How long do dehumidifiers last? If you own one of these moisture-busting machines, you've probably asked this question. Dehumidifiers can be expensive, so it's worth knowing when yours might reach the end and what you can do to make it run longer.
Just like any other appliance in your home, even the best dehumidifiers have an inevitable lifespan. However, there are steps you can take to help them run efficiently for longer – whether it’s using auto mode initially to prevent motor strain or thoroughly drying the unit after cleaning to prevent mould build-up.
Below, we explain how long dehumidifiers typically last (spoiler: there’s a difference between compressor and desiccant models) – plus expert advice on how to prevent them from burning out prematurely.
How long do dehumidifiers last?
Provided you treat them with proper care and follow standard dehumidifier maintenance advice, dehumidifiers can last between five and 10 years, according to Katie Lilywhite, a dehumidifier expert at AO.
However, it's worth bearing in mind that desiccant dehumidifiers can wear out faster than compressor models, as their absorbent material degrades over time. The lifespan also depends on the quality of your device, how you store it and how often you use it.
Katie Lilywhite is a category buyer at AO.com with expertise across various appliances, including dehumidifiers.
How to extend your dehumidifier's lifespan
1. Go easy after summer
If your dehumidifier has been sitting in a cupboard all summer, you'll want to go easy the first time you use it again. Rather than blasting it on maximum power, Katie Lilywhite recommends running it on gentle auto mode first. This will prevent straining the motor, causing wear and tear that could shorten its lifespan.
She adds, “You’ll also need to give it a little bit of TLC. Clean the dehumidifier's filter, as dust can build up in storage, and similarly, wipe down the exterior to prevent any further dust from hindering your appliance. Now’s the perfect time to check your dehumidifier’s water tank – give it a once-over and make sure it’s dry and mould-free.”
2. Keep the windows closed
If you keep the windows open while using your dehumidifier, not only are you increasing the dehumidifier's running costs, but you’re also forcing your unit to work much harder – which can eventually shorten its lifespan.
Katie explains that your dehumidifier will be constantly battling against fresh, damp air being blown in, which can have “detrimental effects” on the compressor, fan and motor (as well as your bank account!)
3. Store your dehumidifier correctly
If you’re not planning to use your dehumidifier for a while, it’s important to store it properly to prevent any damage. Laura Bradbury, Head of eCommerce at VonHaus, recommends emptying and drying the water tank, cleaning or replacing the filter, and wiping down the exterior before packing it away.
She adds, "Store it somewhere cool, dry and out of direct sunlight – a cupboard or utility room is ideal. Avoid garages or sheds, as damp conditions can damage the internal parts over time."
Laura Bradbury is Head of eCommerce at online homeware and garden retailer Vonhaus, and is responsible for developing and growing the brand.
How do I know when to replace my dehumidifier?
Wondering whether it’s time to repair or replace your dehumidifier? Here are some signs it might be broken:
- It fails to lower humidity
If your unit runs continuously but fails to reduce humidity, this usually signals a problem with the compressor or refrigerant, explains Viktor Velikov, director at Elserve. "The appliance may seem to operate normally, yet moisture is not being removed because refrigerant pressure has dropped or the compressor valves are worn," he says. "These faults cause the system to overwork while performance steadily falls, showing that failure is imminent." - Reduced airflow or uneven cooling across the coils
Reduced airflow or uneven cooling is another indication that your dehumidifier may be on its way out. If that's the case, Viktor recommends stopping operation, cleaning or replacing the filters, and having a professional inspect it. "Prompt maintenance restores efficiency and prevents the compressor from burning out – avoiding a complete breakdown and higher repair costs," he says. - It makes unusual noises
If your dehumidifier is making peculiar sounds – like rattling, humming or buzzing – it could be a sign that it’s about to expire or that there’s an issue that needs to be resolved. - It has a musty smell
A musty smell could be a sign of mould or mildew building up inside, which is why regular cleaning is essential.
Costing just 6p per hour to run (based on 28.62p/kWh), this energy-efficient dehumidifier is highly recommended by our testing team. It also comes with a free HEPA filter to purify your air.
Viktor Velikov is the director of Elserve and has over 22 years of experience in the domestic appliance industry. At Elserve, he leads a trusted team delivering efficient, reliable home appliance repairs across Greater London – from washing machines and dishwashers to fridges and cookers.
Will running a dehumidifier all day damage it?
As long as you keep your dehumidifier well-maintained, it won’t be damaged by running it for long periods, assures Laura Bradbury, Head of eCommerce at VonHaus.
However, she advises that eight to twelve hours per day is usually enough for most homes (depending on humidity levels), and that short bursts often work better than running it all day long.
As long as you take good care of your unit, there's no reason a high-quality model shouldn't last between five and ten years. By avoiding common dehumidifier mistakes, you can help it last even longer without needing early repairs or replacement.
