An HRV really is the answer you're looking for, and it will have benefits that go far beyond just controlling humidity when the weather is cold. Now that I have one, I'd never live in a house around here without one - even if I didn't have tanks - they're that useful.
Maybe keep the idea in your back pocket and look into it eventually. You could go DIY to keep costs down, if that was an option.
Maybe run the summer fan more often in the meantime to keep the air stirred up.
A dehumidifier can help but they are noisy and expensive to run and only offer a localized solution (and the humidity bounces back instantly when they're off). But it will help out in the meantime.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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