Hi from Cyprus, does anybody knows how to put an extra charge for the air conditioning, please if anyone knows to help me out because summer is here and I have to be prepared.
You with need to build it into your nightly charge (and then refund if it is not used). Or you agree a daily rate up front with guests BEFORE they confirm and pay for the booking.
You need to think about how you will know whether aircon has been used or not - or if it is possible, for example, to switch off the system for guests who say they do not wish to use it.
i would suggest charging in advance rather than trying to chase guests afterwards for payment.