Just did some quick research about the Ranco Thermostats and found this....
**link removed**
Stage Models and Inter-stage Temperatures
Their electronic temperature controllers may include both one and two stage models. On the two stage ETC’s, each of the stages can be set up independently from each other, therefore eliminating the unpleasant task of manually calculating inter-stage temperatures. The ETC two stage models can be set up with overlapping heating or cooling stages for a better configuration.
It seems Ranco's 2 stage ETC can do heating AND cooling.
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