Your coach pshould have a rear heater under the bed. This is heated while underway by coolant heated by the engine. The switch on the dash turns the rear heat off and on. It really does help, if it is working properly. Mpst have an electric blower which also comes on when the dash switch is turned on. If your coach has the Primus heating system, there are additional heating options for the rear.
As near as I can tell, use of either of the On positions on the battery merge switch does exactly the same thing. My manual says to use either On position to merge the coach batteries with the chassis batteries adn doesn't differentiate between the two On positions.
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