linzatx...
Welcome to iRV2!!

You will find all sorts of friendly & knowledgeable RV owners here willing to help any way they can.

You may also visit
the Damon Forum and ask for Karma while you are there.
You don't say what year your Damon is-but I don't think that will matter. Any coach we have ever owned had at least one thermostat on the wall. On the bottom of those thermostat is a switch that you move to turn it on or off. Once you have it on you will then move the little slider on the right side (or on the top)up to your desired temperature. Oh- one other thing - you better make sure you have propane in your propane tank and that the propane is turned on.
Good Luck on your trip tomorrow and have a great Christmas.

MM
PS... You may want to mention what year it is- so others may share any concerns or problems they have had with theirs.