The answer to 'how much does maintenance cost' is that the cost of HVAC maintenance can vary widely depending on several factors. As a general range, routine maintenance for a typical residential HVAC system can cost between $75 to $300 per visit, with most homeowners paying around $150 per service call.
The exact cost will depend on the size and complexity of your system, the type of maintenance required, your location, and the service provider you choose. Regular tune-ups and preventative maintenance are important to keep your HVAC system running efficiently and extend its lifespan, so it's worth budgeting for these services annually.