Not a good plan mate.
Evaps work well up to about 45 degrees of dew point. Most older evap/ac
systems do not have automatic dampers. So the change over is manual.
My old house had the two stats side by side. I made sure to turn the a/c off
when I used the evap.
Just because you have one damper on the cooler does not mean that there is
not a slide or manual damper to prevent the cooler from pressuring the coil
in the a/c. Putting all of that moist air on the coil in time will have a
negative effect on the performance of the a/c.
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