So you see a water puddle on the front sidewalk of your home and ask yourself, “Why is water leaking out the front doorway of my Dallas home?” It’s probably coming from the condensation line of your air conditioning unit(s). It’s possible that the coil froze and you shut off your unit, now the water is flowing out the condensation line.
Or, the main drain is clogged and the secondary line is dripping. Condensate lines are what drain water off from your evaporator coil from your air conditioning unit. Condensate lines can make up to 8 to 10 gallons per day and sometimes high efficient units will get over 20 gallons per day on hot humid days.
As air flows over the evaporator coil the particulate from molds, dirt, spores, and things in the air will gather in the condensate line and cause Moulden Algaen things to grow. This algae grows and causes a slime of algae to grow in the evaporator pan and in the drain line. Over time this will clog the line.
This is why sometimes you see water dripping from over a window or a front doorway in which is telling you that the main drain is clogged up and the secondary line is dripping out so you can know that a drain has to be cleared. It is city code for the water to go over a door, doorway, or a window that is looked at so that you know that the line is clogged up so you and get it cleared. (A code that actually makes sense.)
The algae can be battled by pouring bleach down the condensate line. Note: This is to be done with care as any spillage can cause other damages. Another way to fight the clogged line problem is by using chemicals made for drain pan that are added to kill algae by slowly dissolving it. Beyond that, if you are having major problem; an HVAC technician or plumber will need to look further to cure the problem.