Not sure how to ask this question in an educated form so here goes:

When a heat pump goes into defrost mode:

a- Is this some form of going into A/C mode?

b- Does it produce condensation that would drip from the air handler thru the drain pipe?

I'm the dude that has the water sounding drip drip drip in the wall. The copper lines are adjacent to the condensation drip pipe.

Thanks for allowing HO's to ask questions.