This was introduced last year.
My argument is you can always put on more clothes to keep warm but it's harder to get cool.
I think ideal sleeping temperature is below 16
Spain has announced new energy-saving measures, including limits on air conditioning and heating temperatures in public and large commercial buildings, as it becomes the
latest European country to seek to reduce its energy consumption and its dependence on Russian oil and gas.
Under a decree that comes into effect in seven days’ time and applies to public buildings, shopping centres, cinemas, theatres, rail stations and airports, heating should not be set above 19C and air conditioning should not be set below 27C. Doors will need to be closed so as not to waste energy, and lights in shop windows must be switched off after 10pm.
The premises in question will be required to display signs or screens that explain the energy-saving initiatives.