How to Detect Drafts Around Your Windows?

Before making any adjustments, it is essential to confirm that your windows are indeed allowing outside air to enter. A simple and effective method to check this is by using a candle or a lighter:
Gently bring the flame near the edge of the window.
Observe how the flame behaves: if it flickers, shakes, or goes out, this indicates the presence of air leaks.
If you notice this behavior, it is time to act quickly to improve the thermal sealing of your windows.
The Essential Tool: The Allen Key

The adjustment requires only one basic tool: an Allen key. Most PVC windows are equipped with a mechanism called an eccentric cam, which allows you to adjust the pressure the sash exerts on the frame depending on the season.
Step One: Locate the Eccentrics
Open your window and examine its inner frame. You will usually find three small metal eccentric cams positioned to distribute pressure onto the frame. These components enable you to adjust how tightly the sash presses against the sealing gasket.
Step Two: Adjust the Eccentrics for the Season
PVC windows generally offer two pressure settings:
- Winter mode: a stronger pressure to minimize heat loss.
- Summer mode: a lighter pressure to protect the gaskets from expansion caused by heat.
How to Make the Adjustment?
Insert the Allen key into the eccentric located on the frame.
Turn it inward toward the inside of the house to increase the pressure, ensuring better contact between the gasket and the sash for winter settings.
Repeat this process on all three eccentrics for a consistent and effective adjustment.
Step Three: Inspect the Condition of the Gaskets
Incorrect adjustment is not always the sole cause of drafts. Over time, rubber gaskets can wear out, lose their elasticity, and reduce their sealing ability. Check their condition by looking for signs that they:
- are cracked or hardened;
- have deformations or sagging;
- are clogged with dust or dirt.
If you find any of these issues, it is recommended to replace the gaskets to maintain optimal insulation.
Step Four: Perform a Final Test
After adjusting the eccentrics, conduct the lighter test again. If the flame remains steady and still, this means the sealing is perfect and your window is ready to keep the cold air out during chilly temperatures.
Why These Adjustments Are Crucial for Your Comfort and Savings

Properly adjusting your windows can bring many benefits:
- Significant reduction in energy consumption by limiting heat loss.
- Prevention of humidity and mold by stopping cold air from entering and condensing inside.
- Extension of the lifespan of the mechanisms by avoiding excessive pressure during hot periods.
In Summary: A Simple Trick for a Cozier Home
Taking just a couple of minutes to correctly adjust your windows ensures much better insulation. Adopt this quick routine to face winter more comfortably while saving money on your heating bills.
Share this tip with others so everyone can enjoy a home well protected against the cold.