Roaland, hope this helps some. I'm a professional cage builder , I live in an older house with drafty windows and my house temp stays around 68 -70 in the winter. I built my cages out of 3/4" plywood ( key factor ) I am using sliding glass doors in the front that I use 1/8" rubber bumpers as stops. No other air vents. Doors are not air tight so this provides enough fresh air. My cages are 2'×2'×4' same as what you are wanting. When I built my cage I raised the floor 1" to allow for a UTH on an inlay piece of glass. I am using a PH3 65 watt panel from pro products. ( I believe I paid about close to $100.00 with shipping ) I am running a herp stat 4 as my thermostat. ( I have a triple stack of cages so each cage gets 1 probe and the last output I use to control my led lights. ) for a single cage a herp stat 2 would work fine ( leave you an output to play with ) my set ups have been working flawlessly for past 2 years with just the RHP. I did not need to add the uth. Here are a few key points when using RHP..... things happen very slowly with them. Don't expect to plug them in and get immediate results. It takes days for the Temps to stabilize and to bring the 3/4" cage material up to even temps. Be patient! Also invest in a quality panel. Remember this is an investment and good panels are a one time buy. They will last 50 years or so. Plus if you are used to running ceramic heaters on full ( 100 watts × 24 hours ) you will see a HUGE saving on electric bill with 65 watt panel on proportional setting on your thermostat. ( probably paying for the panel with the saving in a year or two ) mounting the thermostat probe is controversial but can be mounted the way KMG did or closer to the floor. Both ways work the same in reality it's just a matter of what Temps you want to see on your display. ( dialing in temps can be tricky and is another topic ) ask and most members can help with that. So what you seek to do is possible it's just a matter of "taking the leap " so to say. Also humidity stays much better in this style cage vs open glass "fish tanks " I spray once a day or so to stay in the 50-60 % range.