@Minnie72, all you really need is a dry, warm place to allow your plumeria to callus. A little air-movement will help. Light is not even necessary. I happen to have a greenhouse for this, but there are dozens of areas in homes that would work well. Some folks apply their rooting hormone when they first cut the plant (after there is no more sap oozing from the cut end) and some apply the hormone after the callus is formed. I have done it both ways and see no difference. I don't even know that there is that much of an advantage when using a rooting hormone, at least when it comes to plumeria. There should be a fungicide in the hormone, so this would seem to help prevent fungal-induced rot.
It takes me two weeks for my plumeria to callus in the winter but only a week in the spring/summer. But my greenhouse becomes a "hothouse" in the spring and summer months. On sunny days, it'll get 115-120 F inside. That's with 70% shade-cloth, doors and vents open, and three fans running.
