One trick to raise humidity if you have any kind of propagation dome is to mist the inside of the dome every few hours or as often as possible then place the dome back over them.
As far as heat goes, my experience is that unrooted clones can take more heat than a full-sized plant. You might try to spray the leaves with a wilt-proofing agent to keep them from transpiring as much....? It might just get ya through till the temperatures swing in your favor.
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