A crucial factor to remember is that some service providers charge a flat rate and others charge an hourly rate for service calls. If this is the case, the manufacturer may require maintenance by a technician who is explicitly certified for the brand and often the manufacturer will pay part or all of the maintenance costs. This person would probably call a HVAC service company to come and diagnose the problem with the air conditioning system. In most cases, the HVAC company would charge for the initial service call to go out and diagnose the problem.
Fixing the problem could be more expensive than a standard HVAC service call, depending on the diagnosis. And as I said before, weekend services tend to be a little more expensive than regular services on weekdays. You can also hire other professional HVAC service experts for annual maintenance of your air conditioning system. A service call is simply a service provided when a homeowner or business owner has a problem or malfunction that needs to be examined or diagnosed.
If the HVAC system is still under warranty, the manufacturer can pay most or all of the annual service charge. After that, instead of including a service call on the bill for each trip, some service companies will simply charge for labor and parts (on the bill). Most air conditioning companies offer annual maintenance services to buyers by paying extra money for the service. Consider installing a new HVAC system if your units are more than 10 years old and the HVAC repair bill would be more than 30% of the cost of a new air conditioner and oven combination.
Even if your HVAC unit is working properly, it's good to have it serviced once a year to help minimize problems in the future. An additional benefit of having annual service is the visual inspection performed by an HVAC technician, who will detect potential problems before they become costly problems. It's important to understand that a well-maintained HVAC system will require less maintenance and will last longer than a neglected one.