An HVAC sensor assembly for sensor deployment within an HVAC air passage defined by passage walls is provided. In some instances, the HVAC sensor assembly includes a base mountable to a passage wall of an HVAC air passage, and a support member attached to and extending out from the base and configured to project into the HVAC air passage. The HVAC sensor assembly may include one or more HVAC sensors secured to the support member such that the one or more HVAC sensors are positionable and then maintainable at a field configurable distance from the base.