Swamp cooler leaking onto the roof or through the ceiling in Albuquerque

Water running off the roof or staining the ceiling around a down-duct is almost always the float or the overflow, and the first move is not a phone call, it is the shutoff valve. Close it and the emergency stops. The repair is usually $100 to $250 on top of the $150 to $350 service call, unless the pan itself has rusted through, in which case you are looking at replacing the cooler rather than repairing it.

Check this first

Shut the water supply. Follow the quarter inch copper or poly line back from the cooler. There is a valve where it leaves the house, often at a hose bib or a small saddle valve in a closet or crawlspace. Close it. The blower can keep running.
Look at where the water is. Sheeting off one corner of a roof unit points at the pan or the float. A steady stream out of a small pipe near the bottom of the cabinet is the overflow standpipe doing its job because the float has failed. Water inside the down-duct or the ceiling means it got past the pan or the curb.
Look at the stucco. A white mineral streak down the wall below the cooler means this has been happening for a while, not since yesterday. That changes what we look for.
Do not climb up to bail it. A wet flat roof with a cooler on it is one of the easier ways to fall in this trade.

What is usually wrong

What you see	Likely cause	Fix and cost
Steady overflow from the standpipe	Float set too high or stuck open	Float valve, $100 to $250
Pan full to the brim, nothing draining	Overflow tube scaled shut	Cleared or replaced, $100 to $200
Water at one seam or corner of the pan	Pan rusted or cracked	Replacement conversation
Water inside the down-duct or ceiling	Pan, curb flashing, or duct joint failed	Diagnosed on the visit
Leak only when the pump runs	Split distribution tube or loose spider	Repaired with the visit
Slow drip that started this spring	Line or fitting split by the winter freeze	Line repair, $100 to $300

All of those numbers come off the pricing page.

Why this costs more in Albuquerque than people expect

Stucco and parapets. Most of this housing stock is stucco over frame or block, and mineral-loaded cooler water running down a wall does two things: it stains, and it works into the parapet cap and the wall base. A float valve is a $100 to $250 part. Two weeks of water down a stucco wall is a painter, and if it reaches the parapet it is a roofer. The cost of waiting is not the cooler, it is everything the water touched.

Flat roofs. In Nob Hill, the University area, and much of the North Valley and South Valley, the cooler sits on a flat or low-slope roof where water does not run off, it ponds and then finds a seam. That is how a cooler leak becomes a ceiling stain twelve feet away.

The water itself. The Water Authority’s own drinking water FAQ points out that when water evaporates the dissolved minerals are left behind, and that residue is what collects on evaporative coolers over the summer. That residue is exactly what scales an overflow standpipe shut and what jams a float open. Zones across the system run from moderately hard to hard, so this is a maintenance item here, not a defect.

Water waste rules. Water Authority ordinance defines water waste as any water other than natural precipitation flowing into a public right-of-way, a storm drain, or adjacent private property, and neighbors do report it through the online form. Owners get at least one warning notice and a chance to correct the problem first, but a cooler pouring into the street for a month is a citation waiting to happen.

When it is not worth fixing

If the pan has rusted through at a seam, stop. Patching a cooler pan buys a season at best, and the next leak lands in the same ceiling. Galvanized pans on units past fifteen years old are the usual candidates. A new roof-mount or side-draft cooler is $1,500 to $4,000 installed, a window unit $600 to $1,500, and a down-draft or side-draft with 12 inch rigid media currently qualifies for a PNM rebate of up to $400.

What to expect on the call

Tell us whether you got the water shut off, where the water is showing up, and whether there is a mineral streak on the wall. Photos of the stain and of the cooler with a panel off make the diagnosis before anyone drives. We carry floats, overflow tubes, and fittings. If the pan is the problem you will get both numbers, repair and replace, and an honest opinion about which one you should take. Prevention is the $100 to $200 fall shutdown, which drains the pan and the line before the freeze that splits them.

Frequently Asked Questions

Water is pouring off my roof from the cooler. What do I do right now?

Shut the water off. There is a valve on the supply line, usually at the wall where the quarter inch line leaves the house or at a hose bib below the unit. Closing it stops the flow immediately and the cooler will keep blowing air off whatever is left in the pan. Then book the visit.

What causes a swamp cooler to overflow onto the roof?

A float valve set too high or stuck open, an overflow standpipe scaled shut so the pan cannot drain, or a pan rusted through at a seam. Floats and overflows are $100 to $250 repairs. A rusted pan is a replacement conversation, not a repair.

The water is coming through my ceiling, not off the roof. Is that the cooler?

Often yes, on a down-draft unit. Water gets past the pan or the curb, follows the down-duct into the ceiling cavity, and shows up as a brown ring several feet from the cooler. Shut the supply off and get someone up there quickly, because ceiling water on a flat roof spreads sideways before it drips.

Will an overflowing cooler get me in trouble with the Water Authority?

It can. The Water Authority defines water waste as any water other than natural precipitation that flows into a public right-of-way, a storm drain, or a neighbor's property, and it takes reports through an online form. Property owners get at least one warning notice and a chance to fix the problem before a fine.