Do I Need a Permit to Install or Replace a Swamp Cooler?

A new swamp cooler installation needs a permit in every jurisdiction below, but a straight replacement is a different question, and the answer depends on where you live. Tucson and Pima County put it in writing: swap a cooler for the same type and size and no permit is needed. Albuquerque, El Paso and the City of Las Vegas exempt only portable coolers, and Salt Lake area departments list cooler replacement as permit work. Phoenix used to exempt in-kind replacements up to 6,500 cfm, and that line is gone from its 2024 code.

Below is the rule for each Southwest city we could confirm from the building department's own documents, the changes that turn an exempt swap into permitted work, and the repairs that never need a permit at all. For the job itself, see the swamp cooler installation guide.

Permit rules by city and county

Each row is drawn from that jurisdiction's own permit-exemption list, handout or code text, listed under Sources. "Fixed cooler" means a rooftop, wall or ground unit wired and plumbed in place, as opposed to a portable unit on wheels or a window unit that plugs in.

A "quick permit" in Denver is one issued without plan review: you still apply, but you do not submit drawings. In Albuquerque the fee schedule shows how small the bill is: $7.00 per non-portable cooler on the mechanical side and $4.00 per cooler of any size on the electrical side, each on top of a $23.50 administrative charge per permit. That is a small share of a typical installed cost.

Why "like-for-like is exempt" is only half right

The belief that a straight swap never needs a permit is common because it is true in some of the biggest cooler markets. Tucson and Pima County both say so plainly, and Phoenix's "Work Exempt from Permit" handout (revision 07/14, still hosted on phoenix.gov) exempted "repair or replacement in kind of evaporative cooling equipment rated not more than 6,500 cfm (3067 L/s) capacity." Its commentary explained the reasoning: coolers under 6,500 cfm "are typical for residential use and present minimal hazard other than their electrical connections and water overflow."

That handout is out of date. Phoenix's 2024 Building Construction Code amendments to Section 105.2, adopted by Ordinance G-7397 and effective August 1, 2025, list the mechanical work exempt from permit. "Portable evaporative cooler" is on the list, and so is in-kind replacement of outdoor refrigeration units up to 5 tons in the same location and no heavier than the old one. The 6,500 cfm evaporative cooler item does not appear. A Phoenix homeowner reading the old handout would conclude that a rooftop swap is exempt; the code in force says otherwise.

Outside Arizona, the exempt lists share almost identical wording. Albuquerque, El Paso and Phoenix's 2024 list all exempt portable heating appliances, portable ventilating equipment, portable cooling units, portable evaporative coolers, and replacement of a part that does not alter the equipment's approval. None of them mentions replacing a fixed cooler. So in those cities, a rooftop or side-draft swap is ordinary mechanical work, even when every connection is reused.

What ends the exemption, even in Tucson and Pima County

Where a replacement is exempt, the exemption covers a replacement and nothing more. Phoenix's commentary on in-kind replacement of outdoor refrigeration units spells out the assumption behind the term "in kind": that "the existing infrastructure, such as roof framing, ductwork and electrical connections, will not require modification." Any of these changes takes a job out of that box:

1. A bigger or different unit. Tucson's exemption is for the "same type and size," and Pima County's for a "like unit." Moving from a 4,500 to a 6,500 cfm downdraft, or from a side-draft to a downdraft, is new equipment. If you are upsizing, check the numbers in how to size a swamp cooler first.
2. Any ductwork change. Tucson requires a permit for "installing, replacing, or modifying ductwork," and Pima County for "modifying or replacing duct work." A larger cooler often needs a larger drop, so upsizing usually brings a duct permit with it. Sizing is covered in ductwork for evaporative coolers.
3. A new roof penetration. Moving the cooler means a new hole, new flashing and a patched old one. Denver lists new roof penetrations as roofing permit work.
4. New or changed wiring. A new circuit, disconnect or relocated outlet is electrical work. The City of Las Vegas exempt list covers only like-for-like replacement of damaged outlets and defective breakers; new wiring is not on it.
5. A new wall opening. Las Vegas exempts a portable cooler in a window but requires a permit for "installation within a wall opening created for such." See window cooler installation for the no-cut approach.
6. A protected district. In Tucson, a Historic Preservation Zone or Neighborhood Preservation Zone means a permit for the same swap that is exempt elsewhere in the city.

Repairs that never need a permit

Most cooler work is not a replacement at all. Phoenix, Albuquerque and El Paso all exempt replacing a part that does not alter the equipment's approval or make it unsafe, and the City of Las Vegas exempts "replacement of any minor part." That covers the jobs owners do every season:

• Pads, whether aspen or rigid media; see how to replace swamp cooler pads.
• The pump, following how to replace a swamp cooler pump.
• The blower motor, with a same-rating replacement chosen from the motor guide.
• Belts, pulleys, bearings, float valves, distribution lines and the spider.

The line is the cabinet. Swapping parts inside the same cabinet is a repair. Removing the cabinet and setting a new one is equipment replacement, which is where the rules in the table apply.

What an inspector looks at

A permitted cooler job is inspected against the mechanical code's evaporative cooling section. Phoenix's 2024 amendment to Section 928 of the International Mechanical Code is a clear example. It requires that evaporative cooling equipment:

Installation

Follows the manufacturer's instructions, on a level platform.

Roof and wall openings

Are flashed in accordance with the building code.

Water supply

Is approved, sized for peak demand, with the potable supply protected as the plumbing code requires.

Relief air

Has "a permanent relief opening or other engineered design sufficient to assure positive airflow" to balance intake air.

Ducts and dampers

Comply with the code's duct chapter.

Overflow

Discharges to an approved disposal location.

The relief-air item surprises people: in Phoenix it is a code requirement, not just good practice. Our venting and relief air guide works out how much opening a given cooler needs. Supply and overflow piping is covered in water supply and drain lines.

Where this table stops applying

• Neighboring cities. Mesa, Scottsdale, Henderson, North Las Vegas, Rio Rancho and Las Cruces each run their own building department. Unincorporated areas around Las Vegas fall under Clark County, not the city.
• Manufactured homes. In Clark County, items installed inside or attached to a manufactured home must be permitted and inspected by the Nevada State Manufactured Housing Division, not the county.
• Code updates. Phoenix's change shows that exemptions move when a city adopts a new code edition. The Albuquerque and El Paso rows come from ordinance texts each city posts (El Paso's is dated 2016); a newer edition could change them.

Check your own city in five minutes

1. Find the right department. Search your city name plus "work exempt from permit." If you live outside city limits, use the county.
2. Read the mechanical list. Look for the words "evaporative cooler." If the only entry says "portable," a fixed cooler swap needs a permit.
3. Describe the job precisely. When you call, say "replacing a rooftop evaporative cooler with the same size unit, reusing the existing drop, water line and circuit." Vague questions get cautious answers.
4. Ask who may pull it. Ask whether you can apply as the owner or need a licensed contractor, and which inspections the job will get.

If you are hiring the work out, ask that the permit be listed as its own line on the quote, as recommended in the cost guide.