Talk about speedy service -- I called these guys about 1.5 hours ago and the technician showed up within 30 minutes! The tech was very friendly and explained what he was going to do. Sure enough, I needed some freon to help my very old (20 yr old) unit blow some cooler air. He said there's probably a leak, but told me that he doesn't think it's a very big one since he couldn't identify it. I asked for a quote to replace the unit and now will start saving and thinking about it!