The average hvac salary at Katy Isd was $47,139 , which is 15 percent lower than the average salary for this job in Texas, and 15 percent lower than the national average for this job . Hvac salaries at Katy Isd typically range from $43,405 to $52,460 (25th to 75th percentile). The highest reported hvac salary was $75,500. There are 28 employees at Katy Isd with the job title hvac.