The median home price in Texas is $340,000. At 80% LTV, the typical loan is $272,000 at the current 6.90% average rate, producing a monthly P+I payment of $1,791. Total interest over 30 years at this rate: $372,901.
Property taxes in Texas average 1.8% of assessed value, or $6,120 per year on the median home. This adds $510/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.