Heating Mats for indoor use

[cbuchman]

I have a wonderful sun room for my orchids when they're not outside in the summer (I'll post pictures when I get everything inside). It is attached to the house and runs off the forced hot air heat in the house. I have a fountain to help with humidify. The temp in the winter ranges from a low of 55 F at night to 68 F high during a sunny day.

I have a few orchids that need slightly higher temps and a few experiments in S/H and so I am looking to purchase a seedling heating mat(s). I have a couple of small table top greenhouses and planed to put the mat under at least one of them to contain the humidity. I was thinking of using a simple electrical timer to turn on and off (I'll need to see how much/little it needs to be on) or do I need to but a temp controller for an additional $25

Any suggestion on the mat or set up? I've found several seedling mats on Amazon for $20- $60 depending on size. All recommendations or suggestions gratefully appreciated!

Thanks in advance!