What do you do about guests who run the air conditioning continuously?

Putting up a note or locking a thermostat usually doesn't work and doesn't feel hospitable. The real problem is that guests don't see their electricity consumption and therefore don't see the costs either. With a Staywatt metering module, the guest buys electricity in advance and sees on his phone exactly how much credit he has left. That way the air conditioning is allowed, but you no longer pay the bill for someone else's choice. For accommodations with limited rentals or low additional costs, this system is not necessarily worth the trouble.