The average hvac salary at Mcallen Isd was $38,094 , which is 31 percent lower than the average salary for this job in Texas, and 31 percent lower than the national average for this job . Hvac salaries at Mcallen Isd typically range from $35,332 to $40,288 (25th to 75th percentile). The highest reported hvac salary was $48,439. There are 12 employees at Mcallen Isd with the job title hvac.