We recently added a mini split system to air condition our house and it's performing very well. Watch the video and learn what these systems are and why it might be the right solution for your home. One thing I forgot to mention in the video is that the control has a "DRY" setting where it will just act like a dehumidifier for the house and not run the full cooling mode.

http://www.fujitsugeneral.com/wallmou...

You can actually buy one on Amazon! It's pretty easy to install, but you'll need an HVAC Contractor to charge the system with refrigerant.
http://www.amazon.com/dp/product/B00E...