Most Japanese-made sashes function as dehumidifiers in winter!

The other day, I accidentally said "poro" during a performance at a certain sash manufacturer.
The big hit was this "sash that acts as a dehumidifier"
It was a statement.
One person made people laugh with self-deprecating jokes such as, "I've been selling dehumidifiers all this time!"
Just recently, when the room temperature was 20℃ and the outside temperature was 0℃ (the coldest day of the year in Tokyo or Osaka),
If the optimum humidity level is kept at 50% (around 6am, the coldest time of the day), the resin aluminum sash, resin angle
Regardless of the type of glass used, sashes and aluminum sashes will always experience condensation on the bottom frame.
The simulation results are out.
The only frames that can be said to be completely free of condensation even in the most severe situations are those made of resin only and wooden frames.
Or it seems that the only ones available now are ultra-high performance aluminum frames, which are only available in Europe.
In addition, even if the moment is not as severe as this, condensation may occur over a longer period of time on resin aluminum.
It is known to occur.
In winter, humidification is essential to maintain a healthy and comfortable indoor environment.
In order to prevent the ridiculous phenomenon of dehumidification, it is extremely important to insulate the sashes well.
Of course, there is no need to go into such complicated matters because no one likes condensation.
I think so...