Spring Swamp Cooler Start-Up in Reno

A spring swamp cooler start-up in Reno runs $120 to $250 in labor plus pads (aspen $80 to $200 a set, rigid media $300 to $700), and how it goes in late April usually decides how many warm-air calls you make in July. We clean the pan, put in new pads, oil the blower bearings, tension the belt, set the float, look for a freeze split in the water line, and run the cooler on each speed. Book it after the airport’s 50 percent last-freeze date of April 26, and pair it with a fall winterization for $200 to $400 as a package.

Picking the date in the Truckee Meadows

Spring comes late here, and it does not keep its promises. NOAA’s 1991-2020 normals for Reno-Tahoe International Airport put the 50 percent date for the last 32 degree night at April 26, and there is still a 10 percent chance of a freeze after May 12. The 28 degree hard-freeze date, the one that splits a full water line, runs earlier, April 8 at 50 percent, but the 36 degree date, which is when an exposed roof line can freeze while the airport thermometer does not, runs later, May 10 at 50 percent. The cooperative stations around the valley are later still: Sparks’ 50 percent date for the last 32 degree night is May 10, Stead’s is May 15, and Carson City’s is May 19.

So the start-up window is late April into mid-May for the city, and the second half of May for Carson City and the higher valleys. Earlier than that and you are betting a quarter-inch copper or poly line on the roof against a Sierra cold front. Later than that and you are sweating through the first 85 degree afternoons: the June normal high is 84.6 degrees with 10.2 days at 90 or hotter, and May already has a normal high of 74.1. The smart booking is the last week of April for a Reno or Sparks house that wants cooling on the first hot day rather than the first hot week. The April post picks the week station by station.

What a start-up includes

1. Inspection with the cover and panels off. We go through the pads, pan, pump, float, belt, motor, blower bearings, water line, and down-duct damper. Anything that failed over the winter gets found here, not in July.
2. Pan cleaned. Last summer’s scale, a winter of dust, and whatever the Washoe Zephyr blew in come out. Leave the sludge in and the house smells like standing ditch water by July.
3. New pads. Aspen pads are replaced every spring as a rule; a season of evaporation crusts them by August whatever the supply reads, and TMWA’s published area samples have run as high as 13.9 grains per gallon in Southwest Reno, so there is no assuming soft. Reused aspen cools badly and smells worse. Rigid media gets a look and a rinse and goes back in; it is built for 3 to 5 years. The pad replacement page covers the choice.
4. Pump primed and checked. We look for a scaled impeller, a housing cracked by ice, and a blocked inlet screen. If the pump was laboring by last September, it is not making it through this July, and we will tell you so.
5. Float adjusted. The pan should fill to its mark and shut off, and the overflow standpipe should be open. Stuck open, a float floods the roof; set low, it starves the pads and you get warm air.
6. Bearings oiled and belt tensioned. Blower shaft bearings take a few drops of oil each spring or they scream by August. We set the belt to the right deflection, because a tight belt wears out motor bearings and a loose one slips and squeals.
7. Water line pressure-checked. If the cooler was not drained last fall, this is where it shows. Replacing a split line from the hose bib up to the roof is $100 to $400, depending on how long the run is.
8. Damper and relief. We open and check the down-duct damper, and tell you which windows to crack so the cooled air has a way out.
9. Each speed run. Pump-only, then low, then high, watching every side of the pads wet evenly before we come down off the roof.

The undrained cooler: what April start-ups turn up

The most common start-up surprise in Reno is a cooler that was left full into the fall’s first freeze. NOAA’s normals put a 50 percent chance of that night by October 19 at the airport and by October 5 in Sparks, and Reno averages 111.6 nights a year at or below 32. Water in the supply line, the float, and the pump housing froze, expanded, and split whatever it was in. Come April, that looks like water spraying the moment the valve opens, a float that never closes, or a pump that hums without moving a drop.

That is exactly why the start-up is worth booking. Better that we spot it from the roof than you spot it as a brown ring on the ceiling, and every part gets priced against the published ranges before anything is swapped. A winterization at $100 to $200 in October would have avoided it, which is why the package exists.

Neighborhood notes

• Sparks north of the tracks. The 1950s housing boom built the low-slope ranches where most of the valley’s down-draft coolers sit on a curb over the hallway. Easy access, coolers often original to the house. Start-ups here are quick unless the pan is rusting, and you should be told if it is. See the Sparks page.
• The Old Southwest and Newlands. Early twentieth-century bungalows and period revivals with steep roofs and finished attics, so side-draft and window coolers are common. Same checklist, a closer look at the wall or window seal, and more ladder time.
• Country Club Acres and the mid-century southwest. Post-war ranches from the early 1940s on. Low roofs, single cooler feeding a hall grille, and wiring that has been extended more than once, so the start-up includes a look at the cooler’s own control and leads.
• Spanish Springs and Fernley. Newer stock, often with both a cooler and refrigerated air. On these houses we also check that the AC return is not working against the cooler and that the cooler damper shuts tight whenever the AC is on. See the Spanish Springs and Fernley pages.

The scale question, every spring

Every gallon a cooler evaporates leaves its minerals in the pan, and in Reno the supply is not one number: TMWA’s published area samples range from under 2 grains per gallon to nearly 14 depending on the area and the quarter, and TMWA states that the groundwater wells it runs from mid-April through October can and do change the water chemistry somewhat. If you add one thing at start-up, make it a bleed-off line or a purge pump: either one sends a little of the mineral-loaded pan water down the drain so the minerals cannot build. Pads last about twice as long and the pump does far less work. No bleed-off on your cooler yet? We will price one alongside the start-up.

What it costs

Roof access and cooler size move the labor number. Everything else is on the pricing page.

We do start-ups across Reno and out to Sparks, Sun Valley, Spanish Springs, Carson City, Fernley, Dayton, and Gardnerville. In the Carson Valley and Fernley, book early and say which week you want it running. Wondering whether the cooler made it through the winter? A photo of the inside lets us tell you what we expect to find before we show up.