It depends on the size and type of enclosure that you have.
I have a 20 gallon long tank with a 100w CHE and my Herpstat has no trouble keeping 82 degrees ambient temps. I keep my home thermostat set at 68 during the winter and it hasn’t got down that cold yet this year but I think it will be fine. If not, I’ll get a 150w CHE.
Like Crowfingers said, a good thermostat should be able to handle a 100 watt CHE, no problem.
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