Firstly hello everyone! So a little about me I have loved snakes since my brother in law bought a corn snake and royal many many years ago and I helped him with them (so I am not a total newbie). Unfortunately, my wife is petrified of snakes so I wasn't allowed one of my own haha. Anyway she has come round (after 17 years) I set up my first vivarium for a royal a few days ago as a hobby between myself and my 11 year old daughter. I have a heat mat at the warm end obviously with a thermostat. The vivarium is wood and is 36 long X 14 deep (will be moving to a 4 ft). Temp at the warm end is 32c or 90f so that's fine however the cold end is 20/22c or 68/72f. Obviously the cold end is below what it should be. The shop where I bought the viv/snake said this is ok as the snake will just spend a little less time in the cold end however I am still a bit worried. What could I do to increase the cold end slightly? I was thinking another heat mat/ thermostat obviously set to 25c or 77f? Also as I am using heat mats I have noticed that the ambient air temp is about 20/22c or 68/72f Thanks