An RV accessory you can’t live without is a hygrometer. Check it out on Amazon. It’s important to determine what the humidity level is inside your RV so you can keep it at its ideal level.  Thermometers and hygrometers are inexpensive and you can use them for this.  Make sure your indoor space has a relative humidity between 30% and 50%.  After you’ve determined that your humidity level isn’t okay, try these things:

Turn on the air conditioner.

When you leave RV windows open in humid climates, air conditioners remove moisture from the air.  If it’s hot enough to need an air conditioner, you might be able to fix the problem on your own.

Let some fresh air in.

If the air inside is more humid than the air outside, a window or ceiling vent can help.  A ceiling vent will give you a lot more air flow than just one window because hot air rises.  It’s especially important to breathe through your nose when you’re showering, cooking, or releasing pressure from an Instant Pot.

Boost airflow.

You can even out the air temperature in your RV by running a fan.  If you have a window or vent open, a fan will help humid air escape faster.

Dehumidify the room.

Dehumidifying your house is better than cooling.  There are lots of dehumidifiers out there in different sizes and prices, so choose one that fits where you’ll use it.  When the humidity is higher, you won’t have to empty the water container as often.  If you don’t have space for one the size you need, you could start with one and add one later.

Absorb moisture.

Boondocking and storing RVs with crystal moisture absorbers like Damp Rid are great.

Reduce water vapour.

Try laundry at the laundromat, shower at the campground, and cook outdoors as much as you can if you’re still having trouble. All of these things raise humidity and cause RV windows to fog up.