Do I Need to Winterize My Evaporative Air Cooler in Phoenix?

do-i-need-to-winterize-my-evaporative-air-cooler-in-phoenixPhoenix is the hottest city in America, with temperatures reaching 90 degrees Fahrenheit over 160 times per year.

People in Phoenix rely on their cooling systems to avoid the harsh temperatures. Most use refrigerant-based systems, but some pair it with a swamp air cooler as well.

In a hot, dry climate like Arizona, it’s common for people to use their evaporative air cooler for 10 months per year. However, all it takes is one harsh winter for your cooler to become damaged.

Keep reading to find out why it’s important to winterize your swamp cooler before it’s too late!

The Benefits of Winterizing Your Swamp Cooler

Winterization is a regular part of evaporative cooler maintenance. It involves several steps that help ensure your swamp cooler survives the winter.

Here are a few key benefits that winterization offers.

Prevents a Frozen Water Line

Freezing temperatures can cause your water line to burst.

To avoid this, start off by finding your water supply valve and turning it off. Following this, disconnect the water line from your unit, and make sure to drain it out.

Lastly, put the water line down where freezing temperatures cannot affect it.

Prevents Mildew and Rust

The base of the cooler contains plenty of standing water. Given enough time, this can result in mildew growth and corrosion. If the water freezes, it can also lead to even more damage.

Find your drain plug and remove it with a wrench or pliers. Next, empty the water.

Use a water hose to wash away any remaining minerals. Make sure to wipe down the container with a towel, as this helps prevent rust from building up. Put the panels back on the unit once you’re finished.

Protects Your Unit from the Elements

An exposed cooler can cause dust and debris to build up all over your motor and ducts. The best way to avoid this issue is to use an evaporative air cooler cover.

Measure your swamp cooler to determine the size you need. When you purchase a cover, just drape it right over the cooler. Make sure you cover the entire unit and tie the drawstring located in the corner to keep the cover on the cooler throughout the winter.

Helps You Avoid Losing Heat

Using a swamp cooler cover will prevent some heat loss. For best results, however, you may also need to address the inside of the home.

If your vent has a louver, close it entirely. You may need to pull the vent cover off and insert some insulation. You can also use a piece of cardboard instead.

The Best Time to Winterize Your Evaporative Air Cooler

Ideally, you should plan to winterize your swamp cooler during the fall. The best time would be around November when the average low gets down to about 53 degrees Fahrenheit.

You should also plan to get another inspection during spring. This way, you can ensure that your cooler functions properly once the summer kicks in.

Final Thoughts on Preparing Your Swamp Cooler for the Winter

Winterizing your evaporative air cooler is vital for prolonging its lifespan. However, there a couple precautions you should take.

First, always cut the power off before working on the cooler. If your cooler has a disconnect, go ahead and pull the power cord out of the unit. If not, open the breaker panel, turn the breaker off.

Also, when climbing onto the roof, avoid wearing shoes that are prone to slipping. Choose boots or tennis shoes that have good traction.

Feel free to contact us today if you need an annual winter checkup for your swamp cooler!


If you want the best Phoenix HVAC contractors, you need to call Hays Heating & Cooling today! Call us at (602) 661-9350 or email us to to schedule an appointment! It Pays To Call Hays!


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