Swamp cooler leaking into the house
The usual culprit is the float valve: if it sticks, water runs continuously and overflows the tray. Adjust the float arm; if that does not fix it, replace the valve or call a cooler specialist.1 Then dry any wet ceiling within 24 to 48 hours.2
Free service. Call now and we'll connect you with a local restoration company. How it works
If it is leaking now
Four steps
- 01
Shut off the cooler's water line
Turn off the supply valve on the line feeding the cooler, or the main shutoff if you cannot find it.3 Then turn off the cooler.
- 02
Photograph the ceiling and the cooler
Photos or video before you move anything help with an insurance claim.4
- 03
Check the float and the water level
The water should sit about one inch below the top of the tray and below the overflow pipe. If it is too high, adjust the float arm; if the valve sticks, it needs replacing.1
- 04
Dry the ceiling fast
The EPA's target is to dry wet materials within 24 to 48 hours.2 Wet ceiling drywall that sags should be looked at by a professional before anyone stands under it.
Why coolers leak
- A sticking float valve. If the valve sticks, the water runs continuously and overflows the tray.1
- Split seams or a rusted tray. The University of Arizona guide says to look for split seams in the casing and rusted areas in the tray, which could cause a leak.1
- A water line left connected in winter. The guide says to disconnect the cooler's water line and blow out the water to prevent freezing.1
The University of Arizona season checklist
| When | What the guide says to do |
|---|---|
| Spring start-up | Clean debris from the water pan, reconnect the water line, check the float valve and adjust the float arm if needed, then look for split seams and rusted areas in the tray.1 |
| Mid-summer | Water about one inch below the top of the tray and below the overflow pipe. Make sure the float valve is not sticking.1 |
| Fall shut-down | Drain and clean the tray, dry it and check it for cracks, coat it against rust, disconnect the water line and blow it out, then cover the cooler.1 |
A cooler can use 50 to 200 gallons of water a day, according to the same guide, so a stuck valve can put a lot of water where it should not be.1
Is it covered?
Policies differ. Triple-I says water from above and burst pipes are typically covered by homeowners policies.3 How yours treats a cooler overflow is a question for your insurer, so photograph it and call them early.4
How this works
What happens when you call
It is free to call, and calling commits you to nothing.
![A woman on the phone in her kitchen, wet towels and a bucket on the counter under a stained ceiling, a saguaro outside the window.]()
1You call
Tell them what happened and where. Have the address ready.
- 2
We connect you
A call network puts you through to an independent local restoration company that serves Tucson and is taking calls.
![A technician points to a water stain beside a ceiling vent while a homeowner listens.]()
3They assess and quote
If you want a visit, they look at the damage and quote their own price. Ask for it in writing.
We are a free referral service, not a contractor. The company that answers sets its own prices. How this service works
Want a local company to look at it?
Free to call. An independent restoration company that serves Tucson answers, and you decide what happens next.
Call (520) 795-0505Tucson Water Damage Advice is a free referral and information service, not a contractor. Calls are answered by independent local restoration companies through a pay-per-call network, and we may be paid when a call qualifies. We do not do the work and do not set prices or availability. How it works
Sources
Each numbered note on this page points here. We read every page on October 24, 2026. Where sources disagree we say so; where we could not find a source we left the claim out. We are not affiliated with any of these organizations.
- University of Arizona Cooperative Extension (Water Wise), Swamp cooler maintenance. No date shown (page copyright 2026). extension.arizona.edu/programs/cochise-county-water-wise/water-saving-tips
- U.S. EPA, A Brief Guide to Mold, Moisture and Your Home. Page updated February 18, 2026. www.epa.gov/mold/brief-guide-mold-moisture-and-your-home
- Triple-I (Insurance Information Institute), How to protect your home from water damage. No date shown (page copyright 2026). www.iii.org/article/how-to-protect-your-home-from-water-damage
- Triple-I (Insurance Information Institute), Settling insurance claims after a disaster. No date shown (page copyright 2026). www.iii.org/article/settling-insurance-claims-after-a-disaster