How much of your hot water needs can the sun cover in summer?
In summer, how much electricity do you use from the grid to heat your water by combining a thermodynamic water heater and solar panels?
How many thefts and burglaries were recorded in Belgium per 100,000 inhabitants between 2017 and 2019?
With an air-to-air heat pump, what temperature could you get inside if it's 40 °C outside?