One HVAC system, multi-zone with separate thermostats and zone dampers: There is one HVAC system but it is a “multi-zone” system, i.e., different zones are created via electronically-controlled dampers or “doors” installed within the ducts. Separate thermostats turn on the HVAC system. The zone dampers also respond to the thermostats, opening and closing according to which thermostat requests heat or air conditioning.
One-zone system, only one set of ducts and one circulator fan for the entire house, not unusual, may require seasonal balancing: The HVAC system a “one-zone” system, i.e., there is only one set of ducts and one circulator fan for the entire house. This is not unusual and tends to work well in most installations. However seasonal “balancing” is sometimes required to provide even temperatures throughout the house, which can be completed by an HVAC contractor during regular servicing.
Only one air return, one return per floor is recommended, consider hiring HVAC contractor to install one/more additional returns: There is only one air return for the HVAC system. However, one return per floor is recommended. Consider hiring an HVAC contractor to install one or more additional returns, which may improve air distribution through the house.
HVAC return flows through closet, do not restrict air passage with stored items in the closet: The HVAC return flows through the closet. Do not restrict air passage with stored items in the closet.
Not all rooms have dedicated vents, not uncommon when HVAC system added to an older home: Not all of the rooms have dedicated vents. This is not uncommon when an HVAC system is added to an older home.
HVAC system includes electronic air filter(s), regular maintenance required: The HVAC system includes electronic air filter(s). These highly efficient systems remove up to 98% of all particles in the air, including dander and pollen. High voltage wires charge the pollutants, which then attach to an oppositely-charged collector plate. Regular maintenance is needed, and the manufacturer’s guidelines should be followed. Cleaning can usually be done with a hose or in a dishwasher.