What this compares
Total 5-year cost of buying (PITI + maintenance + opportunity cost of down payment, less appreciation and equity build) vs. total 5-year cost of renting (rent payments rising with inflation, less the return on the down payment kept invested).
Florida-specific assumptions: 1.0% property tax, 0.65% insurance (low for coastal - adjust if relevant), 1% annual maintenance reserve. The comparison is conservative - buying becomes more advantageous over longer hold periods because closing costs amortize.