If you are using 2 UTH's then you will need a way to control them so either 2 thermostats or at least 2 dimmers. Very few pet stores carry t-stats, but they are readily available online ranging in price from $25- $200. I use the Ranco T-stats, which are mid priced ($80.00)
http://www.reptilebasics.com/Thermostats-p-1-c-250.html
As for the CHE. Unless your house temp is below 75-76deg you shouldn't need it. But if you need it, you can always get one of those digital light timers from Wal-mart and set the CHE to cycle on and off...