I'm thinking about buying some highland nepenthes, but some of them need a big temp drop at night, like N. Rajah. Can I achieve this without using humidifiers or other electronic devices? I live in TX where the temp is almost the same 24/7 and I don't have a basement to move it to (we live in a one story house). I was thinking about using a cooler (the type you fill with ice to keep your sodas cold) and putting a few ice packs in it. Any suggestions would be appreciated.