The median home price in Florida is $378,167. At 80% LTV, the typical loan is $302,534 at the current 6.76% average rate, producing a monthly P+I payment of $1,964. Total interest over 30 years at this rate: $404,593.
Property taxes in Florida average 0.78% of assessed value, or $2,950 per year on the median home. This adds $246/month to your all-in housing cost. When evaluating a refinance, factor in property tax and insurance for a complete picture.
Florida has no state income tax, so there is no state-level mortgage interest deduction. The federal deduction still applies on loans up to $750,000 for itemizers.