with a PVC enclosure you have two options to raise ambient temps: 1. heating the room, or 2. RHP.
i used to heat my room to 77° F and that kept my T8 at a steady 79-80° F. if you're going to go that route, you'll need to just let the heat run and spend some time monitoring temps to get the enclosure dialed in; what works for me might not work for you.
what enclosure do you have? sorry if you've posted pics or explained this before. RBI makes many different size RHP that you might be able to use with your current set-up; have you looked into that? if you're already thinking about upgrading, this might not be the most economical option, so i understand if you don't want to do this.
EDIT: regarding humidity, you might need to let the enclosure "air out" a bit; open the enclosure up and let some air pull that moisture out.
also, where are you located? i'm dealing with the same issues as you: high humidity all of a sudden and i have NO clue why, and dropping temps outside causing me to make adjustments to my tub and 20gal.
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