The LVR system may be thermostatically controlled. If you have a thermostat already, you may not need to purchase another. Just make sure it is up to code and can handle a 3 wire system. Many older motors were a 2 wire system.

These Schaefer greenhouse thermostats are for temperature control. They are made with a code approved moisture-resistant enclosure. They are the finest and most reliable automatic thermostats available. They are designed especially for building ventilation systems. They have a wide temperature range with narrow operating differential.