Average Hourly Cost: The average hourly cost for HVAC system testing by a HVAC contractor is typically between $75 and $125 per hour.

Cost Breakdown: The cost of HVAC system testing will depend on the type of accessory needed, the complexity of the job, and the location and service provider. This cost breakdown will include labor and materials, such as the cost of the parts and the cost of the technician's time.

Factors Affecting Cost: The type and quality of the accessory needed for HVAC system testing can significantly affect the overall cost. The complexity of the job, such as the size of the system and the number of components to be tested, can also affect the cost. The location and service provider can also have an impact on the cost.