If you had a new HVAC installed it will likely run with no problems for quite some time. Still, problems will crop up over time and generally at the worst possible times. One way you can help prevent this is to get your HVAC system maintained at least twice per year, which is generally the beginning of spring and the beginning of fall. Below is information about two things the contractor may start with.
Inspect Exterior Unit
The exterior unit looks like a large metal box that has a vent on the side of it. The unit is generally placed on a slab of concrete. This is important as the unit should never be directly on the ground. The contractor that installed your unit likely made sure of this. If it's not on concrete, then you could use boards or another way to lift the unit up.
Don't leave debris around the unit and do not let grass grow tall around it. Grass and debris will block the vent. You do not want this to happen as it will cause less air to get into your home. This is especially true during the fall months and if you have a lot of trees around your property.
If you have a lot of problems with debris building up around the unit, you can put a fence around it to prevent this. You do have to ensure the fence is easy to open so a contractor can easily get to the unit. Leaves can still fall from trees and get inside, so put some kind of wire over the unit, such as chicken wire, that can be easy to remove.
The ductwork is an important part of your HVAC unit. It supplies all the rooms inside your home with heated or cooled air. If the ductwork is damaged in any way, this will prevent all the air from getting through the vents. This will cause your home to not be as cool or warm.
Ductwork is generally made of aluminum or steel. Both these materials are light, which makes it easier for the contractor to install. In most cases, the ductwork will be installed in the crawlspace of your home. The main problem with ductwork is the seams coming apart. This will start out very small and get larger over time. If this happens, the contractor can replace the ductwork for you.
Besides these two things, the HVAC installation contractor will maintain other parts of the system. For example, they will open the HVAC unit and inspect the parts inside. They will check the thermostat inside your home to make sure it is working properly.