aecchalet, If you are asking can I LIMIT the minimum value with PLEG, then the answer is No. However, if you are trying to set the Cool Setpoint (where the a/c unit would start cooling) then Yes. I find the terminology a bit confusing sometimes with these thermostats, as there are Cool & Heat sepoints for each of the 3 modes (Heat, Cool & AutoChangeOver) so be certain you are setting the correct parameter AND that the thermostat is in the correct Mode. This is not always clearly evident when reviewing your PLEG reports. The action will say "SetCurrentSetpoint" but it will not specify which mode it is. See attached screen shot.
To be more clear on this; if the thermostat is in Auto Change Over MODE and you set the Cooling setpoint, NOTHING will happen. The thermostat must be in Cool Mode AND then you set the desired temperature setpoint. So in PLEG there will always be two actions associated with any temperature programming. 1 Set or confirm the MODE, 2 Set the setpoint.
In my setup I use the outside temp to determine which mode both thermostats are in at any giver time. Below a set number puts them in Heat Mode, above a set number is Cooling. Anything between those two parameters is AutoChangeOver Mode. I use a very narrow ACO window of just 5 degrees. Here in Florida its either hot or cold so my system does not stay in ACO for very long. Once in either Heat or Cool mode I set the SetPoints by a generic schedule of Morning, Daytime, Evening and Sleeping. Each has an associated Heat and Cool value which are stored and displayed on my devices page using MultiString. PLEG looks up these values and passes it into the SetPoint action when the condition is true. This allows us to set up a routine schedule AND modify it without going into PLEG (making it wife friendly and visually easy to see on Vera). Of course these values could just as easily be set directly in PLEG and skip the MultiString variables altogether, but I like being able to see what the values are as the months go by (sometimes I forget) :<(
I hope this helps and I am willing to share my HVAC PLEG Logic report if you need more assistance.