Swamp Cooler vs Central AC
Half the older homes on the Wasatch Front still run swamp coolers. In Utah's dry June they're great — in the August monsoon they're a humid 82°F living room. Here's the honest math on keeping vs converting.
Evaporative (Swamp) Cooler
Water-evaporation cooling — cheap to run, weather-dependent
- Lowest operating cost in dry weather — about 1/4 the electricity of central AC
- Cheap to install or replace ($1,500–$3,500)
- Brings in 100% fresh outside air — no recirculation
- Simple mechanics — pads, pump, blower; many repairs are DIY-able
- Stops working when it's humid — exactly when Utah's July–August monsoon hits
- Can't hold a setpoint — output drifts with outdoor conditions
- Uses 3–15 gallons of water per hour, a real cost in a drought state
- Twice-yearly maintenance (spring startup, fall winterization) or the pads scale up with our hard water
- Roof penetration + winter cover = common source of air leaks and ceiling stains
Budget-focused homes in dry benches and valley floors, detached garages and shops, homeowners who tolerate temperature swings and don't mind the seasonal maintenance ritual.
Refrigerated Central AC
Compressor-cycle cooling — holds setpoint in any weather
- Holds 72°F whether it's dry June heat or muggy August monsoon
- Dehumidifies as it cools — matters more in Utah than people think
- Pairs with your existing furnace ductwork and one smart thermostat
- Filters and recirculates air — better for inversion-season air quality and allergies
- Adds resale value; swamp coolers increasingly read as 'project house' to buyers
- Higher operating cost (though modern 16+ SEER2 units cut that substantially)
- Higher install cost, especially if ductwork needs sizing corrections
- Capacity derates ~4% per 1,000 ft of elevation — needs correct sizing math, not rules of thumb
Anyone replacing a dying swamp cooler, homes with working ducts, allergy and air-quality sensitive households, and anyone planning to sell within 10 years.
Our Recommendation
If your swamp cooler is healthy and you genuinely don't mind the seasonal ritual, run it until it dies — the operating cost is unbeatable in dry months. But when it needs a major repair or the roof needs work, convert to refrigerated air: the monsoon weeks, the water use, the winterization, and the resale hit all point the same direction. Most Utah conversions reuse existing ductwork, which keeps the project closer to the low end of the range.
Common Questions
Can I convert my swamp cooler to central AC without new ducts?▼
Usually yes — if your furnace ducts are sized right. Swamp coolers move more air than AC needs, so the ducts are rarely the bottleneck; the common gotchas are the return-air path and sealing the old roof or wall penetration properly. We check both during the free estimate.
What does a swamp cooler cost to run vs central AC in Utah?▼
A typical swamp cooler draws 400–700 watts; a 3-ton AC draws 3,000–3,500 watts. But the AC only runs to hold setpoint, while a swamp cooler often runs continuously. Real-world Utah summer bills typically land $30–$60/month for evaporative vs $80–$150 for refrigerated — plus 3–15 gallons of water per hour for the swamp cooler.
Why does my swamp cooler stop working in August?▼
Monsoon humidity. Evaporative cooling works by evaporating water into dry air — when dew points climb in late July and August, there's nowhere for the moisture to go, and output collapses just as outdoor temps peak. That 2–4 week stretch is exactly why many Utah homeowners finally convert.
Still on the fence?
Free in-home estimates with both/all options quoted side-by-side. No pressure, no obligation — just the numbers for your home.
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