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Reduce drafts around windows
Reducing unwanted air leakage can reduce heating demand.
What changes the result
Savings depend on the building, climate and heating system; adequate ventilation remains necessary.
Check what you already own before buying something. The benefit comes from repeated use.
References in the original project +
US DOE (2023); BRE UK (2019); EU Commission (2023)
These bibliographic references come from the original cards. They provide context; they do not validate every numerical assumption below.
