Even being in Florida we don’t like the heat cost. Florida designs with cooling from ceiling, cold air falls, doesn’t work with heat from same ducts. So we use a few ‘hvac controlled’ space heaters that will heat from the floor for the few weeks a year we need it. hvac controls prevent cool and heat from every both running at the same time.
When using space heaters run your ceiling fans in reverse bring the hot air down to your living area.