Central air conditioners produce something other than cool comfort: water, lots of it. Because dry air holds less heat energy, humidity extraction is a critical part of an efficient air conditioning process. When the air conditioner blower pulls warm household air through the frigid passages of the evaporator coil, the cooling effect causes water vapor to condense out of the air rapidly. Condensation drips down into a collector pan under the coil and is conveyed through a drain line to a household sewer connection. Things that might go wrong in the condensate drain system include damaging leaks, bad air quality, toxic mold growth, and even a complete air conditioner shutdown. As seen below, a condensate line backup caused water damage through walls and into carpet and padding. Luckily, this home in Mount Laurel New Jersey didn’t sustain major damage prior to it being discovered.