LP gas valve handles, on or off?

[ED GARDELS]

Can someone tell me about the valve handles, please. If they(handle)
are parallel to the gas lines, is that off or on? I suspect on. I
asked the previous owner if they worked. He said in the 13 years he
owned it he never used any thing but heat strips on the ac units, no
electric or gas.
Also, on my dash there is a LP HEAT switch. I just found out about
two weeks ago that I have to have that sw on to get lp on the fridg.
Do the electric heaters keep the coach warm?We havent used it in the
winter yet.
thanks for the help
Ed Gardels 89sp
Arlington Texas