If you're willing to pay, then buy a Herpstat by Spyder Robotics. They are the best thermostats you can get. The base model costs $99.
Hydrofarms work ok if you're on a budget, but I will always recommend the Herpstat if you're willing to pay for it. What you pay is what you get.
I have a Hydrofarm on my quarantine rack, but a Herpstat on my main enclosures.
The Hydrofarm is an On/Off type thermostat where it turns on, if the temp drops below the set temp and turns off when it reaches the set temp. It has about a 3 degree temp swing. So basically it gets hot-cool-hot-cool.
Herpstats are proportional thermostats where it keeps the temp constant by regulating how much power goes into the heating element itself. What I like the best about Herpstats is that they turn into the Off position if they malfunction. Most T-stats do not do that and leave their heat mats to turn on full blast, which is a potential hazard. Higher models also have other safety functions.
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