Excess moisture in the house

[Coralgurl]

Im sure there's been a number of threads on this subject already, I'm jus not good at searching....

My daughter pointed out yesterday that we have mold forming on the windows ledges in our kitchen. Checked all the windows and found they all have some. The windows are trimmed in plastic, not wood so easy enough to clean up but now concerned about areas we can't see.

Are there any alternatives to an HRV system to help deal with the moisture in the house from the tanks? Both my tanks are in my living areas - kitchen and former office and can not close them off.

Thanks