Windows are getting more and more technologically advanced, but things can still go wrong with them. We’ve put together 7 of the top warning signs you need to look out for so you can ensure you don’t end up replacing your windows more frequently than needed.

1. You get condensation in the centre of the window inside the house

If you have this problem, it could mean you’ve got a gas leak in the window. Windows are normally filled with argon, and this can leak out from between the two panes or settles to the bottom of the window. If it settles at the bottom of the window, the glass can bow inward.

Argon is an insulator, so if this gas leaks out you’ll find it might be colder during the winter. The only way to solve the problem is to replace the window, and if it happens during the warranty time you may be covered.

2. You can see condensation between the panes of glass

The seals on the window have failed or are deteriorating if you notice condensation inside the window. It means that air is getting in from outside, and moisture gets trapped in between the panes. You don’t have to have the entire window replaced – normally you can just replace the panel.

3. Your casement windows won’t open and shut properly

As casement windows move on a track, debris can build up in there. Mechanisms will wear out, but you can easily replace these parts.

You could also consider using a lubricant along the track to help it move. On weatherstripping, use a dry lubricant that is not oil-based so it doesn’t attract dirt and dust and get sticky.

4. Condensation keeps forming along the bottom or corners of the glass

If your windows keep getting condensation along them, it means that your home is not ventilated properly. It could also mean that it is very humid in your property.

If you get constant condensation along windows and don’t dry it off, you will get mould and mildew. It could also mean that wooden window sills rot too.

Try to open a window for 15 minutes a day, and run bathroom extractor fans where you can.

5. You’re finding it’s draughty around the windows

If you’re getting chilly sitting near your windows, the sashes or the weatherstripping will need to be replaced. Choose a window that is more energy efficient. Look at the U-value – the lower the number, the better the insulation.

6. Your double-hung window is difficult to open and close

If you’re having trouble shutting your double-hung windows, the wood is probably swelling. If the window is only difficult to open and close when it is damp and humid, you could sand down the wooden panes so you can move them easily all the time.

You could try adding a silicon lubricant to the sliding track to help it along, but it’s also very common to have to replace mechanisms such as tension springs, that help to move the windows, every 5 years.

7. There is water around the window

If water is coming in around the window, it means it’s not closing tightly enough. If you lock the window, this can help it to close more tightly. If it rains heavily, water can collect in the window track.

Watch out for water leaking near the top, especially if the window is shut as tightly as possible. This could mean that the leak is from somewhere other than the window, like the roof or the siding, and the water is just dripping down the wall and coming in the window.