Along with changing the air filter each month it is also wise to have the unit serviced professionally before the winter and summer seasons. These are when your Hvac companies chapel hill nc will be run the hardest and many problems can occur. By being proactive and having a certified hvac service carrboro specialist come out regularly, you can avoid being stuck without AC during the summer or heat during the winter. These seasonal checkups are more involved and require the expertise of professionals. During these checkups a technician will check the electrical wiring, clean the drains and pipes, check the condenser, heater ignition, check for gas and air leaks, amongst other things.