I found some 62% humidipak's, cheap.
Define ambient temp. Without temp control and insulation the range is up to 40 degrees a DAY! Central valley, ca. Just shy of desert. I can keep the temp whatever I want. 72 degrees is a LOT cheaper than 75. I have to use electric to heat. LOL. We're talking summers of 110 degree days, and 70's in the evenings in the summer to 80's high, 40's low in the winter. Again... It only stays it's warmest, 3 to 4 hours a day. Same with the coolest.
ALWAYS, jack for humidity. Summer, 13%, winter, see above.
So I can control temp but not humidity. I wondered about just adding a bucket of water, but didn't know if that'd be enough. I'm originally from Michigan so I'm familiar with literally 100% humidity. But I thought it would take 5 lakes to generate that much moisture

I SO don't miss that place!
I'll let you know how the paks work. Also just ordered a hygrometer.
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