I have actually looked into this, even before the panels went on. The sticker price was around 30 grand before tax incentives. A bit pricier than I was looking for, but will reopen that route before we make a decision. We are adding a wood burning insert for this winter to see how much we can knock off the oil usage. Our a/c unit is 14 years old and ready to be replaced, the oil burner is the same age, but has a good 5 years left, but the tank/flue liner needs replaced sooner rather than later, so that may be the push to remove the system all together. Odds are this winter ends up being warmer than normal, little snow and I will have no clue how well the wood insert could do....
How is your solar search going?