My guest sets the thermostat to 26 degrees, now what?

The energy costs of your holiday rental are separate from what the guest pays, so heating to 26 degrees with an open window is on your bill. House rules or a fixed surcharge usually don't work, because the guest doesn't feel the cost of their behavior. Staywatt makes consumption and its costs visible to the guest during their stay via a pre-purchased credit, which causes them to adjust their behavior without you having to enforce anything. With one property and limited rentals, a simple agreement is often enough.