How to Winterize Windows & Keep the Cold Out

Drafty windows raise winter energy bills as warm air escapes and cold air enters, making your heating system work harder. Winterizing your windows ensures even small fixes cut heat loss, lower utility costs, and keep your home comfortable through the cold months.

In this guide, you’ll learn the benefits and the best methods for preparing your windows for winter and keeping them ready for harsh conditions.

Common Methods for Winterizing Windows

Here are some of the most effective and popular methods for winterizing your windows:

1. Weatherstripping

Weatherstripping seals gaps around frames, improves insulation, and lowers heating costs. Spray foam, vinyl strips, and brush seals install easily with adhesive or tools. Apply around sashes, frame edges, and joints where air leaks are most common.

Pros: Affordable and effective for drafty sashes.

Cons: May change the window appearance and won’t solve cold glass issues.

2. Caulking

Caulking is another essential part of winterizing windows. It helps seal cracks and gaps in your window frames, preventing drafts and moisture infiltration.

Use an exterior-grade product, remove old caulk, and apply fresh beads where frames meet walls or sills. Apply before temperatures drop for best adhesion. For best results, apply caulk before temperatures drop too low so it adheres properly.

Pros: Inexpensive, seals cracks effectively, improves energy efficiency.

Cons: Can be messy, must be applied in the right conditions, and may damage frames if old caulk is removed incorrectly.

3. Storm Windows

Storm windows add an extra layer of protection over existing windows, creating insulation that reduces heat loss in winter. They are less costly than full replacements and can extend the life of older frames.

Pros: Affordable alternative to replacement, boosts efficiency, preserves existing windows.

Cons: Requires seasonal installation and may change the exterior appearance.

4. Plastic Film

Plastic film is a budget-friendly option for winterizing your windows, particularly for older windows with single-pane glass.

Apply inside with double-sided tape or a shrink kit to create a tight seal. Available in clear, tinted, and insulated types, film reduces drafts during winter and can be removed in spring.

Pros: Low cost, quick installation, noticeably reduces drafts.

Cons: Short-term solution, less attractive, must be removed to open windows.

5. Additional Insulation

Insulating windows in winter is a more permanent solution for improving energy efficiency and reducing drafts.

Consider double- or triple-pane glass during replacements. Thermal curtains, blinds, or cellular shades also help trap warm air and cut heat loss.

Pros: Strong energy savings, multiple options to fit your budget.

Cons: Higher cost for upgrades like triple-pane glass, curtains or shades may reduce natural light.

6. Control Indoor Condensation

Moisture on windows shows that indoor humidity is too high. Keep indoor levels at 30–35% with fans, dehumidifiers, or open blinds. If fog appears between window panes, the seal has failed, and the glass should be replaced.

Pros: Improves comfort and prevents mold growth.

Cons: Requires ongoing attention and may reveal bigger window problems.

7. Try Draft Stoppers

Draft stoppers, also called draft snakes, are fabric tubes filled with dense material that block cold air from leaking in under windows. They are an easy DIY project and a quick solution for small drafts.

They work best at the base of the window and can be removed when not needed. Many people make them at home using old fabric and filler like rice or sand.

Pros: Cheap, easy, and removable.

Cons: Only protects the window base and doesn’t create a full seal.

8. Consider Full Window Replacement

If your windows are outdated or beyond repair, replacement may be the most effective solution. ENERGY STAR® certified models can reduce heating and cooling bills by up to 20%.

New windows also improve comfort, boost property value, and enhance your home’s appearance. Professional installation ensures the best results.

Pros: Permanent solution and adds value to the home.

Cons: Higher cost and requires installation by a contractor.

Want to be sure you don’t miss a step? Download our free window winterizing checklist and follow along.

Professional Winterizing Windows​ vs. DIY

At this point, you may be wondering whether to take on winterizing yourself or hire a professional. The choice depends on your budget, time, and comfort level.

DIY works well if you have the skills, time, and a limited budget. Apex Window Werks provides professional window winterizing for homeowners who want lasting efficiency, warranty-backed results, and the convenience of expert service.

Create a Warm and Energy-Efficient Home with Apex Window Werks

Ignoring drafty windows can lead to mold growth and higher energy bills. At Apex Window Werks, we understand the importance of keeping your home comfortable and energy-efficient throughout the winter. Our team of experienced professionals can help you determine the best solutions for your home.

Contact us today for a free consultation and let us help you create a cozy and energy-saving home this winter!