Dual Thermostat

OK, here’s something I have not seen before - Any insight as to why this would be would be appreciated.

Thanks

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Thermostat and humidistat.

Only one is a thermostat

The top one looks like a line voltage thermostat. I do not think that you would want 80% humidity in the home.

Thanks, Pointed me to further research - It appears to be something that some people use to control humidity when they are not around without having to run the AC at lower temperatures.

Humidistat possibly for fan in crawl space.

http://www.supplyhouse.com/Honeywell-H46C1166-Dehumidistat-24-120-240-VAC-White?gclid=Cj0KEQjw75yxBRD78uqEnuG-5vcBEiQAQbaxSLu92RE2yJtT5QgygSVPwprZFOYMe78Nx3adDglrQKAaAr4k8P8HAQ

Top one is a dehumidistat.