When humidity levels are high, many homeowners turn to dehumidifiers to help maintain a comfortable indoor environment. But is it safe or advisable to run a dehumidifier continuously, 24 hours a day? Here is a comprehensive look at the pros and cons of running a dehumidifier round the clock.
Quick Answers
Can you run a dehumidifier 24 hours a day? The quick answers are:
- It is technically possible to run most dehumidifiers continuously without causing damage to the unit.
- However, it may not be the most efficient or cost-effective approach in all cases.
- Factors like humidity levels, dehumidifier capacity, energy costs, and maintenance should be considered.
- Running a dehumidifier non-stop can result in over-drying of indoor air which can have negative effects.
- A better approach may be to use a dehumidifier intermittently or use a humidity-sensing dehumidifier.
- Proper dehumidifier maintenance is important for continuous operation to prevent issues like icing up.
Is it Safe to Run a Dehumidifier 24/7?
Most dehumidifiers on the market today are designed for continuous operation, meaning they can safely run 24 hours a day without damaging the unit or causing hazards. However, there are some caveats to consider:
- Capacity – A dehumidifier must be appropriately sized for the space to operate efficiently in continuous mode. An undersized unit will struggle to keep up.
- Maintenance – Regular cleaning and filter changes are a must for continuous use to prevent issues like freezing up.
- Automated shutoffs – Many dehumidifiers have auto shutoff functions when the tank is full or when frost builds up on coils.
- Wear and tear – Parts like compressors and fans can wear out faster with 24/7 operation.
- Electricity – Leaving any appliance plugged in continuously poses some minimal fire hazard.
Checking the manufacturer specifications can determine if a particular dehumidifier model is suitable for continuous operation. Some are designed for 24/7 use, while others are intended only for intermittent use.
Pros of 24 Hour Operation
Running a dehumidifier continuously has some potential benefits:
- Maintains constant humidity levels – Keeping the dehumidifier always on means your home’s humidity level never rises, providing consistent comfort.
- Prevents mold & mildew growth – Keeping humidity down to 40-50% RH inhibits mold, bacteria, dust mites.
- Protects home & valuables – Excess moisture can damage walls, warp wood, corrode metals, ruin electronics.
- Fewer cycles on/off – Reduces wear & tear from compressors and fans constantly switching on/off.
For those with significant humidity issues or mold concerns, keeping a dehumidifier running at all times can be the best way to maintain healthy indoor air quality.
Cons of 24 Hour Operation
However, continuous dehumidifier operation also has some downsides to consider:
- Higher electricity costs – Dehumidifiers can use substantial amounts of energy when run continuously.
- Noise – Dehumidifier motors and fans generate noise which may be disruptive at night.
- Over-drying – Air dried out too severely can cause dry skin, sinuses, and breathing issues.
- Forgetful tank draining – Water tanks may overflow if not emptied regularly.
- Higher maintenance – Air filters will need frequent changes with 24/7 operation.
Finding the right balance is important. Having a dehumidifier working non-stop can potentially do more harm than good if humidity levels go below recommend thresholds. Moderation is key.
Dehumidifier Capacity Considerations
When selecting a dehumidifier to run continuously, choosing a unit with the proper capacity for your space is crucial:
- Oversized dehumidifier – Will work too aggressively and over-dry the air.
- Undersized dehumidifier – May run continuously but still not lower humidity sufficiently.
- Just right – Able to keep humidity in the ideal 40-50% range with continuous operation.
A generator typically needs at least 1 pint capacity for every 500 square feet of space. So for a 1000 sq ft home, look for a 20-25 pint dehumidifier or more. Get a unit rated for your home’s actual square footage for optimal continuous performance.
Dehumidifier Energy Use
Electricity usage should be an important factor in deciding whether to operate a dehumidifier 24/7. A typical dehumidifier can use 300-700 watts per hour when running. This equates to a lot of kilowatt-hours over the course of a month of continuous use. The costs can add up, especially during summer peak usage months.
Cost to Run a Dehumidifier Continuously
| Dehumidifier Size | Wattage Used | Hours/day | Kilowatt-hours | Cost @ $0.12/kWh |
|---|---|---|---|---|
| 30 Pint | 660 Watts | 24 hrs | 15.84 kWh | $1.90/day |
| 50 Pint | 760 Watts | 24 hrs | 18.24 kWh | $2.19/day |
| 70 Pint | 850 Watts | 24 hrs | 20.4 kWh | $2.45/day |
Based on average electricity rates, operating a mid-sized 50-pint dehumidifier continuously could add over $65 to your electric bill over the course of a month. The costs add up over the summer or an entire year. Whether this is acceptable depends on your budget and how severely you need humidity controlled.
Alternatives to 24/7 Operation
If you are concerned about the downsides of running a dehumidifier continuously, there are alternatives:
- Intermittent use – Run the dehumidifier only during the hotter, more humid parts of the day.
- Humidity-sensing mode – Units switch on and off based on a set humidity percentage.
- Use a hygrometer – Identify the specific times humidity rises excessively.
- Improve home ventilation – Install bathroom & kitchen fans to remove moisture at the source.
- Seal leaks and cracks – Stop moisture from entering through damaged windows, doors, roofs.
You don’t necessarily need a dehumidifier operating 24/7 to maintain healthy humidity levels. Periodic use when humidity spikes can often get the job done just as effectively in many homes.
Dehumidifier Maintenance with 24/7 Use
To operate a dehumidifier continuously without issues requires diligent appliance maintenance:
- Clean filters – Dirty air filters reduce dehumidifier efficiency and can cause freezing up.
- Clear debris – Remove dust, dirt, and debris from coils, fins and grilles.
- Prevent leaks – Repair any drips or leaks in water hoses or tanks.
- Check airflow – Make sure nothing blocks airflow to and from the dehumidifier.
- Replace worn parts – Have technicians replace any worn-out fans, switches or compressors.
Follow the manufacturer’s suggested cleaning and maintenance schedule for your dehumidifier model. Periodic upkeep is essential to prevent malfunctions and keep it working efficiently 24/7.
Ideal Home Humidity Levels
The level of humidity considered comfortable in a home varies depending on climatic conditions and personal preference.
| Humidity Range | Comfort Level |
|---|---|
| 30% – 35% RH | Very dry |
| 40% – 50% RH | Ideal comfort range |
| 50% – 60% RH | Slightly humid but acceptable |
| Over 60% RH | Excessively humid |
A relative humidity range of 40-50% is generally recommended by most experts for comfort and health, minimizing issues like allergies, asthma, and mold growth. But personal preference for more humidity during cold dry months or less humidity in hot humid climates can adjust those target levels.
Potential Health Issues from Low Humidity
While excessive humidity has clear detriments, over-drying indoor air with a dehumidifier can also cause problems:
- Dry, itchy skin
- Cracking and bleeding lips
- Irritated nasal passages and throat
- Worsened respiratory issues like asthma
- Static electricity sparks
- Peeling wallpaper or paint
- Furniture damage like warped wood
If you notice these symptoms appearing when your dehumidifier is running constantly, the air has likely become too dry. Turn off the dehumidifier and allow humidity to rise back up to 40-50% RH.
Conclusion
Operating a dehumidifier continuously 24 hours a day is technically feasible in most cases – but whether it is practical or beneficial depends on several factors. While non-stop use can control humidity, the resulting over-drying, energy costs, noise, and maintenance may make running a dehumidifier intermittently a better solution for some homeowners. Carefully weigh the pros and cons of 24/7 operation for your specific needs.