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Window adjustment for winter and summer: all-year comfort
Learn how to correctly adjust your windows for winter and summer. Simple seasonal adjustment helps reduce heat loss, improve the seal, enable micro-ventilation and extend the life of your windows.
Published: February 26, 2026
10 min read
Window adjustment for winter and summer: all-year comfort
Did you know that many modern PVC windows have a hidden feature designed to adapt to Lithuania's changing seasons? It's seasonal adjustment — a simple mechanism that lets you change how firmly the window gasket is pressed.
Done twice a year, this small adjustment is an effective way to improve home comfort, increase energy efficiency and even extend the life of your windows. In this guide we'll explain the principle of winter and summer modes, how to do the adjustment yourself and when it's time to call a professional.
1. The "two seasons" principle: why adjust windows?
The goal of seasonal adjustment is to make your windows work smarter in both cold and warm weather.
In winter: the priority is keeping warmth inside and drafts out. Setting the windows to "winter mode" increases the sash pressure against the rubber frame gaskets.
Benefit: a better seal, lower heat loss, lower heating bills.
In summer: a tight seal is no longer essential. Switching to "summer mode" reduces pressure on the gaskets.
Benefit: better micro-ventilation, easier window operation, less strain on the gaskets and a longer service life.
2. DIY guide: how to adjust windows by season
Window adjustment is simple and takes only a few minutes:
Find the adjustment cams — open the window and look at the side of the sash.
Understand the marking — the position of the marker shows the pressure level. The closer it is to the gasket, the tighter the seal.
Winter mode — using an Allen key, turn the cam towards the room.
Summer mode — turn the cam towards the outside.
Check tightness — place a sheet of paper between the window and the frame. If it's hard to pull out, the seal is good.
3. When do you need professional help?
Call a technician if:
The frame is deformed or damaged.
You still feel a draft even in winter mode.
The handle or hinges are broken or stiff.
The window is badly out of adjustment.
Conclusion
Regular winter/summer window adjustment is a simple yet highly effective way to keep your home warm in winter and comfortably cool in summer. Just a few steps twice a year can reduce heating costs, extend the life of your windows and ensure maximum tightness.
If you'd rather have professionals handle it — book a window adjustment service anywhere in Lithuania here https://langu-remontas.lt
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The advantages of working with our team of professionals
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Frequently Asked Questions
Everything you need to know about our window and door repair services
Yes, the initial inspection and our technician's visit to assess the work are completely free. No hidden fees and no obligations. If you decide to go ahead, the technician will prepare a clear quote on the spot, explain everything to you and, if you agree, can usually do the work right away during the same visit.
Of course. We provide a warranty both for the work carried out and for the materials used, in line with the laws of the Republic of Lithuania.
The price depends on the type of window, the issue, and the materials needed. When the technician arrives, they give you an exact quote on site with no hidden charges, and you decide yourself whether you want to proceed with the repair.
Yes, our window service operates all over Lithuania: in Vilnius, Kaunas, Klaipėda, Panevėžys, Šiauliai and other cities and towns.
Booking a free visit is very simple. Just give us a call or fill in the online booking form – in both cases it only takes a few minutes.
In most cases repair is enough: replacing seals or mechanisms, improving insulation, adjusting the fittings, cleaning and lubricating the hardware. This is usually much cheaper than installing brand new windows.
Repair is cheaper, because you don't have to buy new windows, remove the old ones, dispose of them or redo the interior finishes afterwards. Repair saves both time and money and is significantly more cost‑effective.
We work with all major brands: Rehau, Veka, KBE, Schüco, Salamander, Aluplast and many others. Our technicians are trained to work with the specific mechanisms used by each manufacturer.
Yes, you can pay by all major bank cards, by bank transfer or in cash. Payment is made after the work is completed.
Yes, we provide services all year round. In winter we use specific methods so that the room doesn't get cold during the work and your comfort is kept to a maximum.