The cost of HVAC maintenance depends on a number of factors, including the type of system you have, the size of your home or business, and the frequency of maintenance. For a typical residential HVAC system, expect to pay between $100 and $200 for a basic maintenance visit. This will cover things like changing the air filter and cleaning the coils. More comprehensive maintenance packages can cost between $250 and $500. Look at this site for more about HVAC contractors.

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For commercial HVAC systems, the cost will be higher, since these systems are usually much larger and require more frequent maintenance. Expect to pay between $500 and $1000 for a commercial HVAC maintenance visit. 

Industrial HVAC systems are the most expensive to maintain, since they are often very large and complex. A typical industrial HVAC maintenance visit can cost between $1000 and $5000. 

If you live in an area with extreme weather conditions, then you may need to service your system more often to ensure that it is running properly. Additionally, if you use your system frequently, then you may need to service it more often to prevent wear and tear.

Most HVAC companies offer discounts for customers who sign up for regular maintenance plans. These plans typically include two or more visits per year, and can save you 10-20% off the cost of each visit.