The average hvac salary at Keller Isd was $48,902 , which is 12 percent lower than the average salary for this job in Texas, and 12 percent lower than the national average for this job . Hvac salaries at Keller Isd typically range from $40,061 to $57,786 (25th to 75th percentile). The highest reported hvac salary was $59,634. There are 11 employees at Keller Isd with the job title hvac.