A normal HVAC service visit costs between $100 and $150. However, there are a number of factors that influence how much an HVAC service will cost. The entire cost is affected by the kind, size, age and complexity of your system, as well as the time of year. Also, any repairs that are required will have an impact on the total price. You can break the cost up by taking advantage of a maintenance plan with monthly payments and assorted perks, like priority service and discounts on repairs.