“Our biggest service call we get at any time of the year is drain line clogs. So one of the things that’s very important is maintaining those drains.”
Jason Healy, Operations Manager
Why Florida drain lines clog
Your indoor unit holds the evaporator coil, which captures moisture from the air as it cools. That water drains out through a PVC pipe to the outside. With Florida humidity, your system moves a lot of water, and over time debris builds up inside the line until it backs up.
Signs your drain line is clogging
| What you notice | Urgency | What to do |
|---|---|---|
| Water pooling around the indoor unit | Now | Turn the AC off and call. |
| AC shuts off on its own and won’t restart | Now | A safety float switch may have tripped. Call. |
| Little or no water dripping outside the drain pipe while cooling | Soon | The line may be blocked. Try the vinegar flush, then call. |
| Musty smell near the indoor unit | Soon | Have the drain and pan checked. |
The vinegar flush: how to do it
Find the drain access
Look for the PVC drain line near your indoor unit, usually with a capped access point. Ask your technician to show you on your next visit.
Pour about 8 ounces of vinegar
Plain white vinegar helps break up buildup in the line.
Follow with about a gallon of warm water
That flushes the debris through and out to the exterior drain.
“Customers are instructed that in between those visits, they add vinegar into the drain, about 8 ounces, and then follow it up with about a gallon of warm water. That helps flush the drain line through, getting any additional debris out.”
Jason Healy
What we do on a maintenance visit
A home flush helps, but it isn’t a full safeguard. On every maintenance visit, our technicians clear the line properly.
“We make sure we flush them through well. We use nitrogen and we use a shop vac from the outside, so they don’t have that problem in the middle of the night when the drain backs up and clogs. If you have family over or a birthday party and everybody’s sweating, that’s never fun.”
Jason Healy
Float switches, the safety devices in your condensate drain, also fail from time to time. Our technicians carry them on the truck, so most can be replaced on the first visit.
Call us if
- Water is pooling around your indoor unit or ceiling
- Your AC has shut off and won’t come back on
- The vinegar flush doesn’t get water flowing outside
Keep your drain clear year-round
Maintenance members get a full drain flush twice a year.
Frequently asked questions
How do I unclog my AC drain line with vinegar?
Pour about 8 ounces of white vinegar into the drain line access, then follow it with about a gallon of warm water to flush it through.
How often should I flush my AC drain line?
Between your twice-yearly maintenance visits. In Florida’s humidity, doing it regularly helps prevent clogs.
Why did my AC shut off with water around it?
A clogged drain can trip the float switch, a safety device that shuts the AC off to prevent overflow. Turn it off and call a technician.
Is a clogged drain line an emergency?
If water is leaking inside, yes. Turn the system off and call to prevent water damage.
