As you've seen in some of the other responses, home values can't be determined on a national basis. Cape Coral has experienced a large increase in prices over the past year, are seem to be continuing in that direction. SW Cape Coral is a very desirable neighborhood, so is good for you too.
Any good LOCAL real estate agent would be happy to give you a comparative market analysis of the value of your home and what it could sell for. We would base that on the neighborhood, comparable homes sold, as well as any additional features or upgrades your home has. Zillow and other sites like that don't take all that into consideration. And of course they don't know Cape Coral! Cape Coral has has over a 28% increase in single family home prices in the past year. That far outpaces ANY other area in the country.
I hope this help, and if you would like any more information, please feel free to call me. I currently have several listings in the SW Cape, so am very familiar with the area.
Miloff Aubuchon Realty Group