Swamp Cooler Installation and Replacement in Reno

A new swamp cooler installed in Reno runs $1,500 to $4,000 for a roof-mount or side-draft unit and $600 to $1,500 for a window cooler. Two things move it: how much air the new cooler moves, and how much of the old setup we can keep. Same size on the same curb, duct, and circuit is the low end; more CFM plus a new curb, down-duct, and circuit is the high end. The permit comes from whichever of the seven offices in the service area covers your address, Nevada requires a C-21 license for the work (ask for the number, ours included, and check it), and no rebate is assumed because we could not find one. A photo of the old unit sitting on its curb is enough for us to firm up the number.

When we tell you to replace it

On most Reno roofs the fix is a $150 to $400 part, and the repair page is where we would rather keep you. We recommend a new cooler in three cases:

• The pan is gone. Once the galvanized pan has holes in it, or the frame comes off in flakes under your hand, no patch carries it through another summer. A rusted-out pan also sends water across the roof, and that water rots the decking beneath the curb.
• The house was always under-cooled. A lot of the post-war ranches in Sparks and the mid-century southwest got the smallest cooler that would fit the curb. When the back bedrooms have been stuffy every July since you moved in, the cure is more CFM, and replacement day is when you get to choose it.
• You are past the third patch. New pump, new motor, a float bent back into shape, solder on the pan: at that point the old box is costing you a new cooler, just in installments.

Sizing a cooler for a Reno house

Coolers are sold by CFM, the cubic feet of air they move each minute, and the working rule is half the cubic footage of the area you are cooling. Run that on a 1,500 square foot single-story with 8 foot ceilings and you get 12,000 cubic feet, or about 6,000 CFM. On a two-story or an open plan we size to the floor the cooler actually serves. Too big, and the cooler burns water and moves air faster than the pads can soak; too small, and you have the problem most of Reno’s older houses already have.

The math only works because Reno is so dry. NOAA’s 1991-2020 normals put the airport’s July normal high at 93.9 degrees with 53.9 days a year at 90 or hotter, July precipitation at 0.20 of an inch, and July relative humidity averaging 36 percent; the long-term July dew point in the climate record is about 40 degrees. At that dew point a properly sized cooler with saturated pads drops incoming air 20 to 25 degrees. On the handful of monsoon afternoons a year, like the August 23 to 28, 2025 push the Weather Service logged, it does not do much at all. A correctly sized cooler with rigid media handles June through September well and does its honest best on the sticky days, which is why coolers are sized for the dry months, with honesty about the exceptions.

There is a Reno-specific sizing note. The airport’s July normal low is 60.4 degrees, and June and September nights are in the low 50s. A big single-speed cooler that is right at 3 p.m. is freezing the house by 10, so a two-speed motor and a thermostat are worth specifying here more than in most cooler towns.

Roof-mount, side-draft, or window

Roof-mount down-draft is the valley standard: a cooler on a curb over the hallway, a short down-duct, and one big ceiling grille that feeds the whole house. Low-slope ranch roofs make it easy. Best cooling per dollar, and the start-up and winterization are simple.

Side-draft units sit at the roof edge or hang on a wall and push air sideways, into a duct or straight through the wall. Common in the Old Southwest and Newlands district where roofs are steep or attics are finished, and on additions. Slightly more ducting, easier ladder work.

Window units run $600 to $1,500, go in within an afternoon, and handle a room or two, which suits a rental, a garage shop, or a house on refrigerated air with one room that never cools. Inside they carry the same pump and pads as a roof unit, and they wear out the same ways.

What the install includes

1. Old cooler off the roof, then we check the curb, the down-duct, and the decking around them. If years of overflow have rotted wood, this is where we find it, and you see it priced before we touch it.
2. Curb and flashing. If they are solid we keep them; if not, we rebuild them. A leaking curb is a ceiling stain by the first thunderstorm, and Reno’s summer storms, when they come, come hard; the Weather Service estimated about 2 inches in under an hour on Hidden Valley on July 21, 2024.
3. Setting and ducting. We connect and seal the down-duct, fit a damper that shuts the duct tight for winter or whenever the refrigerated air is on, and match the ceiling grille to the cooler’s CFM.
4. Water. Fresh quarter-inch line to the roof off a saddle tap or hose bib, run so it drains easily in October, and a shutoff valve placed where you can turn it without climbing. A bleed-off line or purge pump set up from day one, because TMWA’s hardness swings by area and by quarter and the pan concentrates whatever arrives.
5. Electrical. We wire the cooler to its control and switch. If the cooler needs a new circuit or a disconnect at the panel, that is licensed electrician work and it is shown on the quote.
6. Balance and test. Pad saturation on every side, float level, bleed-off rate, damper travel, window relief, and every speed tested before we leave.

Permits: seven offices

The Reno metro is a city, a second city, an unincorporated county, a consolidated municipality, and two more counties, and each permits separately. The City of Reno’s Development Services takes every building permit through the ONE Regional online portal and points to the residential code’s exempt-work section for what does not need one. The City of Sparks lists furnaces and water heaters among the small jobs that need a permit and takes applications online only. Unincorporated Washoe County, which includes Sun Valley and Spanish Springs, requires a permit for anything not on the exempt list in County Code Chapter 100. Carson City is its own consolidated municipality. Dayton is unincorporated Lyon County, permitted from Yerington. The City of Fernley issues its own permits inside city limits. Gardnerville is Douglas County, permitted from Minden under the 2024 codes the county adopted effective January 5, 2026. The office for your address decides whether a permit is required and sets the fee; the permits and licensing page has the full table.

Licensing and rebates

Installation is C-21 work under NAC 624.380, which names equipment that uses evaporation to control air temperature, and the Nevada State Contractors Board license number is yours to check before anyone arrives, ours included. On rebates, the honest answer: we looked for an NV Energy evaporative cooler rebate and could not find one. The programs we could locate are built around central air and heat pumps. Nothing on this page assumes a rebate.

What it costs

If the honest answer for your house is refrigerated air instead, the cooler versus refrigerated air page lays out those numbers without pushing them. We install across Reno and out to Sparks, Sun Valley, Spanish Springs, Carson City, Fernley, Dayton, and Gardnerville. Photograph the old cooler, the curb under it, and the ceiling grille, tell us how many square feet you want cool, and we will come back with a size, a spec, and a price from the table above.