- Temporarily place houseplants outside or concentrate them in one room.
- Plants release moisture vapor into the air. Especially when you have lots of plants, their role in home humidity levels can be significant. Also, make sure not to overwater them.
- Insulate crawl spaces with a plastic vapor barrier.
- Ensure that exhaust fans in kitchens, bathrooms, and laundry rooms vent to the outside. Installing vents and attic fans can help too.
- Make sure to clean air-conditioning drain lines and drip pans and keep them unobstructed.