If I have a dewpoint -20 to -40 and my temperature is set to 40 degrees and drops about 10 degrees in 15?

Question

seconds. Also has an over shoot of 5 to 7 degrees. What would be my humdity and condensation level or would this cause humidity or condensation? Thank you

Answer 1

Thunder Scientific manufactures a two pressure humidity generator. They provide a free web based calculator that will answer your question.  You just have to register.

EDIT: I assume Celcius but either way a dew point of -20 means that there is very little humidity. My gut read is that a 10 degree cooling from 40 to 30 degrees would not cause condensation.