Methods, mediums, systems, and devices for redundant monitoring are disclosed. One method of providing redundancy in an environmental monitoring device includes combining a first sensor, one or more redundant sensors, and a plurality of control logic components; monitoring a selected environmental condition using the plurality of sensors; measuring the selected environmental condition using the plurality of sensors each reporting to a particular control logic component among the plurality of control logic components, each of the plurality of control logic components monitoring a sequence of such measurements; and correlating corresponding monitored measurements from the sequence of measurements of each of the plurality of control logic components and determining whether a difference exists between the corresponding monitored measurements of each of the plurality of control logic components.