As suggested, determine the brand and type of all your appliances (water heater, furnace, air conditioning, refridgerator, etc) and to the the specific sites and download the proper manuals for them. Most "camper" manuals are so generic that they don't help much, if at all. I had one once that said things like "when outside temps rise above xx degrees, turn on the A/C to cool the unit down", or, "to keep food cool, the fridge must be set to the on position". Well, DUH???