Extended season use of TT near freezing temperatures

A couple of years ago we were planning on making a two week trip to Florida at Christmas. I put a 100 watt light bulb in the wet bay which has the hookups, water pump, dump valves and set the heat on 45 degrees. I also opened all the bottom cabinet doors. We had several nights that went down into the low 20's but would warm in the 30's and 40's during the day. We had no problems and when our trip came my propane level had barely moved so I know the heat ran very little.