No, you do not need one in every room. Humidity equalizes throughout reasonably sealed, open-concept homes. Instead, place portable dehumidifiers in problem areas with high moisture, such as basements, bathrooms, or laundry rooms, or use a whole-house dehumidifier tied into your HVAC system.
No, standard air purifiers do not physically remove moisture from the air. They merely cycle air through filters (like HEPA and carbon) to trap pollutants. However, the continuous airflow from the device's fan can increase evaporation from your skin and nasal passages, making the air feel drier.
Yes, a dehumidifier can be highly beneficial for managing COPD, provided your home has high humidity. It makes breathing easier by lightening the air and preventing mold and dust mites, which are common respiratory triggers.
Yes, dehumidifiers are supposed to reduce excess moisture, but sometimes they get a little overzealous. If the humidity level is set too low, it can leave you with itchy skin, dry eyes, or a scratchy throat. And while you can always slather on lotion or keep a glass of water nearby, it's hardly a long-term solution.
Rock salt: Place bowls of rock salt in damp areas like closets or basements. It draws in moisture and requires no energy. Charcoal briquettes: Like rock salt, they absorb humidity and can be placed discreetly around the home.
5 places to never put a dehumidifier – experts urge you to avoid these spots or risk making your damp problems worse
Signs You Need a Dehumidifier
#1 – The Best Overall – Midea Cube
Simply put, the Midea Cube (MAD50S1QWT) is by far the best dehumidifier we've tested as of the writing of this guide in spring 2026. It is unequivocally the best dehumidifier on the market today.
Avoid using a dehumidifier if your indoor relative humidity (RH) is already between 30% and 50%. Running one below this range, in freezing temperatures, in drafty open-window scenarios, or in extremely dry climates will waste energy and dry the air to unhealthy levels.
Neither extreme dry nor extreme humid air is best for COPD; the ideal environment is moderate humidity, typically between 30% and 50%. Excessive humidity makes air feel heavy and harder to breathe, while too little humidity dries out airways and causes irritation.
Some of the main things you'll be advised to do are outlined below.
Neither is universally "better" because they treat different problems. Air purifiers are essential for preventing symptom flare-ups caused by airborne irritants, while humidifiers provide comfort by soothing dry, irritated airways.
The ideal indoor humidity level for sleeping is between 30% and 50%. Maintaining this range helps prevent dry skin, irritated sinuses, and congestion, all of which can disrupt restful sleep. Too little humidity can dry out airways, while too much can promote mold growth and dust mites.
Allergies: Humidifiers can add moisture to dry air that contains allergens and help you breathe easier by reducing sinus inflammation. They can even help with non-allergy sinus problems. Dehumidifiers can help dry excessively moist environments where allergens like dust mites and mold can thrive.
Run a dehumidifier during the warm, humid months of spring, summer, and early fall. Use it based on need during winter, turning it off if indoor humidity falls below 40%. The most effective rule of thumb is to rely on a Hygrometer and run the unit whenever your indoor relative humidity (RH) exceeds 50%.
Signs of High Humidity
If you're spotting mold in corners, on walls, or in the bathroom, your home's humidity is too high. Musty Smells: A persistent musty smell is a dead giveaway that there's too much moisture in your home. Ideally, you want to keep your home's humidity between 40% and 60%.
If a dehumidifier is kept operating for an extended period, it may dry indoor air to the point of causing dry skin, respiratory problems, and damage to wooden furniture. In very low humidity, houseplants may also endure problems.
The single most important factor in dehumidifier placement is positioning your unit in a central, open area of your basement. This allows for optimal air circulation and ensures even moisture removal throughout the entire space.
Yes, running a dehumidifier does consume electricity and will increase your electric bill, typically costing between $𝟏𝟓 and $𝟒𝟎 per month depending on your usage and local rates.
They're also useful in winter in cooler areas like basements or crawl spaces, where condensation can form on windows and cold surfaces. Essentially, use a dehumidifier whenever indoor humidity consistently exceeds 50% or causes discomfort.
To draw moisture out of a room, use a dedicated dehumidifier, or natural absorbers like DampRid, calcium chloride, and baking soda. Active methods include ventilation with fans, air conditioning, and placing desiccants like silica gel in enclosed spaces.
So, why is your house so humid, and what causes high humidity indoors? The short answer is that more moisture is being trapped indoors than your HVAC system can remove. Air leaks, poor ventilation, or an air conditioning system that's not working correctly can all exacerbate the issue.
The cheapest and most effective homemade moisture absorber uses calcium chloride (sold as bulk driveway ice melter) combined with a simple two-bucket or colander-over-bowl system. This DIY approach costs a fraction of commercial products like DampRid and works identically to pull water from the air.