Certainly not an HVAC guy but I have seen that before but usually with older simpler thermostats that could adjust temperature but nothing else. The switch was just used to turn on the fan to circulate the air. Perhaps the heat and a/c went in at different times and they just evolved to newer thermostats using the existing signal wires with fewer conductors. If there are enough conductors or you can fish new ones, you could likely convert one thermostat to do all and abandon the rest. No doubt smarter folks than I will be along.
light switch for HVAC in living room
In my new house, the previous owners have set up 2 separate thermostats. One controls the heat and one the AC. Both are the same model/brand and they both have a switch (see picture) to toggle from Cool/Off/Heat. However, they are wired where one is solely for AC and the other Heat. Why would they not be all on 1 ? Both thermostats are in the living room but on opposite ends. it a very small 1 level house (1,100 sq feet)
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