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Evaporative coolers, swamp coolers, whatever you call them, are a genuinely good fit for a dry desert and a genuinely bad fit for a humid one. Las Vegas is dry, which is why so many older homes here still have one. That does not make them the right choice for every house, and it does not make them wrong either.
The useful question is not which is better. It is which one matches how your house is built and how you actually live in it.
How Each One Actually Works
The difference in mechanism explains every practical difference that follows.
Evaporative Cooler
Pulls outside air through wet pads. Water evaporating into dry air absorbs heat, so the air comes out cooler and more humid. It needs a constant supply of fresh outside air and an exit path, which is why windows stay cracked.
Air Conditioning
Moves heat out of the house using refrigerant, recirculating the same indoor air. The house stays closed. Cooling capacity does not depend on outdoor humidity, and it removes moisture rather than adding it.
The Honest Comparison
| Evaporative Cooler | Air Conditioning | |
|---|---|---|
| Power use | Substantially lower | Higher, it is the main summer load |
| Water use | Significant, ongoing | None |
| Performance in dry heat | Good | Good |
| Performance during monsoon humidity | Drops off noticeably | Unaffected |
| Performance on the hottest days | Limited, cannot reach low indoor temps | Holds a set temperature |
| Windows | Must stay partly open | Closed |
| Air quality | Constant outside air, brings dust and pollen in | Filtered, recirculated |
| Maintenance | Pads, pump, belt, mineral scale, seasonal startup and shutdown | Filter changes plus a tune-up or two per year |
| Equipment cost | Lower | Higher |
When a Swamp Cooler Makes Sense
- Garages, workshops, and covered patios where the goal is bearable rather than climate controlled
- Homes where one already exists, works, and the owner is happy with the comfort level
- Situations where operating cost matters more than hitting a precise temperature
- Spaces already open to outside air, where the window requirement is not a drawback
When to Move to Air Conditioning
- Anyone in the house with asthma, allergies, or sensitivity to dust, since constant outside air works against you here
- Homes where the cooler cannot keep up in July and August and the family is buying window units to compensate
- Rising water bills and mineral scale problems that make the maintenance a recurring annoyance
- Anyone who wants the house closed and secure, which the open-window requirement makes harder
- Resale considerations, since central air is what most buyers in the valley now expect
Running Both
Some Las Vegas homes have both, and the strategy works: the cooler handles the milder stretches at low cost, and the air conditioning takes over when it gets truly hot or humid. The important part is not running them at the same time. An evaporative cooler pushing humid outside air into a house whose AC is trying to cool and dehumidify makes both work harder for a worse result.
If you are considering a conversion, the guide to AC system types covers what would fit your house. For service on an existing system, see our air conditioning services or the maintenance guide.
Not Sure Which Your House Should Have?
We will look at your setup, tell you honestly whether a conversion is worth it, and price it either way. Free estimates, 36-month 0% financing with 90 days of zero payments.
(702) 333-8057 — Call NowSchedule OnlineFrequently Asked Questions
Do swamp coolers still work in Las Vegas?
Yes, for most of the season. Our humidity is low enough that evaporative cooling is effective, which is exactly why they were standard here for decades. Where they struggle is the peak of summer and the monsoon weeks, when the air holds more moisture and the cooling effect weakens.
Is it cheaper to run a swamp cooler than AC?
On electricity, clearly yes, and the gap is large. Water use offsets some of that, and so does the maintenance. The real trade is not cost, it is comfort ceiling. You are paying less and accepting less control over the indoor temperature.
Can I convert my swamp cooler over to air conditioning?
Usually yes. What it takes depends on whether the house has usable ductwork, since evaporative systems often use oversized ducts and a different distribution layout that does not transfer directly. The roof opening also has to be closed properly. It is a straightforward job for someone who has done it before, and worth getting looked at rather than guessed at.