We live in an Irving and our room is always 8-10 degrees below thermostat. Our daughters room - by the other bathroom, was 65 when therm was at 73! Big difference. We aren't shutting doors so I am not sure what more we can do. There is also major cold air coming up from our basement (unfinished) door into the house at the top of the stairs. Has anyone added insulation above the garage, or additional into the walls?