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How can I lower the humidity in my home?

We have a gas boiler furnace, no duct work, no AC. I am running a dehumidifier nonstop to maintain 50% humidity in my living area (outdoor temp 30F, indoor temp 70F). This morning, my son's bedroom had 67% humidity!

We installed a bathroom fan and soffit vents in over the summer. II wonder if we need more.

Our basement is 36%. (The entry is from my garage.) Do I install floor vents from the main living area into the basement? Will this create a back draft for my gas appliances?

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