Humidity problem. Help?

[lla]

I got two new snails a couple weeks ago and they've started being less active, almost in hibernation, since I changed them into a bigger tank with more ventilation. This bigger tank sadly doesn't retain humidity well. I spray the tank at least 3-4 times a day yet it still isn't enough. Are there any tools I can buy to help with this problem? I know humidifiers for reptiles are available but from what I've read they create mist which I'm not sure would work? I'm quite new to snail keeping and adore my two little babies so any help figuring this out would be great! They are two baby garden snails. 

[Liguus]

Reptile humidifier work good, even larger home humidifiers if you want to glue a tube to the output. You can also plastic wrap 80% of the lid to help keep humidity in

[lla]

I'll definitely try out the plastic wrap now and try to get a humidifier as soon as possible. Thank you for the help!