The potential for energy savings is vast, but an accurate evaluation is needed to achieve true savings.
Smart HVAC controls are intelligent devices, attached to different HVAC system. These devices give command to the e.g. heat pump for temperature and air flow control. It also defines the temperature to be set according to the weather condition outside the building environment and communicate with the user accordingly the cost effectiveness of the system in terms of energy usage.

When a conventional HVAC controls is equipped with decision making capability, it is termed as a Smart HVAC Controls, i.e Smart HVAC Controls available in the market requires an external agent to integrate in the homes or buildings.

WHAT COULD BE CONTROLLED?
Generally, building automation begins with control of mechanical, electrical, and plumbing (MEP) systems. For instance, the heating, ventilation, and air-conditioning (HVAC) system is almost always controlled, including control of its various pieces of equipment such as:

Chillers
Boilers
Air Handling Units (AHUs)
Fan Coil Units (FCUs)
Heat Pump Units (HPUs)
Variable Air Volume boxes (VAVs)
Features & Benefits:

Web Based: access from iPhone, iPad, or any browser based device.
Energy and Comfort: reduces energy bills and maintains comfort.
Control: any combination of systems including solar, heat pumps, radiant floors, forced air, snow and ice melt, humidity, air quality, HRVs, domestic hot water, etc.
Visualizer: real-time graphical monitoring of all HVAC systems using our icon library. Click on the “More Info” tab above to learn more.
Data mining: charts, graphs, spreadsheets, etc.
Alerts: sent via text messaging and email.
Weather Forecast: interfaces to NOAA using forecasts to alter temperature sensitive operations.
Home Automation Systems: provides interface for single point access by home-owner.
Installation: no proprietary custom programming. Easy to install without complex field wiring by the mechanical contractor.