Dehumidifiers are increasingly popular for maintaining comfortable and healthy indoor environments. But if you’re considering running one around the clock, you might be wondering how much it will add to your energy bill. In this post, we’ll explore what dehumidifiers are, how they work, and break down the costs of using them continuously.
What Is a Dehumidifier?
A dehumidifier is a household appliance designed to reduce the level of humidity in the air. High humidity levels can lead to problems like mould growth, dust mites, and musty odours. A dehumidifier works by extracting excess moisture, leaving the air drier and more comfortable.
Dehumidifiers come in various sizes and capacities, from compact models for small rooms to larger units capable of dehumidifying entire basements or homes.
What Does a Dehumidifier Do?
Dehumidifiers improve indoor air quality and help prevent structural damage caused by excessive moisture. They work by drawing in humid air, cooling it to condense the moisture into water droplets, and releasing dry air back into the room.
This process not only reduces dampness but also creates an environment less hospitable to allergens like mould spores and dust mites. Dehumidifiers are particularly beneficial in homes located in humid climates or areas prone to condensation.
How Much Energy Does a Dehumidifier Use?
The energy consumption of a dehumidifier depends on factors like its size, efficiency rating, and the level of humidity in your home. Dehumidifiers are rated by their wattage or energy usage per hour. On average:
- Small dehumidifiers (10-20 litres/day): Use 150–300 watts per hour.
- Medium-sized dehumidifiers (20-30 litres/day): Use 300–500 watts per hour.
- Large dehumidifiers (30+ litres/day): Use 500–700 watts per hour.
The energy efficiency of the unit, measured by its energy factor or integrated energy factor (IEF), also impacts costs. Newer models with higher IEF ratings are typically more cost-effective to run.
How Much Does It Cost to Run a Dehumidifier 24/7?
To estimate the running cost, consider the following formula:
Cost (£) = (Wattage x Hours of Use x Electricity Rate) ÷ 1,000
Let’s assume the electricity rate in the UK is 34p per kWh (based on average 2024 prices):
- Small dehumidifier (200W):
- 200W x 24 hours x £0.34 ÷ 1,000 = £1.63/day
- Monthly cost: £1.63 x 30 = £48.90
- Medium-sized dehumidifier (400W):
- 400W x 24 hours x £0.34 ÷ 1,000 = £3.26/day
- Monthly cost: £3.26 x 30 = £97.80
- Large dehumidifier (600W):
- 600W x 24 hours x £0.34 ÷ 1,000 = £4.90/day
- Monthly cost: £4.90 x 30 = £147.00
These estimates can vary depending on the unit’s actual power consumption and how often it cycles on and off.
Tips to Reduce Running Costs
- Choose an energy-efficient model: Look for dehumidifiers with high IEF ratings or Energy Star certifications.
- Use it strategically: Instead of running the dehumidifier 24/7, use it only during peak humidity times.
- Regular maintenance: Clean filters and ensure proper airflow to maximise efficiency.
- Consider a timer or smart controls: These can help limit operation to specific hours.
Is It Worth Running a Dehumidifier All Day?
While running a dehumidifier 24/7 can be costly, the benefits it provides—such as preventing mould and improving air quality—may outweigh the expense in particularly damp homes. If continuous operation isn’t necessary, setting it to run intermittently can strike a balance between comfort and cost.
The cost of running a dehumidifier 24 hours a day depends on the unit’s size, efficiency, and your local electricity rates. By choosing the right model and using it wisely, you can enjoy the benefits of a healthier home without breaking the bank.
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