I use to keep newts for the exact same reason, I had good luck keeping them in the basement (was the same temperature all year). What are your plans for substrate? I had smooth gravel and river stones in mine because I had tried to mimic a stream in a 20L. If I find any old pictures I'll definitely share them.
-20H Saltwater Reef with 2 perc. clownfish (corals coming soon)
-10 gallon shallow freshwater pond with 5 "Triple Red" Apistogramma cacatuoides, 4 Panda cory cats, 1 clown pleco. 1 big snail and a mess of plants.
-5 gallon cube cycling with a half-moon betta and male "Triple Red" Apistogramma cacatuoides
In real life I brew beer and mess around with yeast and hop genetics