If you can either bump up that ambient temp to 80F, or drop the humidity slightly, this will lessen the chance of a respiratory infection. It should not ever drop below 75F!

On that note, my BP spends a good deal of time in his cool hide/side (which is around 78F - my humidity is a bit on the low side because of the time of year), rather than his warm hide/spot (90F). Typically he is not in his warm hide unless it drops below 78F; otherwise he is laying across his big branch or overturned plant pot as soon as the sun dips low in the sky!