I use twenty longs in a cold climate myself. I put heavy acrylic across more then two thirds of the top of my tanks. And use an infrared 75 watt bulb on a dimmmer for my only heat source. I have no trouble keeping a 88/90 hot spot and a 82/80 cool end. Sometimes you have to cover over most the top and add insulation to the outside when dealing with tanks. I’m sure others will chime in. Some even get small space heaters to help boost the rooms temperature. Good luck.
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