Hi all,
I basically gave up and took another route. I want to trigger an evaporative cooling pump for HVAC when certain conditions are met: the AC is running the compressor, the humidity is below a certain amount, temp above a certain amount, wind speed below a certain amount. Originally I tried to use the Honeywell plugin to check the HVAC status, but this has proven to be completely unreliable, it simply does not update properly and the API's means to determine if the compressor call is on is is simply if the set point is lower than actual temp.
So what I did was use a Zwave switch that gets triggered by the environmental conditions and then I just used a 24VAC low-coil current relay fed by themrostat wires that drive the contactor outside to switch the output of the switch into the pump. So, for the evaporative cooling pump to be on, it gets the environmental info from zwave which then issues an on/off to the Zwave switch and then the 120VAC from there goes into a relay triggered by the 24VAC from the outside unit.
I actually like this better because it's a fail-safe... the pump won't go on if the compressor is off, and if Zwave gets messed up somehow, the pump will be gated by the compressor being on.