Heat transfer system and environmental control system with heat transfer system

An arrangement of multiple environmental control systems for a multi-unit structure comprising:

• a) a system monitor in communication with each of the multiple environmental control systems;
• b) a first environmental control system installed in a first unit of the multi-unit structure, the first environmental control system comprising:
• i) a first control unit coupled to the system monitor through a first firewall that prevents unauthorized devices from accessing the first control unit;
• and
• ii) at least one first heating, ventilation, and air conditioning (HVAC) system device coupled to the first control unit through the first firewall,
• wherein one or more first local user devices that are located inside the first unit are coupled to the first control unit through a first local communication interface;
• and
• c) a second environmental control system installed in a second unit of the multi-unit structure, the second environmental control system comprising:
• i) a second control unit coupled to the system monitor through a second firewall that prevents unauthorized devices from accessing the second control unit;
• and
• ii) at least one second HVAC system device coupled to the second control unit through the second firewall,
• wherein one or more second local user devices that are located inside the second unit are coupled to the second control unit through a second local communication interface.

An arrangement of multiple environmental control systems for a multi-unit structure comprising:

• a) a system monitor in communication with each of the multiple environmental control systems;
• b) a firewall;
• c) a first environmental control system installed in a first unit of the multi-unit structure, the first environmental control system comprising:
• i) a first control unit coupled to the system monitor through the firewall that prevents unauthorized devices from accessing the first control unit;
• and
• ii) at least one first heating, ventilation, and air conditioning (HVAC) system device coupled to the first control unit through the firewall,
• wherein a first local user device that is located inside the first unit is coupled to the first control unit through a first local communication interface, and
• wherein a first external user device that is located outside the first unit communicates with the first control unit through the firewall;
• and,
• d) a second environmental control system installed in a second unit of the multi-unit structure, the second environmental control system comprising:
• i) a second control unit coupled to the system monitor through the firewall that prevents unauthorized devices from accessing the second control unit;
• and
• ii) at least one second HVAC system device coupled to the second control unit through the firewall,
• wherein a second local user device that is located inside the second unit is coupled to the second control unit through a second local communication interface, and
• wherein a second external user device that is located outside the second unit communicates with the second first control unit through the firewall.