Personally, I would replace my system with a single stage compressor system. The extra cost for a variable speed system is not worth the initial higher cost (50 to 70 percent more), or the life cycle cost to operate it. It will be more difficult and more expensive to repair, because they are more complex, and there are fewer technicians who can repair them. If only larger companies can repair them, they can charge more because they have less competition. Also, when it comes to resale, I seriously doubt that a buyer will pay more for the house. I certainly would not. But the bottom line is that a variable speed system will not heat or cool your house any better, especially in Florida where most houses are single story, one zone HVAC, and it is consistently very hot every day in the summer. So, most of the time, you want the AC to be running at full speed. My opinion.
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