From Clammy to Comfortable: Tackling Bathroom Humidity

A well-thought-out plan of attack—whether it’s humidity sensors or getting your fan size right—is the difference between soggy ceilings and splendid conditions.

Humidity. It’s the stuff of rain forests, delightfully foggy mornings, and muggy summer afternoons. It’s what makes your bare legs stick to leather seats in the summer. It’s also what keeps your bathroom from drying—ever.

What’s good for jungle greenery isn’t good for your bathroom. Dank, soupy conditions can wreak havoc on your bathroom, contributing to wear and tear and hazardous mold damage.

In the bathroom, steamy windows and slippery-wet floor tiles are a fact of life. A well-thought-out plan of attack—whether it’s humidity sensors or getting your fan size right—is the difference between soggy ceilings and splendid conditions.

Keeping bathroom humidity in check is crucial. The only question is: how?

Here are a few tips:

1. Invest in Humidity Sensors

Some family members, especially kids, forget about fans entirely. Let’s face it: that warped paint and moldy grout didn’t happen overnight. Bathroom fans are a great way to keep humidity in check when use frequently. That being said, it’s easy to go overboard, with a fan blaring day and night—and blowing through stacks of energy and money.

If traditional solutions aren’t cutting it, a humidity sensor is a great way to shore up your moisture defenses. Programmable to a specific level of moisture—say 65 percent relative humidity—a sensor can automatically trigger your fan whenever your bathroom enters the danger zone. Once back to a normal, human-appropriate range, the fan turns off—no switches, or guesswork, required.

2. Venting, for Success

Improperly vented bathrooms encourage humidity and blossoming mold. Taking the time to vent your fan outdoors—through the roof, soffit, or sidewall—will help you avoid even greater costs down the road.

Regular diagnostics help too. Checking that your fan system is functioning correctly goes a long way. Obstructions in the fan grill, or vent system, can mean dank, humid conditions—no matter how long the fan runs.

3. Become a Fan (of Fans)

If your fan isn’t cutting it, mold is a real possibility. Selecting the right fan size is vital to your comfort, and the future health of your bathroom. The CPM rating (cubic feet per minute) on a fan tells you how much air can be moved per minute. Basically, bigger bathrooms need a higher CPM. It’s best to check a CPM size chart to make sure your fan stacks up.

4. Go Ductless

Besides delivering delightful, on-demand comfort, a ductless heating and cooling system also dehumidifies the air. Installing an indoor unit close to a troubled bathroom can take some of the load off of the ventilation system, and keep adjacent rooms a little dryer.

By passing warm air over a condensation coil, ductless systems remove water and humidity from the air. The collected condensation is then piped outside, away from the home. So you’ll stay cool–not clammy.


With a little elbow grease and the right technology, humidity doesn’t stand a chance. With the right tools, you can keep humidity where it belongs: out of your bathroom.

This article and its content are sponsored by Mitsubishi Electric US Inc., Cooling & Heating Division. 

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