Noisier than usual, or you just finally noticed that the thing is pretty darn loud when running and are wondering about it? If so, thats normal. When I’m in a typical RV park this time of year, with lots of close neoghbors, I hear propane furnaces cycling on and off all night all around me (light sleeper). They also seem to exhaust more heat than they retain in the coach - some day they’ll start producing more efficient RV appliances.