you don't want your humidity above 40-45% 60% will definitely promote powdery mildew, and mold...possibly budrot
Jorge teaches on the side of caution, and also they don't want tyou to give up...LOL, because you cannot get % to 40.

when they say 40-60...they mean 60% is as high as you can go without stopping production. I would never run my flower room at 55-60 % NEVER!!!

Go to ebay and spend 80-90 bucks on a used or refurbished model. I did, and my humidity is a constant low 40's. get a 30 pint, with an external connection...so you can plumb drainage. If you cannot afford this then you cannot afford to grow. I am not being mean...I am saying in the end yield and quality will really take a beating, if you do not get your humidity under control. You will end up losing time and $$$ well above the cost of a de-humidifier. Peace

PS...For those of you who need Zandor to confirm this...He did...to me.

I almost forgot. you will continue to have problems if you don't get better ventilation. Something I didn't mention about dehumidifiers...They cause heat, just like the back of an AC unit, or a "frig". Peace