Seedlings won’t mind 86 F as long as you don’t let them dry out.
At the top of my tiny tent 24 hour High 85 F Low 81 F, Humidity High 70% Low 63%.
My plants don’t seem to mind those temps at all.
High temps with high humidity seems to be OK for most sativa strains.
My humidity is usually a bit lower, but my plants got their fabric pots rinsed and soaked and new wet Coco fibers added to their soil mix to fill my plants 3 gal pots up properly.
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