Paper trick: Use an A4 sheet of paper to check your windows for leaks

Leaky windows ensure that all the heat escapes outside. You can use a sheet of paper to test whether your windows are still completely airtight or whether the rubbers should be replaced. But there is also a second method.

The one with one Links marked with a symbol or underline are affiliate links. If a purchase is made, we will receive one commission – at no extra cost to you! More info

This winter, many tenants and homeowners are turning off the heating to save money. The fear that the bills will otherwise be unaffordably high is too great.

In most cases, however, it is not possible to completely do without heating, as this can have health consequences and also promote the formation of mold in the apartment. That is why you should keep the heat in the living room as good as possible. Sealed windows are the be-all and end-all.

But how can you check whether a window seals really well without special tools? We’ll show you how it works.

CHIP – Saving electricity made easy – PDF

Energy has never been as expensive as it is now. But instead of panicking, you should calmly check potential savings at home. As our guide shows, there are many of them.

The paper test

All you need for this method is a sheet of paper, normal copier paper will do. Open the window and place the side between the window frame and sash. Close the window again.

If the sheet gets stuck, then there is no need for action. If it pulls out easily, then your windows aren’t sealing properly. The reasons for this:

porous seals
Contact pressure of the window too low
Window frame is warped or incorrectly adjusted

Hints:
Run this test in multiple locations per window. Make sure that the blade does not block the mechanics, such as the roller pins or other moving parts.

If necessary, you can increase the contact pressure yourself and then try the test again. In any case, leave more complex work to the landlord who is responsible for the windows.

The candle test

The classic leak test with home remedies is the candle test. Just light a candle – a tealight is more suitable as there is less risk of wax stains.

Run the candle very slowly around the closed window sash. If the flame remains calm, then the window is tight, but if it begins to flicker, then the window may be leaking at this point.

A notice:
Always pay attention to fire safety! Clear away any flammable materials and, if necessary, remove curtains and drapes to do the candle test.