Sealing older windows can significantly reduce heating costs. Installing weatherstripping is an easy task, and with just a bit of effort, you can turn inefficient windows into effective ones.
As the cold days approach, our homes face a big test. It’s crucial that your heating system works well, and insulation plays a key role. Even though the first frosty mornings may have arrived, there’s still time to make improvements. One of the most important aspects of saving energy during the winter is ensuring that your doors and windows are properly sealed.
The amount of heat lost through windows and doors can vary widely, from a minor percentage to enough that it has a noticeable impact on your heating bills. Not only will you end up paying more each month, but your home might also not feel as warm as it should. If you have a centralized heating system, you may not have the option to simply turn up the heat, so improving insulation is essential.
These tips are particularly useful for those with older wooden windows that don’t seal as tightly. However, even if you have newer PVC windows, it’s a good idea to check the settings on the window mechanisms to ensure they’re adjusted for winter, rather than summer.
For older windows, start by checking how well they seal. This is relatively simple to do in cold weather. With the windows closed and the room warm, run your hand along the edges to feel for cold drafts. Use the back of your hand, as it’s more sensitive to temperature changes than your palm. Drafts are often most noticeable near the bottom edges of the window, but that’s just where the cold air is escaping—its entry point may be elsewhere.
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To block cold air, you need to seal the entire frame, including the central joint if the window has two sashes. Weatherstripping is the most effective way to do this and is widely available at hardware stores, markets, or big-box “DIY” stores.
There are several types of weatherstripping, so choose what works best for your windows. Rubber strips are durable but may make it difficult to close the window if the gap between the window and frame is small. In such cases, foam strips are a better option. They can seal gaps of several millimeters and are soft and compressible, so they won’t interfere with window closure where gaps are minimal.
Both rubber and foam weatherstrips are self-adhesive. Simply peel off the protective backing and carefully apply the strip. Where you place it depends on your windows, but the goal is to create a complete seal all around the window. Imagine the window needs to hold back water—cold air will find a way in through even the smallest gaps. If any part of the frame is left unsealed, the draft will persist, even if reduced. With a bit of care, you can eliminate drafts entirely.
This DIY method for winterizing windows is highly effective, turning poor-performing windows into efficient ones. In some cases, however, DIY fixes may not be enough, and professional help may be required. Some options include sealing with aluminum strips or applying liquid rubber seals. These methods are more expensive, so before hiring a professional, you might want to compare the cost of new windows. Depending on your situation, upgrading to new windows may be a more cost-effective solution in the long run.