The present disclosure is directed to systems and methods for providing wireless connectivity to a system, e.g., an HVAC system, having at least one non-communicating unit, e.g., an outdoor unit such as an HVAC unit and/or an indoor unit such as an air handler or a furnace. The system may include a wireless connectivity device that may be mechanically and operatively coupled to or otherwise integrated with the non-communicating unit, to thereby provide communication capabilities to the non-communicating unit. Accordingly, via the wireless connectivity device, the non-communicating unit may communicate information with additional components of the system including, e.g., a communicating unit, a thermostat, and/or cloud storage for providing access to third parties.