thank you Mike - this is THE solution - the help center ignores it !
another question I hope you can answer : how can I bill the heating according what the customer uses : energy is more and more expensive ! somes customer want 25°C opening the windows, others are reasonable ! -we have individual meter which gives the daily consumption -
@Philippe277 sorry but no solution for the heating. We suffer from thermostats set at 25 (once 30) degrees. Luckily we burn wood pellets so it only costs about 3.5p/kWhr and the cost can just be amortised across all stays as it is less than £5 per day.