It is more like 2-3 times, depending on the outside temparature and degrading rapidly below e.g. -5C. Also, there is a noticeable effect on quality of life (noi

It is more like 2-3 times, depending on the outside temparature and degrading rapidly below e.g. -5C. Also, there is a noticeable effect on quality of life (noise, sometimes uncomfortable air currents).