Efficient distribution of heating, ventilation, and air conditioning functionality

1. A system for replicating settings in a heating, ventilation, and air-conditioning (HVAC) network, comprising:

a first control unit comprising a first internal clock operable to maintain an internal time for the first control unit, the first control unit communicatively coupled to a first plurality of HVAC units and a first interactive display;

a second control unit comprising a second internal clock operable to maintain an internal time for the second control unit, the second control unit communicatively coupled to a second plurality of HVAC units and a second interactive display; and

a communications network, wherein the first control unit detects the second control unit over the communications network and the first control unit and the second control unit synchronize the first internal clock and the second internal clock to have the same internal time; and

the first control unit is further operable to:

receive a first settings update from the second control unit;

determine drat the first settings update is associated with a changed universal setting comprising a first setting time, wherein the changed universal setting comprises at least one of a language preference, a temperature unit preference, a password for the communications network, an address of the first and second control units, or a dealer of the first plurality of HVAC units and second plurality of HVAC units;

compare the first setting time of the changed universal setting to a stored setting time of an existing universal setting, wherein the stored setting time reflects the time when existing universal setting was changed and the first setting time reflects the time when the changed universal setting was changed;

determine that the first setting time is more recent in time than the stored setting time;

update the existing universal setting with the changed universal setting; and

implement the changed universal setting in at least one of the first plurality of HVAC units and the first interactive display.

2. The system of claim 1 , wherein the first control unit is operable to:

receive a second settings update from the first interactive display;

determine that the second settings update is a universal settings update; and

transmit the second settings update to the second control unit over the communications network.

3. The system of claim 2 , wherein the first control unit is operable to:

receive a third settings update from the first interactive display;

determine that the third settings update is a local settings update;

store the third settings update in a settings database; and

determine that the third settings update does not get transmitted to the second control unit because it is a local settings update.

4. The system of claim 1 , wherein the first control unit is operable to:

receive a fourth settings update from the second control unit;

determine that the fourth settings update is associated with a changed universal setting comprising a third setting time;

compare the third setting time of the changed universal setting to a stored setting time of an existing universal setting;

determine that the third setting time is older than the stored setting time; and

maintain the existing universal setting.

5. The system of claim 4 , wherein the first control unit is further operable to transmit the existing universal setting to the second control unit.

6. The system of claim 1 , wherein the communications network is a Wi-Fi network.

7. The system of claim 1 , wherein the communications network is an HVAC control network in which the first and second control units use a Wi-Fi direct protocol to facilitate communications.

8. The system of claim 1 , wherein the communications network comprises a wireless access point connected to the Internet; and

the first control unit is further operable to connect to a control server over the Internet using the wireless access point, receive a fifth settings update from the control server, determine that the fifth settings update is a universal settings update, and transmit the fifth settings update to the second control unit over the communications network.

9. The system of claim 1 , wherein the universal setting is a schedule for an operation of the first and second control units.