A technical adapter system operates to wirelessly, remotely control a conventional thermostat and/or components of an HVAC system, HVAC/R system or both, to which the conventional thermostat is connected, and optimizing energy efficiency of the HVAC system components. This effectively heats and/or cools a space or volume that the HVAC and/or HVAC/R system is configured to heat and/or cool. An adapter device includes a processor, a memory and an adapter application program component, the adapter device configured to connect to the conventional thermostat, the HVAC system or both. A hand-held electronic device including a smart device application program component that operates to enable a hand-held electronic device user to wirelessly connect to the adapter device, and remotely control and command the adapter device.