JUST WHAT I WANTED!!  It is run by a thermostat so goes off and on by itself.  My mobile home has bedrooms at both ends so with my old window unit at one end and this 6000 unit btu on the end with the brutal NC hot sun on it I kept my light bill will usually stay under $100 a month.  When I am sleeping one unit stays off with door closed and when I am up and busy the other one stays off with the door shut.  GOOD deal!!