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I think the heat will be your MAIN concern. Chickens handle the cold much easier. All you really want to do for cold is protect them from blowing wind, rain, sleet and snow by having a roof and a wall or two that faces the direction the main winds come from. We get a lot colder than you do, and I would never think about actually heating the coop. We have turkey barns around here that are nearly open all year long- just a roof- even in snow! They have drop down tarps when it gets really bad. I can't imagine Florida needing anything like that. I think like everyone else said, that a 3 sided coop is really all you're going to need. Your worry should be about having enough ventilation and shade and keeping them cool. If you don't have a shady spot, grow some vines that will cover up the area quickly to protect them from the heat. That is what I'm going to do- we're in the plains and we've been having 110 + degree heat this summer- totally brutal, no rain. Going to plant a lot of vines around the run and coop.