Our windows can have very good thermal insulation properties which can significantly reduce heating bills. By retaining heat for longer within the property, heating time. This means they are very effective at preventing heat from escaping your home during the colder months. When your windows are efficient at retaining heat, your heating system doesn't need to work as hard or as frequently to maintain a comfortable temperature. As a result, you can significantly reduce your heating bills, as less energy is required to keep your home warm.