We know that the conditioning of buildings consumes around 30% of the energy we use around the world, and with the evolution of people living more and more in cities every day, this proportion will only increase.
There are many scientists working hard to find materials with passive technologies that help reduce this consumption. And in general these are paints that reflect part of the solar energy received and thus prevent overheating.
The problem is that it is necessary that in the summer the external heat does not enter the building, and in the winter the heat does not leave the building, and thus less energy consumption is needed to maintain a comfortable temperature inside.
I read that Chinese researchers at the Harbin Institute of Technology have developed a temperature-adaptive cooling coating that adapts to temperature, and they do this by mixing small microscopic capsules in a binder that can be applied to a sheet of metal. .
The micro-capsules contain polyvinylidene fluoride, which is a chemical that changes color depending on temperature.
This material changes its color depending on the ambient temperature, being light gray at 20ºC and more colorful when the temperature reaches 30ºC, in which case it reflects 93% of the solar radiation received.
According to the researchers, this coating reduces energy consumption by 20% compared to radioactive cooling paint. And something very important is that it is cheap and easy to apply.
The way I see it, the only problem could be aesthetic, and that some people don't like it when their house changes color. On the other hand, other people might find it very pleasant.
I find the idea very interesting, and we already know that colors vary according to taste.
EN 
ES_ES 