TrolMaster - Hydro-X Thermostat Station (cool only conventional HVAC)The TS 1 thermostat stations is designed to replace a thermostat connected to a conventional cool only HVAC unit. The TS 1 is wired to the HVAC system using the same low voltage thermostat cable, and has the standard color coded wiring as most thermostats. The Hydro x allows separate Day and Night settings for each of up to (4) TS modules so multiple HVAC systems can be controlled by a single Hydro X system. Features: LCD Display, Easy Operation