A fan is not going to keep whiteflies away unless you have it set to "Hurricane Force", and that won't be too good for the plants. Continual vigilance and regular spraying will be needed to prevent a whitefly buildup.

Being a sucker, I have two abutilons growing indoors, one under fluorescents and the other in a sunny window. Past experiences have not been good, but there's always the chance I'll discover the magic formula this time out.

If bringing large abutilons indoors I'd plan on cutting back heavily, spraying to make sure few if any pests come in with the plants, and going easy on the water and fertilizer for awhile.

eric, cut them back AFTER they finish their long-attended blooming?what do you use for spray? (i have 5 yr old Neem's but it got wicked thick and i don't know how/if i can thin it.)
thx much,
mindy