Advice on floor vents or ceilng vents?

I am house hunting and have found a home I really like the heating and cooling vents are in the ceiling. I have read good and bad about this I realize heat rises but if i use ceiling fans to circulate the hot or cold air coming out will that circulate enough to keep the house warm without making the electric bill sky high. The home has wood and carpet if that matters. Is on block foundation no fireplace.Any advice would be very helpful thanks.