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I live in a cottage of about thirty years. The windows are single-glazed, the window-doors double-glazed, but all these openings let small air streams. if I renovate, would I get a real thermal improvement, given that they will have aerations? is the gain real, given the total cost? thank you

It is essential that insulating windows have ventilation openings. If this were not the case, it would be necessary to drill in the walls... Naturally, these ventilations are not contradictory with the improvement of the thermal insulation of your chalet. Yes it will be improved, knowing however that a wooden chalet is by nature well insulated.

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Video Instruction: Ep. 06. Self-Build House / Chalet, External Insulation and Windows, Jasna, Slovakia.