There is no news for anyone and it is not a secret that 40% of heat loss comes from windows. That’s why the insulation of windows is a very important and mandatory event before winter, especially if you do not have plastic windows in your apartment.
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The simplest and most convenient way has long been just to score all the cracks with cotton wool and glue everything on top with thick paper or cardboard. Here a screwdriver will help you, with it, push the cotton wool into all the cracks and joints where the cold is felt. To accelerate the process of insulation, it will be easier and more efficient to buy a painting or ordinary tape.
If the holes are very large, then ordinary plasticine will come to the rescue.
Also if there is a large distance between the frames, then it can be filled with the same cotton wool or, at worst, rags. This will greatly reduce heat loss.
You can use except rags, cotton and tape also rubber tubes and belts, and the wider they are, the warmer it will be. It will need to be tightly put into the space between the shutters and the frame and strengthened with tape.
And, finally, the most modern way to save heat is a sealant, as it penetrates and fills all the cracks. It will be necessary to purchase a gun for it, it will be convenient to work.
Well, if the fault is a windowsill, then it is worth opening it and inspecting it inside. Now so far to warm it with rags and cotton wool, and in the summer to cement.