I run a warm terrarium with annual range of 60-85, daily range around 15F. In winter I need to add heat with heat pads and a warm water waterfall with air blowing over it. In summer I use a aquarium chiller to chill the waterfall with air blowing over it. Indoor temp in winter is around 52 but the terrarium is right next to a big window to the outside (single pane) and we go down to 30s. In summer it gets well over 100, occasionally over 110, indoors easily up to 95. So both cooling and heating are necessary.
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