When winter arrives, most of us think about humidifiers: devices that add moisture to combat dry, heated indoor air. So the idea of running a dehumidifier, which removes moisture, can seem counterintuitive.
Yet for many homes, it can actually be a good idea. In this article, I’ll explain why, and when it might not be necessary. First, I’ll walk you through the main potential benefits of using a dehumidifier in winter, then explore the potential drawbacks.
The pros of using a dehumidifier in winter
1. Tackling condensation on windows and walls
When warm indoor air meets cold surfaces like windows and external walls, moisture in the air condenses into water droplets. That’s what leads to that familiar sight of wet windows on winter mornings.
Persistent condensation creates the conditions for mould growth, which can damage paintwork, window frames and wall finishes over time. A dehumidifier reduces the amount of moisture in the air before it reaches those cold surfaces, helping to prevent condensation forming in the first place. For homes that regularly wake up to wet windows in winter, this alone can justify using one.
2. Making your home feel warmer
Lowering the moisture content in the air should mean your heating system doesn’t have to work so hard to warm your home. Plus, dry air feels warmer than humid air at the same temperature. By lowering indoor humidity, you may find you can turn your thermostat down slightly without feeling colder.
In some homes, this can lead to modest energy savings over winter, even once the electricity used by the dehumidifier is taken into account. The exact benefit depends on insulation, heating efficiency and local climate, but in moderately humid winter conditions, the effect can be noticeable.
3. Preventing dampness in problem areas
Certain spaces are prone to damp, regardless of the season. Basements, utility rooms, bathrooms without windows and poorly ventilated areas can all accumulate moisture in winter from showering, cooking, drying laundry indoors and everyday living. In modern, well-insulated homes, this problem can become worse rather than better.
In such cases, a dehumidifier can prevent that lingering dampness that leads to musty smells, mildew and mould, and over time, damage to furnishings, finishes and stored belongings. These issues develop slowly, but repairs can be costly in the long term.
The cons of using a dehumidifier in winter
Despite the benefits, using a dehumidifier in winter isn’t always a good idea. Here are some of the biggest potential problems with doing so.
1. Risk of overly dry air
Winter air is often dry to begin with, and heating systems tend to reduce humidity further. Adding a dehumidifier can push levels too low. Once indoor humidity drops below about 30%, air can start to feel uncomfortably dry.
Signs that your air is too dry include static electricity, irritated eyes and sinuses, dry skin and cracked lips. Houseplants and wooden furniture can also suffer. This is why it’s important to only use a dehumidifier when it’s actually needed.
A simple hygrometer – an inexpensive device that measures relative humidity – takes the guesswork out of the decision. (Most dehumidifiers have one of these built in.) If your home regularly sits below 40% humidity in winter, you’re unlikely to benefit from dehumidification at all, and might even be better off with a humidifier instead.
2. Reduced efficiency in cold spaces
Most domestic dehumidifiers use compressor technology, which works best at normal room temperatures. In cold environments such as unheated basements, garages, or conservatories these models become far less effective. In such spaces, desiccant dehumidifiers perform much better and continue to work at lower temperatures. The trade-off is that they typically use more electricity.
3. Increased energy consumption
While drier air can help a home feel warmer, dehumidifiers still use electricity. Over the course of a winter, this can add noticeably to energy bills, particularly if the appliance runs continuously.
Modern units with built-in humidistats help by switching off once a target humidity is reached, but the cost-benefit equation varies from household to household. In homes without condensation or damp problems, running a dehumidifier in winter may simply be an extra expense with little return.
4. Sometimes, it’s just not necessary
If your home is well ventilated, heated consistently and doesn’t suffer from condensation or damp, you may not need a dehumidifier at all in winter. Simple habits such as ventilating after cooking or showering and avoiding drying laundry indoors may be all you need to keep humidity at healthy levels.
Conclusion
So, should you use a dehumidifier in winter? The short answer is: it depends.
Start by measuring your indoor humidity, using a hygrometer. If levels regularly sit above 50–60%, especially if you notice condensation, musty smells or damp patches, a dehumidifier is likely to help. If humidity is consistently below 40%, using one risks creating overly dry, uncomfortable conditions.
Climate also plays a role. Homes in cold, humid regions often benefit from winter dehumidification, while those in drier winter climates usually don’t.
It’s also worth remembering that dehumidifiers and humidifiers aren’t mutually exclusive. Some households use a dehumidifier in damp areas like basements, while running a humidifier in heated living spaces to maintain comfort.
The key is to remain flexible and responsive. Winter humidity isn’t fixed; it changes with the weather, heating patterns and your daily activities. So keep monitoring your humidity levels, respond accordingly, and you’ll be far more likely to strike that comfortable middle ground.
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