"John Wilson" wrote in message
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Google suggests that PLC means Programmable Logic Controller, so I assume
this is what you refer to.

John.

A quick search found this one, T1000MD888+ for ~$200.
http://www.tri-plc.com/t100md.htm There are many others like this one out
there. This could accept the inputs from the humidistat, thermostat and
even an outdoor thermometer and then using the outputs, control the
ventilator and furnace fan. BUT, you'd need to program it from the ground
up. This may or may not be a problem for you. If you learn how to program
well, you could set this thing up to be the ultimate
thermo-humidi-ventilatorstat.

Shawn