Which manufacturer/model sensors are you using? I have made some environmental monitoring with very cheap sensors for some hobby projects, but have very bad experience on repeatability of the sensor reading, or for CO2 sensors even noise tolerance (was also dicussed on HN, that discussion made me realize that noise is the cause of the problems, and have managed to verify that).
I have some project ideas beyond my at-home breadboard prototyping but to go beyond I'd rather build on reliable components as the software/infra side is maturing now.