welcome to the site!

no, u cant house them together for numerious reasons. if one gets sick, tye other could, culd stress eachother out, you dont know whos poop is whos.

if you go to wlamart or another retail store you can pick up a digital indoor/outdoor thermometer/hygrometer for $20. just put the probe under your wamr hide, and the unit on your cold side and you have everything set up!