I did the same this past thing, the best part about it is the reduction in cost for heating from 300+/mo to ~25/mo, The downside is that it was terribly expensive to install, it ran me 40k to install the new heat pump and air handler.
That's why I stuck with a gas furnace and traditional AC when I was looking a few years ago. My heating and cooling costs are only about $800-1000 a year. Spending an extra $8-10k up front in hopes of reducing that figure simply doesn't pencil out. Maybe by the time I'm in the market for a new system it will.
