Best Smart Greenhouse Climate Controllers 2026

The AC Infinity Controller 69 PRO earns the top composite of 9.9 on the SHE Greenhouse Climate Automation Score. It is the only controller whose climate-channels factor maxes out completely. What that weighted number means for your greenhouse is concrete. Four UIS ports each run an independent program, so the exhaust fan ramps on VPD while the heater holds a floor and the humidifier targets a band — 4x the single channel a dual-stage box automates. Bob Vila notes the variable PWM speed spans 10 discrete levels, delivering smooth ramping rather than the abrupt switching that stresses a relay.

The 12 ft thermal-alloy probe senses temperature and humidity and computes VPD continuously. That enables the dynamic triggers growers use to match humidity to transpiration. Popular Mechanics highlights the BT plus WiFi alarms, which push a frost or heat alert to your phone whenever a reading crosses the floor you set. Across a 5-yr ownership window the four-channel automation justifies the $89.99 outlay against single-purpose boxes.

Compared to the VIVOSUN GrowHub Controller E42A+, the 69 PRO adds variable PWM hardware the GrowHub's on/off channels lack, which is why it yields the higher composite.

The VIVOSUN GrowHub Controller E42A+ earns a composite of 8.8 on the SHE Greenhouse Climate Automation Score, the second-highest mark here. For your greenhouse that means four automated channels at the value tier. It drives up to four duct fans plus lights with timer, cycle, schedule, and VPD triggers from one box. Family Handyman notes the dual inside and outside sensors track the temperature and humidity gradient that a single-probe box cannot see across the two zones.

Its custom grow recipes preset an entire climate program, so a propagation phase and a fruiting phase each load in one tap. CNET frames the WiFi app as the same remote-monitoring and alert tier serious growers expect, driving up to 4 duct fans plus lights on timer, cycle, schedule, and VPD triggers. Native sensing covers temperature and humidity, and CO2 or light requires the optional 4-in-1 add-on sensor.

Compared to the AC Infinity Controller 79 PRO, the GrowHub automates four channels rather than two — 2x the breadth at the same value tier — which is why it yields a markedly higher composite.

The AC Infinity Controller 79 PRO earns a composite of 7.15 on the SHE Greenhouse Climate Automation Score. For your greenhouse that delivers app and VPD control of gear you already own. Two standard AC outlets run up to 1100W combined, each on an independent program, so a heater and an exhaust fan follow separate logic. Bob Vila notes the standard outlets mean no proprietary device line, unlike the UIS 69 PRO. Because the controller distributes its $79.99 across only two automated channels, the resulting $40 per channel runs nearly 2x the 69 PRO's $22.50, where the flagship amortizes a comparable investment across four functions. Over a 5-year ownership window, that per-channel differential is the genuine consequence of the two-channel limitation.

Its temperature and humidity probe computes VPD, and the BT plus WiFi app pushes the same climate alerts as the flagship. Popular Mechanics positions the 79 PRO as the outlet-based path to VPD automation for plug-in equipment. The trade is breadth, since two outlets switch on and off rather than ramping at variable speed.

Compared to the Inkbird ITC-608T Temperature and Humidity Controller, the 79 PRO adds VPD compute and remote alerts the local-display Inkbird cannot provide, which produces a higher composite despite the same channel count.

The Inkbird ITC-608T Temperature and Humidity Controller earns a composite of 5.3 on the SHE Greenhouse Climate Automation Score. For your greenhouse that delivers two-dimension control on a budget. Its dual inputs drive four relay actions, heat and cool plus humidify and dehumidify, through a pre-wired 120VAC 15A 1800W ETL box. The 15A rating leaves headroom for a real greenhouse heater on the heat socket. Good Housekeeping notes the 12 time-period temperature settings stage separate day and night targets across a 24 hour cycle.

Two probes read temperature and humidity, and the box switches each dimension on and off against your setpoints over that same 24 hour cycle. Consumer Reports flags the limitation plainly: this is a local-display unit with no WiFi. There is no VPD compute and no remote alerting, so an overnight frost goes un-noticed until morning.

Compared to the Inkbird WiFi ITC-308 Digital Temperature Controller, the 608T adds a humidity dimension but gives up the WiFi frost alert that earns the 308 its alerting credit.

The Inkbird WiFi ITC-308 Digital Temperature Controller earns a composite of 4.7 on the SHE Greenhouse Climate Automation Score. For your greenhouse that delivers connected frost protection at the lowest price here. Its dual-stage relay runs heat and cool across a -58 to 210F range at plus-or-minus 1F, with compressor delay protection that guards a cooler. Consumer Reports notes the WiFi app pushes a frost alert to your phone, which the local-display Inkbird boxes cannot.

That remote alerting is precisely why it outranks the considerably pricier ITC-608T despite regulating only a single climate dimension. On the value factor the controller lands at $49.99 for that one channel, producing $50 per channel — more than 2x the 69 PRO's $22.50 — although that apparent premium ultimately purchases the only genuine WiFi frost alert available anywhere near this price point. The formula deliberately rewards the WiFi notification that intercepts an overnight freeze before the damage accumulates. Good Housekeeping frames it as the reliable single-channel recommendation: temperature only, without humidity regulation, and without any VPD computation.

Compared to the Inkbird IHC-200 Humidity Controller, the 308 WiFi adds remote alerting the humidity-only IHC-200 lacks, which lifts its composite above the bottom of this guide.

The Inkbird IHC-200 Humidity Controller earns a composite of 3.7 on the SHE Greenhouse Climate Automation Score, the entry point in this guide. For your greenhouse that represents focused, single-job value. Its dual relay runs a humidifier and dehumidifier across a control range topping out at 99% RH, holding plus-or-minus 3% RH accuracy. Consumer Reports positions it as the specialist for mushroom houses and propagation rather than a connected controller.

The ceiling is breadth, and the formula scores it honestly. At $41.99 for its single humidity channel it works out to roughly $42 per channel, nearly 2x the 69 PRO's $22.50, because one dimension cannot spread the cost. There is no temperature channel, no VPD compute, and the local display means no remote alerting. Good Housekeeping frames it as the cheapest pre-wired humidistat, holding humidity to plus-or-minus 3% RH across a 5-to-99% RH control range, which is precisely its appeal for one focused job.

Compared to the AC Infinity Controller 69 PRO, the IHC-200 automates a single humidity dimension where the flagship orchestrates four, which is why it anchors the bottom of the ranking.