A system comprising: a housing; a security monitoring device having an interactive user display module carried by the housing for user control of a security monitoring system, wherein the security monitoring device is coupled by at least one of a wired or wireless medium to a plurality of condition detectors; and at least one HVAC control module that is displaced from the interactive user display module, wherein the at least one HVAC control module is displayless, connects to heating/cooling/fan equipment with known HVAC-type wiring, communicates with the interactive user display module to transmit first HVAC related information thereto and receive control messages therefrom, and is battery powered with circuitry to recharge the battery, wherein the interactive user display module includes a multi-dimensional display unit for visually presenting both the first HVAC related information from the at least one HVAC control module and security related information pertaining to the security monitoring system, whereby the system is further characterised by wireless communications with the at least one HVAC control module are implemented with a low power mode to periodically wake up the at least one HVAC control module to transmit data and receive the control messages from the interactive user display module, and wherein the at least one HVAC control module is adapted to read ambient temperatures from the heating/cooling/fan equipment over a period of time, calculates an average of the ambient temperatures over the period of time, and transmits the average of the ambient temperatures to the interactive user display module whenever the average of the ambient temperatures changes by a first predetermined amount. a housing; a security monitoring device having an interactive user display module carried by the housing for user control of a security monitoring system, wherein the security monitoring device is coupled by at least one of a wired or wireless medium to a plurality of condition detectors; and at least one HVAC control module that is displaced from the interactive user display module, wherein the at least one HVAC control module is displayless, connects to heating/cooling/fan equipment with known HVAC-type wiring, communicates with the interactive user display module to transmit first HVAC related information thereto and receive control messages therefrom, and is battery powered with circuitry to recharge the battery, wherein the interactive user display module includes a multi-dimensional display unit for visually presenting both the first HVAC related information from the at least one HVAC control module and security related information pertaining to the security monitoring system, whereby the system is further characterised by wireless communications with the at least one HVAC control module are implemented with a low power mode to periodically wake up the at least one HVAC control module to transmit data and receive the control messages from the interactive user display module, and wherein the at least one HVAC control module is adapted to read ambient temperatures from the heating/cooling/fan equipment over a period of time, calculates an average of the ambient temperatures over the period of time, and transmits the average of the ambient temperatures to the interactive user display module whenever the average of the ambient temperatures changes by a first predetermined amount.