The median home price in Texas is $301,806. At 80% LTV, the typical loan is $241,445 at the current 6.76% average rate, producing a monthly P+I payment of $1,568. Total interest over 30 years at this rate: $322,896.
Property taxes in Texas average 1.4% of assessed value, or $4,225 per year on the median home. This adds $352/month to your all-in housing cost. When evaluating a refinance, factor in property tax and insurance for a complete picture.
Texas 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.