I use a Herpstat Pro.
Non-proportional thermostats switch on heaters or devices on at full power and then cut power off completely once it reaches your set temperature.
Proportional thermostats adjust the amount of power so that your device will almost always be on, just at a very low level to maintain your temps.
Proportional stats/proportional mode on the Herpstats are better for your heating/cooling devices.
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