Average Hourly Cost: The average hourly cost for HVAC system design from a HVAC contractor in 2023 is around $75 - $150 per hour.

Cost Breakdown: The cost of HVAC system design from a HVAC contractor typically includes labor costs, materials, and service fees. Labor costs include the cost of the contractor's time for designing the system, installation, and any necessary repairs. Materials costs include any necessary components and equipment needed to complete the job. Service fees may include permits, inspections, and other related costs.

Factors Affecting Cost: There are several factors that can affect the cost of HVAC system design, such as the type and quality of the accessories, the complexity of the job, and the location and service provider. The type and quality of the accessories used in the system will affect the cost, as higher quality materials are typically more expensive. The complexity of the job will also affect the cost, as more complex systems require more time and effort to design and install. Finally, the location and service provider will affect the cost, as different contractors may charge different rates for their services.