So I've just finished "calibrating" my ecobee and a pair of Sonoff temperature and humidity sensors in order to test your dewpoint control method this summer. I was shocked that the ecobee temperature seemed to be off by 2.0 deg. F. and the relative humidity was off by 8%. The $8 Sonoff sensors were more accurate out-of-the-box than the $200 ecobee. I think that at least part of the error is due to internal heat dissipation from the electronics.
Anyway, your previous comments indicate you use a 1.5 degree deadband on the dewpoint value but the screenshot of your Node Red flow seems to show 2.5 degrees. Can you confirm which you've been using?
