If you have had your HVAC system for more than ten years, you need to start planning for a new heating and cooling unit. The average life expectancy of an HVAC system is 15 years. The longer you continue using it, the less efficient it becomes. Without regular and proper maintenance, the unit will break down before the 15 years are over. According to some air conditioning contractors, regular maintenance of your HVAC unit prolongs its lifespan and boosts its efficiency. Worth mentioning is that different types of central heat and air units come with a higher efficiency rating. As…