I suggest that you get this thermometer fromn walmart, it costs $12 and is usually by the lightbulbs
I recommend Herpstat thermostats.
http://spyderrobotics.com/
if you re on a tight budget, the hydrofarm is ok, but should be replace with a better thermostat when possible
http://www.amazon.com/Hydrofarm-MTPR.../dp/B000NZZG3S
They don't need UVB, but it won't bother them. my cages just have regular Fluorescent tubes in them.
for the Carpet, I would use a radiant heat panel, they work really well especially for snakes that like to stay up off the floor of the cage.
Here is a good place to get them: (also a good place to get flexwatt (heat tape) )
http://www.reptilebasics.com/rbi-radiant-heat-panels
As for perches for the carpet, you have 2 options. I built this for my carpet, it is made from 1/2" diameter PVC pipes and fittings. took all of 10 minutes to make and costed under $20
Or you could build a mount into the side of your cage like so:
You can see that they used a "v" shaped piece of plastic with a notch to support a horizontal rod (made of Delrin but PVC pipe would also work)