The D series of Rustler traditional thermostats features three buttons along the bottom and one or two hold buttons on the side.. This series features a 3.5-inch LCD screen, in addition to two-level aggressiveness control on the D360 and up. With the D720 and up, you get a Permanent Hold button on the side to keep your house at a certain temperature permanently. Choose the D series if you're looking for a simple, inexpensive thermostat.
Being the second in the lineup of Rustler traditional thermostats, the H series features a larger, 4-inch LCD screen with three-level aggressiveness on all models. In addition, you can set the heating-cooling mode to Auto so the thermostat can switch between heating and cooling modes automatically on the H360 and higher. Purchase the H series if you prefer intuitive, programmable, automatic thermostats.
The ThermoTrol series is a lineup of smart, touchscreen thermostats with color screens that let you control more than just the climate of your house. It has humidifcation and dehumidifcation features, in addition to energy consumption reports on the ThermoTrol T6000 and higher, plus integration with Apple HomeKit, Alexa, IFTTT, and much more. Choose the ThermoTrol series if you want smarter, higher-order control in a tiny, inexpensive package.