The heat is transported as high pressure water, at a temperature way higher than 100°C. Very common, used also in many towns.
The heat comes from power plants, waste combustion etc. Even nuclear power has been used.
The AC is a new system: It's simply seawater circulated and then dropped back into the sea. (Huge quantities are needed)
Quad glazing is still experimental. Any sizeable window becomes too heavy for the frame. Gas filled triple glazing seems to be favoured. (The Germans build houses without heating and Swedish builders are trying to copy this.)
Gas is rarely used here. Gas cookers are replaced as flats are rewired. (There has been a massive drive to rewire in the past decade)
