Geothermal HVAC actual monthly cost savings
I was poking around and noticed that it seems a number of you out there have gotten geothermal systems installed in the past few years. My wife and I are thinking about it but I've heard enough people claim that the monthly cost savings really isn't there and from all the websites I've scoured all the "monthly cost savings" I've seen are estimates based on best case scenario's and I'd really just appreciate hearing from a few people who have done it. I want to know the good, the bad and the ugly. I live in Montgomery County, Maryland, so if there are any people in my general area or in a similar climate all the better, but any experience would be much appreciated.
Primarily I'm looking for cost spent on heating and cooling before (monthly) and cost spent on heating and cooling after (monthly), ex: december $400 before, $250 after. Also, if you can let me know what you had before it'd be helpful as I have natural gas, which I'm told is already pretty good.
Thanks for the help,