Underwood's Heating & Air Share: Mechanical/HVACConstruction/Residential & Commercial Underwood's Heating & Air Visit Website 5370 Frontier Dr Sanger, TX 76266 (940) 367-9739 Facebook About Map About We are a local heating and air conditioning company. We service any brand unit and do system replacements. No job is too big or too small. What's Nearby? Distance: 5 10 15 20 25 50 mi.