A timer plus a thermostat doesn’t control a climate. It switches things on and off when a single number crosses a threshold. Fan ON when it’s warm. Fan OFF when it’s not. The room oscillates around the trigger temperature, plants stress through every cycle, and humidity does whatever the weather decides.
A controller adjusts every channel in real time, every second, against a target the plants care about — not a number that’s convenient to measure. Nexus drives fan RPM, exhaust, intake, lights, CO₂ and equipment plugs continuously, against your VPD and DLI targets, with the canopy temperature and barometric pressure folded in. The room doesn’t oscillate. It sits where you set it.
12V DC end-to-end — safe-touch voltage in a humid space, true variable speed control 0–100%, push-pull fan redundancy, no electrician, no PAT testing, no insurance headache. Mains controllers can’t do variable speed without an £80–£120 special fan and extra electronics; we built ours so you don’t need to. Read the engineering rationale →
Hardware-level CO₂ safety. The CO₂ valve runs on its own independent safety circuit — if the main software ever crashes or freezes, that circuit still fires and shuts the gas off. No other consumer controller does this. It is the kind of thing you should not have to ask about, and shouldn’t need, but if you ever do need it — you’ll be glad it’s there.
