Besides cooling your home, an air conditioner eliminates moisture from the air to reduce the amount of humidity inside your home. This excess condensed water is taken out of the AC unit via the drain pipe and put on the ground outside. If you believe there is an issue with the functionality of your AC, have it inspected by a Rochester air conditioning professional.

Over time, mold, mildew, and algae build up in the drain line and create a clog, making water back up and overflow inside the AC system. To stop this from occurring, put a cup of bleach in the opening in the drain line in the AC system to kill any allergens and mold that has developed in the pipe.

If the condensation line is blocked, you will have to use a special pump or shop vac to get rid of the clog.

How to Clear Air Conditioner Drain Line

Rochester NY HVAC Clear Your Air Conditioner Drain Line

A clogged condensation line


  • A stiff, thin wire brush
  • A dry/wet vacuum
  • A stiff, thin wire brush
  • Bleach
  • Rubber gloves
  • Duct tape



  • Cut off the power to your HVAC system. You must always shut your HVAC off before you clean it.
  • Look for your AC drain line. AC drain lines are usually outside, close to the condenser unit.
  • Put the thin, stiff brush into the end of the drain line. This could clear any clogs situated near the drain line end. In most instances, the AC drain line clog will be further down, and you’ll have to do a little more work.
  • Attach the end of your vacuum to the end of the drain line. Seal it tightly with duct tape. Turn the vacuum on to get out any debris and clear the clog.
  • After you’ve run the vacuum for a couple of minutes, remove the vac and go indoors. Full drain pain? Just vacuum it and clean with soap afterward.
  • Find the vent tee. This is a pipe fitting that links your drainage tray to the AC drain line. Take off the PVC cap.
  • Poke that thin, stiff wire brush through this end to quickly clean out any reachable clogs.

Keeping the drain line clear is important if you want to keep your air conditioner healthy and not have any furnace issues down the road.