TS-1 Thermostat Stations are designed to replace a thermostat connected to a conventional cooling-only HVAC unit. The TS-1 connects to the HVAC system using the same low voltage thermostat wire, and has the standard color-coded wiring as most thermostats. The Hydro-x allows for independent day and night settings for each of the (4) TS modules, so a single Hydro-X system can control multiple HVAC systems.