If you have a air exchanger it makes a huge difference because the humid air in the house is constantly being replaced with fresh air. An HRV is in my opinion the best option if you had the funds. I didn't have the funds so that's why I installed just a bathroom fan. It's not my furnace room so I think I'm pretty safe. I also have a vent fan in the house that I can manually turn on if I want. With my experience with my old house, I opted to go preventative rather than deal with it after the fact. I was dealing with mold issues at my old place. This was mainly in the winter where the windows would just drip and it would drip down the walls and cause the baseboards to mold. Long story short, if you have the funds, get an HRV. You can get one for well under a thousand dollars and really easy to install with minimal tools. Hope this helps.
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