Infocus IN24 outdoor use (cold weather)

Hey Guys, quick question, i search and search and cannot find a unit that can house my projector to keep it warm when off for outdoor use in winter. Anyone have any ideas? Basically I want to setup a inflatable screen on my lawn during christmas season and play holiday movies as people drive by, when the projector is on, it will be plenty warm but I am worried about the day time when it is off and it's 10 degrees on a winter day here in NY, I was going to build a box with a small heater in it but there has to be a better way. Curious to hear any good ideas, suggestions or links to something I can just buy for this, Thanks guys!