Why it matters on your quote
Air conditioners and heat pumps pull water out of the air while cooling, and that water drains away through a condensate line. If the line clogs, water can overflow into a ceiling, attic or closet.
The International Residential Code calls for a water-level detection device that shuts off the equipment where a blocked drain could cause damage, for example in an auxiliary pan under an attic unit. A new drain line and switch are easy to leave off a quote.