Advice on growing in a terrarium

[Rhonda Svoboda]

As some you know, I am trying to raise both the heat and humidity for my Phal.'s and a Phap. Space heaters are out due to cost and drying out the plants.
I can't afford most of the high end, or larger, terrariums.
I know there are a lot of very smart orchid growers on this sight that are very talented at improvising or inventing ways to grow orchids.
So I am asking for your ideas and creations, please.