A HVAC system to work properly throughout the year it is necessary to schedule for a preventive maintenance. The HVAC Company to whom you have assigned the maintenance task will ensure that your filters are replaced regularly, they will also clean the coils, and check the ducts and the insulation to ensure whether everything is intact and working properly. Out of their experience and technical knowledge they will be easily able to detect any problems and fix them. If such care is provided to your heating and cooling system then it will never breakdown while the unit is functioning. Since HVAC units are sophisticated it is important that you get the maintenance and repair work done only by professionals. If the unit breaks down in the middle of winter or summer then its repair may take time because it will be a busy time. The break down will put you in a situation where you will have to bear the too hot or too cold climate.
Even if the charges for professional service may sound to be high you need to choose only them. Do not entrust the task to those who are not professional and lack experience as it will damage your unit and will eventually lead to costly repair works. Boilers are in fact dangerous when handled by inexperienced people. The refrigerant if not handled properly will be hazardous so even if you have to pay a little extra it is better to call for professional help in case of repair or maintenance.