types.


Ok, so first things first. What is weatherstripping?

Weatherstripping is a seal that you press on top of the gaps between your windows. Weatherstripping is self-adhesive and comes in various thicknesses. It also comes in an array of colors so that you can choose one that will best blend into your windows.

Weatherstripping is effective against the following:

Weatherstripping does more than shield your home from outside elements. It also helps to protect your windows. This is because it cushions the impact on them when you pull them shut. This helps to keep your windows in good nick for as long as possible.

So, how does it work? Here are some simple instructions for installing weatherstripping.

  1. Unroll the weatherstripping and cut it to the size of the gap you would like to seal.
  2. Remove the adhesive side of the stripping from its backing and push it into the desired location.
  3. Use the end of a paintbrush to force the stripping into corners and other hard-to-reach areas.
weatherstripping on a window
Weatherstripping is good for protecting your windows from the elements, and cushions them from any impact

Foam Sealant

Now let’s get the low down on foam sealants. What is a foam sealant?

A foam sealant is a spray polyurethane foam. When applied, this foam expands to insulate and air seal two surfaces. Most foam sealants can seal gaps up to one inch thick.

Foam sealant is ideal for protecting your home against the following:

  • Wind
  • Moisture
  • Pests

This sealant is made of foam. So does that mean it’s not strong? Far from it! Foam sealants can withstand building and material movement without compromising its seal. It can also withstand harsh UV rays.

But how do you use it? Here are the instructions you need.

  1. Remove the trim around your window.
  2. Put on gloves.
  3. Shake the can of foam sealant for 30 seconds.
  4. Point the nozzle into the crevices of the windows. (Some cans come with a straw that you will need to insert into the valve before operating.)
  5. Squeeze the trigger to release the foam into the desired area.
  6. Leave the foam to continue expanding for a few hours.
  7. Once the foam has dried, replace the trim around your window.


What is caulk?

Caulk is a material made of flexible sealing compounds. You can use it to seal gaps and cracks in your windows. Because caulk is flexible, it should withstand the opening and closing of the windows.

Caulk is effective at sealing your windows from the following:

  • Wind
  • Water
  • Dust
  • Insects

Are you new at caulking? Are you wondering how to get started? Then here are all the instructions you need.

  1. Use a putty knife to remove any old caulk from the grooves of your windows. Remove any dirt and dust from the windows too.
  2. Dry the grooves and cracks in your windows with a cloth before proceeding.
  3. Cut the tip of the caulk tube at an angle so that you can apply the caulk as you would ink to a page in a book.
  4. Start in the corner of the window. Pull the trigger slowly to release the caulk into the groove. Move your hand slowly across the window to the other side releasing the caulk in one smooth motion.
  5. If the caulk has spilled away from the groove, use a putty knife to push it back into place.
  6. Allow the caulk to dry for 24 hours before closing the window.
caulking a window
Caulk is great for insulating against wind, dust, water, and insects

Thermal Curtains

Here’s a nice traditional way of insulating your windows. The installation is easy and as stylish as you want it to be!

What do thermal curtains do?

Thermal curtains act as a barrier between the cold draft of the window and your home. They usually have a layer of acrylic foam between their fibers that helps to block cold air.

Thermal curtains work to do the following:

The installation of thermal curtains may be the easiest we’ve discussed so far today. Simply hang them up and start feeling the benefits immediately!

Best Insulation Kits for Windows

Insulation kits contain everything you need to shield your home from the elements. Are you wondering which insulation kit will be best for your windows? Then take a look at some of the most popular options listed below.

hot drink in front of rainy window
Keep warm air in using a cheap window film

Window Film

Ok, so window film. We know that this has got nothing to do with watching films with a view out the window. So, what is window film?

Window film is a laminate film that you can install on the inside or outside glass of your window. The film is thin and made of layers of strong polyester laminate.

Window films do the following:

  • Keep cold drafts out
  • Keep warm air in
  • Save energy and reduce heating costs
  • Reduce condensation
  • Prevent frost build-up

Window film kits work wonders. But how do you use them? Here’s what you should do.

  1. Thoroughly clean your windows removing any dirt or paint from the glass. Dry them with a lint-free cloth.
  2. Cut the film to the width of the window. It is recommended that you allow for an extra inch of window film on both sides.
  3. Apply the mounting tape around the window frame.
  4. Remove the paper liner.
  5. Apply the film to the tape, stretching it to remove any wrinkles. Use a hair-dryer to remove any persistent wrinkles from the film.
  6. Trim away the excess film from around the window.

Removable Magnets

A removable magnet kit is a great way of covering over the window without losing any natural light. What are removable magnets?

Removable magnets cover the window with a shield. The magnets lock onto the window frame. The shield is easy to clean and helps to prevent heat loss. It will even keep the home cool in the summer when you use air conditioning.

Removable magnets are effective at doing the following:

  • Keeping the home warm in the winter
  • Keeping the home cool in the summer
  • Lowering energy bills between 25% and 50%

Removable magnet window shields are popular because they do not interfere with the appearance of the window. They are easy to install and remove as and when necessary.

So, how do you install removable magnets? Here are the instructions.

  1. Clean the window frame and allow it to dry
  2. Peel the backing strip off of the magnetic tape and stick it onto the window frame.
  3. Lay the magnet strips on top of the magnetic tape.
  4. Press the plastic strip onto the film and then push the corners into place.
  5. Cut the shield down to size with scissors.

Air Bubble Reflective Foil

Here’s another great window insulation kit. What is air bubble reflective foil? This is it in a nutshell.

Air bubble reflective foil is a super-strong wrap for weatherproofing windows. The foil is made up of two layers of polyethylene, metalized aluminum. There are industrialized air bubbles between the aluminum layers. You can fasten the foil over your windows.

Air bubble reflective foil will help to protect your home against the following:

  • Water
  • Humidity
  • Pests
  • Cold
  • Wind

But that’s not all as the air bubble reflective foil will also help you save money on your utility bills. Sounds like a winner, right?

But what about the installation? How do you use air bubble reflective foil? It’s dead easy.

  1. Measure your windows then cut your air bubble reflective foil to size. You can use scissors or a utility knife to cut it.
  2. Fix the air bubble reflective foil into place using staples, glue, or nails.


Finding the best insulation types and kits for your windows can be a tricky task. This is because there’s a whole world of options available for you to choose from. I hope this article has helped you to find a solution that will best suit your windows. I’m sure it has also shown you a trick or two for applying your chosen insulation!

If this article has helped you, then why not check out some of our other articles and free guides? You could even sign up to our email list!

Have a great day!