In the summer, instead of air conditioning, we have cooled floors.

  • They are silent.
  • They don’t smell or cause cold draughts.
  • And they are also more energy-efficient – if the thermostat is correctly adjusted.

This photo shows the correct setting for the thermostats in the summer. Most important: it’s set to COOL! And the desired temperature is in the range 20C-22C.

Please don’t adjust the thermostats in the summer!

  • If you accidentally set it to HEAT, it will go mad because the system doesn’t understand what to do. (The result is that it will use a ton of energy but it won’t get warmer, it will just stay the same.)
  • If you set the temperature too low, below 20C, the floor will become so cold that you will cause condensation. That makes the floors wet! And it uses a ton of energy! And they take a very very long time to recover!
  • The system is very slow to change the temperature, anyway. It takes a few days.
  • We have learned over the years, that the best advice is, please, don’t touch the thermostats, thank you.


Our geothermal cooling is in fact a geothermal heating system set to work in reverse.

Ventilating the bedrooms

  • Night: Open
  • Daytime: Closed

Daytime is not the time to ventilate. You don’t want all that hot air inside the bedroom. When the sun shines and the air is hot, you want to keep the heat outside. That means, close the bedroom shutters and windows, and keep them closed all day.

After dark, the air outside begins to cool down. Now is the time to open the windows and shutters in the bedrooms and allow the cool air to ventilate. But, be wise, don’t attract mosquitos. They are attracted by light. Open your bedroom windows and shutters with the lights turned off and keep the lights off when the windows are open.