Swamp Cooler or Heat Pump? How to Choose for Your Region
Swamp cooler vs heat pump by US region: climate fit, heating needs, install and running costs, worked annual cost examples, and when to pair both systems.
Short answer
In dry regions such as Denver, Salt Lake City and Reno, a swamp cooler is the cheapest way to cool, and a heat pump makes sense mainly if you also want electric heating. In monsoon deserts, many homes benefit from both. In humid regions a heat pump is the clear choice because evaporative cooling cannot keep up.
Key takeaways
- A swamp cooler only cools; a heat pump heats and cools, so the comparison really includes your heating system.
- Dry Intermountain West: cooler for summer, heat pump only if replacing a furnace or electrifying heat.
- Low deserts with monsoon: cooler for dry months plus a heat pump for humid weeks and winter heat is a strong combination.
- Humid regions: heat pump (or AC), with coolers limited to garages, shops and patios.
- Cooler running costs are typically a quarter or less of heat pump cooling costs in dry weather.
On this page
The answer depends on two questions: how dry are your summers, and what are you doing about heat? A swamp cooler is the cheapest way to cool a house in a dry climate, but it does nothing in winter. A heat pump costs much more to install, works in any summer humidity and also replaces or supplements your furnace. So in the dry West the real choice is often "cooler plus existing furnace" versus "heat pump for both," and in monsoon deserts the best answer is frequently both systems, each doing what it does best.
What each system does well
| Factor | Whole-house swamp cooler | Ducted heat pump |
|---|---|---|
| Cooling | Yes, in dry air only | Yes, in any climate |
| Heating | No | Yes |
| Dehumidifies | No, adds moisture | Yes |
| Power while cooling | About 0.5 to 1.0 kW | About 2 to 4 kW for 3 to 4 tons |
| Installed cost | Typically $2,500 to $6,000 | Typically $10,000 to $20,000 ducted; ductless $3,500 to $8,000 per one or two zones |
| Water use | 3 to 15 gal/h plus bleed-off | None |
| Windows | Open or relief dampers needed | Closed |
| Maintenance | Seasonal owner tasks, pads | Filters, annual service |
For a straight cooling comparison with central AC, which behaves similarly to a heat pump in cooling mode, see swamp cooler vs air conditioner.
Region-by-region recommendations
| Region | Summer | Winter | Typical best fit |
|---|---|---|---|
| Front Range and Colorado high desert | Dry, warm days, cool nights | Cold | Cooler for summer; cold-climate heat pump if replacing a furnace |
| Wasatch Front, Utah, southern Idaho | Dry, hot | Cold | Cooler; heat pump optional for heating |
| Reno and Great Basin | Very dry, hot days | Cold | Cooler; heat pump optional for heating |
| Albuquerque and Santa Fe | Dry, with milder monsoon | Cool to cold | Cooler as primary; heat pump if electrifying |
| Las Vegas and Mojave | Very hot, mostly dry | Mild | Cooler plus heat pump or AC for occasional humid spells |
| Phoenix, Tucson, El Paso | Very hot, monsoon humid July to September | Mild | Both: cooler for April to June, heat pump for monsoon and winter |
| Inland California valleys | Hot, mostly dry | Mild | Cooler works well; heat pump common for heating and hot humid spells |
| Great Plains west of about 100 W | Hot, variable humidity | Cold | Heat pump or AC primary; cooler for shops and garages |
| Pacific Northwest interior (eastern WA and OR) | Dry, hot spells | Cold | Cooler viable; heat pump popular for heating |
| Gulf Coast, Southeast, Midwest, Northeast | Humid | Varies | Heat pump (or AC); coolers only for outdoor and barn use |
For the climate reasoning behind these tiers, see best climates for swamp coolers and our climate index.
Worked annual cost comparisons
These examples compare only summer cooling electricity and water. Rates and run hours are illustrative; substitute your own in the operating cost calculator.
Worked example 1: Salt Lake City area, 1,800 sq ft
About 700 cooling hours per year. Electricity $0.13 per kWh, water and sewer $5 per 1,000 gallons.
Cooler: 0.75 kW x 700 h = 525 kWh, or $68. Water at about 9 gal/h including bleed-off: 6,300 gallons, or $32. Total about $100 per year.
Heat pump, cooling only: 2.6 kW average x 700 h = 1,820 kWh, or $237 per year.
Annual cooling difference: about $137. Recovering the extra cost of a ducted heat pump from cooling savings alone would never happen. A heat pump only makes financial sense here if it also displaces expensive heating (propane, electric resistance) or is replacing a failed furnace and AC anyway.
Worked example 2: Phoenix area, 1,800 sq ft
About 2,400 cooling hours per year, of which about 1,000 fall in monsoon weeks when the cooler is marginal. Electricity $0.14 per kWh, water and sewer $6 per 1,000 gallons.
Heat pump all summer: 3.5 kW x 2,400 h = 8,400 kWh, or $1,176.
Cooler for the 1,400 dry hours, heat pump for 1,000 monsoon hours: cooler 0.85 kW x 1,400 = 1,190 kWh plus water at 14 gal/h x 1,400 = 19,600 gallons ($118). Heat pump 3.5 kW x 1,000 = 3,500 kWh. Electricity total 4,690 kWh, or $657, plus $118 water: about $775.
Savings from pairing: about $400 per year compared with the heat pump alone, while keeping full comfort through the monsoon.
The pattern holds broadly: the hotter and longer your dry season, the more a cooler saves; the more humid weeks you have, the more a heat pump earns its place. See swamp cooler operating cost for a deeper breakdown.
Heating changes the math
Most of the dry West has real winters. Denver, Salt Lake City, Reno, Boise and Albuquerque all see regular nights below 20 F. If your furnace is young and gas is affordable, a cooler is the low-cost summer partner and a heat pump adds little financial value. If you are replacing a furnace, heating with propane or electric baseboard, or planning to add solar, a cold-climate heat pump becomes much more attractive because it covers both seasons.
Two practical points technicians commonly raise:
- Duct compatibility. Cooler ducts are sized for high airflow and often enter through a dedicated roof jack. Heat pump air handlers run lower airflow through different ducts. Sharing ducts requires motorized or tight manual dampers so humid cooler air never reaches the heat pump coil and heated air does not escape through the cooler in winter.
- Winter sealing. A cooler duct left open in winter is a large hole in the ceiling. Use an insulated register cover or a sealed damper, and cover the cooler; see how to winterize a swamp cooler.
A decision procedure
- Check your climate. If your design wet bulb is above about 74 F, choose a heat pump or AC and stop here.
- Check your heating situation. Furnace age, fuel cost and whether you want to go all-electric.
- Count humid weeks. More than about four weeks a year with afternoon dew points above about 60 F argues for having refrigerated cooling available.
- Price both paths. Cooler only, heat pump only, and cooler plus heat pump (ducted or ductless). Include duct work, electrical and roof work.
- Compare 10-year costs. Installed cost plus annual operating cost times 10, minus any rebates.
Pro tip: In monsoon climates, a ductless heat pump serving the bedrooms plus a whole-house cooler is a cost-effective combination. The heat pump covers humid nights and winter heat in the rooms that matter most, while the cooler handles the house for most of the summer.
Mistakes to avoid when running both systems
- Running them at the same time. The cooler adds moisture that the heat pump must then remove, and the open windows the cooler needs let conditioned air escape. Use one system at a time, and close the cooler damper before switching.
- Leaving the cooler duct open into heat pump ducts. Humid air reaching a cold heat pump coil, or a cold winter duct, can cause condensation and odors. Use tight, labeled dampers.
- Undersizing the heat pump because "the cooler handles most of it." The heat pump must carry the house on its hardest days, which are often humid monsoon afternoons or the coldest winter nights. Insist on a proper load calculation.
- Letting the cooler slide on maintenance. With a heat pump available, owners sometimes skip cooler startup, then find a burned pump and scaled pads in June. Keep the spring startup checklist on the calendar.
- Forgetting winter sealing. A leaky cooler duct can measurably increase heating costs, and it undercuts the heat pump's efficiency.
A simple switchover rule many households use: run the cooler while the afternoon dew point is below about 55 to 60 F and indoor RH stays under about 60%; switch to the heat pump when either threshold is crossed for more than a day or two. The monsoon season guide has a fuller dew point table.
Health, comfort and household factors
Climate and money are not the whole decision. A heat pump keeps indoor humidity low, which can matter for people sensitive to mold or dust mites; see swamp coolers, allergies and asthma. A cooler supplies constant fresh air, which some households strongly prefer, and keeps working with a smaller electrical service. Wildfire smoke seasons favor a closed house with filtration. If you rent or cannot alter the roof, a window or portable unit of either type may be your only option; see types of swamp coolers.
When you are ready to price a cooler, cost to install a swamp cooler covers labor, roof jack, duct and electrical items. For heat pump sizing and installation, get a load calculation from a licensed HVAC contractor.
Frequently asked questions
Can a heat pump and a swamp cooler share the same ductwork?
Sometimes, but it requires careful design. Cooler ducts are usually larger and carry much more airflow, and the two systems need tight dampers so cooler air and moisture do not enter the heat pump's air handler. Many homes keep the systems separate or use a ductless heat pump.
Do heat pumps work in cold climates like Denver or Salt Lake City?
Modern cold-climate heat pumps are designed to keep heating at outdoor temperatures well below freezing, and many keep useful output near 0 F or below. Some homes keep a gas furnace or electric strip heat as backup for the coldest days.
Is a swamp cooler or a mini split better for one room?
In a dry climate a window or portable cooler is cheaper to buy and run. A mini split costs more but works in any humidity, dehumidifies and also heats, so it is the better long-term choice for a room that needs year-round comfort.
Are there rebates for heat pumps or evaporative coolers?
Many utilities and state programs offer heat pump incentives, and some Southwest utilities have offered evaporative cooler rebates. Programs change often, so check your utility and the ENERGY STAR rebate finder before buying.
Will a heat pump lower my bills if I already have a swamp cooler?
Usually not for summer cooling in a dry climate, because the cooler is already cheaper to run. Savings come mainly from heating if the heat pump replaces electric resistance heat, propane or, in some cases, an old gas furnace.
Sources and further reading
- Evaporative Coolers, U.S. Department of Energy, Energy Saver
- Heat Pump Systems, U.S. Department of Energy, Energy Saver
- ENERGY STAR Heat Pumps and Rebate Finder, ENERGY STAR
- ASHRAE Handbook: Fundamentals (Climatic Design Information), ASHRAE