A zoned HVAC system allows you to set different temperatures for different parts of your home. There are definitely some amazing advantages to an HVAC zoning system, not the least of which is a lower utility bill. A standard HVAC system controls the temperature of an entire house, which is fine if you have a small house on a single level. Even then, if your thermostat is located in a relatively large living room, you may find that a small bedroom with a closed door becomes uncomfortably hot (or cold in the case of air conditioning). That is because the thermostat responds to the temperature in the larger room, which means the smaller room may stay hotter or colder than the living room. The only way to remedy this situation is to close the register in the smaller room so heated (or cooled) air stops circulating. However, this is only a partial remedy because if conditioned air is not circulating in the room, the temperature may get uncomfortable over time.