every stat has a range that it activates in. Your has 2 ranges. Assuming
for a minute that you have a 2 stage gas furnance one stage would come on
and start to heat. The stat and or the unit itself would expect to see the
temp rise with in a period of time. If that does not happen then the second
stage would kick in to bring the temp to the set point.
Differential is the dead band of stat. Set point of 70 F, dead band of 2
Differential are settable to some extent depending on your application and
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