The average hvac salary at Houston Isd was $52,541 , which is 5 percent lower than the average salary for this job in Texas, and 5 percent lower than the national average for this job . Hvac salaries at Houston Isd typically range from $50,425 to $55,504 (25th to 75th percentile). The highest reported hvac salary was $58,656. There are 79 employees at Houston Isd with the job title hvac.