@Alexandra199 your questions are most apt in the present "climate", and whatever any of us do, unless we aren't dependant upon any form of energy, we will all be paying extra for our Gas, Electricity, and Oil for a long long time, so we will need to make certain we won't be out of pocket at the end of the day!
I don't know whether everyone does what we do, but all of our outgoings in the running of our business are built into the amount we charge per night, so whenever costs/charges to us increase, our Guests will contribute towards them BUT our caveat is that we don't restrict our Guests to any particular temperature, other than that we set a maximum on our Hive thermostat dependant upon the ambient temperature, but do let Guests' know that if they need to, they can increase the heating (being Hive I put a lock on the system at 24°C, so get notified on the app when the maximum is reached).
Because we have a Gas Combi boiler that heats the water for washing, as well as for the shower, and as our range cooker is dual-fuel, there isn't any way to restrict usage of any of those items, any more than is there a way for the amount of water to be restricted.
Fortunately our cottage is very well insulated, so it doesn't take long to get warm, whilst it also retains the heat, both of which are bonuses; for our Guests' especially, as it keeps the place nice and snug!
We have been thinking ahead however, as whilst the price of gas has just been increased, it's due to go up again - in October,
I'm led to believe - by another 300% - which would really put the cat among the pigeons - so with that in mind, perhaps all thought should be concentrated on what to install instead of Gas?
Ok, so I have probably wandered off the topic somewhat, but in another way I am saying that we ain't seen nuffin yet, and that whatever you do and whichever way you get out of it, "Gas" is not the future post 2025 (Hydrogen is, but that's another story altogether!)