Can You Run an Evaporative Cooler All Day?

Can You Run an Evaporative Cooler All Day?

A swamp cooler can run 24 hours a day, but it must be supplied with sufficient water. Filling the reservoir with water and adjusting the settings on a manual swamp cooler are required so that it can run continuously throughout the day.

Can you run a swamp cooler 24/7? This article will provide all the information required to answer your questions.

You now know that an evaporative swamp cooler can run continuously throughout the day. You might also be concerned about getting the most out of your cooling system. This article will address your concerns, including the amount of water your swamp cooler uses.

How Much Does It Cost to Run a Swamp Cooler All Day?

A typical swamp cooler can consume up to 62 kWh by operation hours. Running a swamp cooler on the most efficient setting costs $0.15 per kWh or $0.09 per hour. Multiply that by 24 hours to get a total of $2.23 for a swamp cooler run of 24 hours. Multiply that amount by 30 days to get $67 for a month of use of your swamp cooler. Two air conditioners run simultaneously and use about 75% more energy.

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Is a Swamp Cooler Power Consumptive?

On average, a swamp cooler uses less than 1 kilowatt per operation hour. The cost of power per kilowatt-hour is expected to be $0.12. You should expect to pay around $0.10 per hour for the authority to operate your swamp cooler. On the other hand, air conditioners consume 75% more energy than swamp coolers.

Also check: 5 Good Reasons To Put A Ceiling Fan In Kitchen.

How Much Water Is Used by A Swamp Cooler Per Hour?

Swamp coolers consume 3 to 15 gallons of water per hour. Your swamp cooler must be capable of using 7 to 11 gallons per hour. It is due to your cooler’s consistent need to be filled with water and the previous water must be drained out. After all, the water evaporates to keep the device running. When running your device, the estimated cost of water is $0.004 per gallon, equating to about $0.04 per hour. Running the swamp cooler for twenty-four hours will cost $0.97 per day.

Which Is Less Expensive, A Swamp Cooler Or Air Conditioning?

A swamp cooler consumes about one-fourth of the power of an air conditioner. The price difference is because swamp coolers require water to function. Swamp Coolers are higher and more environmentally friendly because they use much less power. The cost of acting on each device at the same time is comparable.

The swamp cooler is eco-friendly because it runs for a shorter period to keep your home cool. The overall cost of cooling your home can be reduced with less running time. The humidity level within the air usually determines the difference in overall performance.

Is It Safe To Leave A Swamp Cooler On All Night?

It is safe to leave a swamp cooler running all night. A swamp cooler can be very effective at night, and the air outside your home may be cooler than the air inside. Swamp coolers with manual reservoirs will no longer be able to paint until the next day. Once the cooling pad has dried, the cooler’s air temperature will be the same as the outside air temperature. You can leave your swamp cooler on all night when you have an automatic fill swamp cooler.

Also check: Can You Replace Ceiling Fan Blades with Longer Ones?

Pros of Running an Evaporative Cooler All Day:

Energy Efficiency:

The excellent energy efficiency of evaporative coolers is one of its key advantages. Evaporative coolers use substantially less electricity than conventional air conditioners, which can be power-saving. When used consistently, they can provide a cost-effective alternative for maintaining a comfortable indoor environment, particularly in hot and dry areas.

Eco Friendly:

Evaporative coolers are environmentally beneficial because they use only water and air to cool your room. They do not use the hazardous refrigerants or compressors used in standard AC systems. Running an evaporative cooler all day reduces your carbon footprint and helps conserve energy.

Fresh Air Circulation:

Evaporative coolers function by sucking in fresh outdoor air and cooling it by evaporation. This steady inflow of fresh air from outside can assist in enhancing indoor air quality by eliminating stale and stagnant air, which is a common problem in houses with closed windows and standard air conditioning systems.

The Drawbacks of Using an Evaporative Cooler All Day:

Limited Cooling:

While evaporative coolers work well in hot, arid climates, they may not work as well in humid climates. In high-humidity areas, the cooling effect may be less obvious, and running the cooler all day may result in excess moisture in your home. It is critical to maintain a balance and avoid overcooling.

Water Consumption:

Evaporative coolers require a steady supply of water to operate. Running them all day consumes more water, which might be an issue in areas where water is scarce. To maintain a sustainable strategy, water usage must be monitored and managed.


Continuous operation can result in greater wear and tear on your evaporative cooler. Cleaning the pads, changing the water, and examining the pump on a regular basis are critical to ensuring peak performance. Maintenance neglect can lead to decreased efficiency and increased energy usage.

Continuous Operation Considerations For Evaporative Cooler:

While operating an evaporative cooler all day can be efficient, there are a few things to consider:

1.    Outdoor Humidity:

Evaporative coolers perform best in low-humidity environments. High humidity levels can limit the cooling process’s effectiveness, making it less efficient to run the cooler continually.

2.    Maintenance and Upkeep:

Regular maintenance is essential for an evaporative cooler’s efficient and long-term operation. Cleaning and replacing pads, inspecting the pump, and ensuring adequate ventilation are all necessary maintenance duties.

3.    Energy Costs:

While evaporative coolers are generally more energy-efficient than traditional air conditioners, it is critical to check your energy consumption to ensure it aligns with your budget and environmental objectives.

4.    Temperature Control:

Evaporative coolers effectively keep indoor temperatures reasonable. In exceptionally hot weather, however, additional cooling methods or complementary systems may be required to reach optimum comfort.

What Is a Good Humidity Level for a Swamp Cooler?

A swamp cooler performs well when the relative humidity is less than 50%. Swamp coolers are more environmentally friendly than air conditioners in hotter climates. In high-humidity environments, air conditioners are unusual; however, swamp coolers can also be used. Use a Dehumidifier to Reduce Relative Humidity to improve the overall performance of your swamp cooler. Another option is to open additional windows, allowing humidified air to escape and clean cool air to enter the vents to cool your home.


An evaporative or swamp cooler can operate all day. It will cost around $3.19 per day, including power and water usage—the paint quality of a swamp cooler when the humidity level is less than 50%. After running your swamp cooler for twenty-four hours, you will notice that it blows cooler air at the lowest humidity tiers. Even though it uses about 25% more power, the cost of running an air conditioner all day can be comparable.

Swamp coolers outperform air conditioners in drier climates with less than 50% relative humidity. In drier climates, air conditioners are more expensive to install and must run for more extended periods. Running your swamp cooler continuously for twenty-four hours is not a problem. You need to ensure that it has sufficient water to operate correctly.


How long can you leave an evaporative cooler running?

During a Heat Wave, Use Evaporative Air Conditioning. It can run indefinitely until the heat wave passes. If the nighttime temperature is in the mid-20s, set the air conditioner to fan-only mode, or leave it on if it is close to 30 degrees.

At what temperature do evaporative coolers become ineffective?

High temperatures (85°F or higher) and low relative humidity are ideal for evaporative coolers (below 50 percent). Evaporative coolers are least effective in conditions of low temperature (below 75°F) and high humidity (above 60% relative humidity).

When using evaporative cooling, how many windows must be opened?

Most experts recommend opening windows farthest away from air ducts or vents. You should aim to make an opening twice the size of the existing vent opening.

Do evaporative coolers use a lot of energy?

Because only the fan and water pump use energy (200 to 400 watts), power consumption is usually low. However, depending on the features and capacity, this can vary greatly, and there are domestic appliances that consume 2kW or more.

Is ice water better for evaporative cooling?

Despite being closer to the boiling point, where it evaporates much faster, cooling to room temperature water is more effective.


About Author

Mobeen Shahid

Mobeen Shahid

Mobeen Shahid is a Mechanical Engineer with two years of experience in the HVAC industry. His passion is analyzing HVAC issues, and he works relentlessly to devise customized solutions. He has been in the industry long enough to know the ins and outs and ensures that areas are optimally heated, cooled, and ventilated.

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