The dehumidifier in the pool room removes evaporated water from the air of the pool room in order to prevent mold and rot. However, it pulls a lot of power and there are simple ways to avoid that it runs unnecessarily
Sweep the floors after you finish a pool session.
If all the water is left on the floor, the dehumidifier has to run for hours before it has all evaporated
Close the pool cover whenever you're not using the pool
When the pool cover is open, the water in the pool continuously evaporates, and all that moisture needs to be removed by the dehumidifier
The faucet in the kitchen has the option to dispense boiling water, which is much nicer and more energy efficient than to boil it in a pot or in a kettle. Just pull down twice in rapid succession and twist. Be careful not to have your arm below the faucet when you do this.
The terrace heaters draw 2000W of power each. That can add up if you forget to turn them off.