How much does it cost to clean an AC drain line?
Updated
Short answer
Cleaning the AC condensate drain line yourself costs $0 to $10, which is a bottle of vinegar. Having a technician clear a clogged line costs $75 to $250. The gap between those numbers is the whole argument for the monthly cup of vinegar: a clean line never needs the service call, and a clogged one needs it on the hottest day of the year.
Cost breakdown
| Item | DIY | Pro |
|---|---|---|
| Materials | $0 to $10 | included |
| Tools you may need to buy | none | included |
| Labor | your time | $75 to $250 |
| Total | $0 to $10 | $75 to $250 |
The DIY cost is the vinegar. A wet/dry vacuum, if you don't own one, is the only tool the job might need, and only for a line that's already clogged.
What drives the cost
- Prevention or repair. The vinegar flush is maintenance and costs almost nothing. The service call is for a clog, which is what the flush prevents.
- How bad the clog is. A line that clears with a vacuum from the outside end is a quick visit. One packed solid along its length, or one that has to be cut and replaced, takes longer.
- What the overflow damaged. If water came through a ceiling before the clog was found, the drain line is the small part of the bill.
- Where the unit is. An air handler in an attic or a tight closet adds time to any service call.
- Timing. A clogged line usually shows up at the height of summer, when service calls carry a premium and a wait.
DIY vs. pro
This is the easiest job on the HVAC list and the one with the best return. How often to clean the AC drain line is every 1 to 3 months during cooling season, and each time is 10 to 15 minutes and a cup of vinegar poured into the access opening. There's nothing to take apart.
Call a pro when the line is fully clogged and the vacuum from the outside end won't clear it, when water has already overflowed, or when you can't reach the unit safely. The $75 to $250 visit is reasonable for a clog. Paying it more than once means the monthly flush isn't happening.
FAQ
How much does it cost to unclog an AC drain line?
$75 to $250 for a technician to clear it. Preventing the clog with a cup of vinegar every month or so costs $0 to $10.
Can I clean the AC drain line myself?
Yes. Pour a cup of white vinegar into the line's access opening every 1 to 3 months during cooling season. A clogged line can often be cleared with a wet/dry vacuum at the outside end.
Why is my AC drain line clogged?
Mold and algae grow in the dark, wet pipe and build into a slimy plug. Regular vinegar keeps them from getting thick enough to block it.
Is a clogged AC drain line an emergency?
It becomes one when the pan overflows into a ceiling or the float switch shuts the AC off in a heat wave. Clearing it the day you notice standing water in the pan is the cheap outcome.