@Dev4 I agree, it's in my house rules, where I just confess that it's a personal pet peeve, and since they're in a guest house in my backyard I can easily see if they leave the lights burning.
This is what the rule says:
LIGHTS & UTILITY USAGE: Ok, most of all these rules are just common sense but this one is my one personal pet peeve. Please, please, please would you look around and switch off the lights? If you are going out for the day, or going to bed, please take the time to check the various lamps and switches and turn out the lights indoors and out. By all means, leave on the porch light or the lamp by the door if you'll be coming back after dark, but don't make me look up the hill and see lights burning in a barn that is empty or where everyone is asleep. Thank you!! Also, the AC system is quite efficient so if you'd consider turning it up by a few degrees if you're going out for more than a quick errand then we, the Texas electric grid and the planet thank you.
This is a new write up so it remains to be seen how it will work. However, it's so specific that I will be more likely to message guests if I see lights on unattended and remind them to shut them off.
Kelly, Real Texas Barn
www.airbnb.com/rooms/15208027