BN-LINK Smart WiFi Digital Temperature Controller Heating Cooling, Works with Alexa and Google Home. For Reptiles Aquarium Carboy Homebrew Breeding Fermenter Seed Germination °C/°F -40-176°F 15A/1875W
$42.99
Price: $42.99
(as of Oct 31, 2025 09:48:22 UTC – Details)
Product description
Four perfect designs for you 
Heating & Cooling Functions
Dual functions. Capable of controlling a heating and cooling device. Bring you great convenience.
Dual & Clear Screen Display
Convenient to read the current temperature value clearly with the two big and clean screens.
3-Prong Grounded Plug
Durable and heavy duty. Our thermostat controller is durable and long lasting.
Sensor Probe & Suction Cup
Waterproof sensor Probe and thoughtful suction cup setting. Make it easy to use.
1 Incubating
2 Home Brewing
3 Reptile Heating
Technical Specifications
Add to Cart
Add to Cart
Add to Cart
Add to Cart
Customer Reviews
4.1 out of 5 stars 1,001
4.3 out of 5 stars 160
4.1 out of 5 stars 1,001
4.1 out of 5 stars 1,001
Price
$42.99$42.99
$26.99$26.99
$29.99$29.99
$42.99$42.99
Function
Heating & Cooling Controller
Heating & Cooling Controller
Heating & Cooling Controller
Heating & Cooling Controller
Compatible with Alexa
✔
✘
✘
✔
Work with Google Assistant
✔
✘
✘
✔
Controlled by App
✔
✘
✘
✔
Temperature Control Range
-40°F~176°F
-40°F~176°F
-40°F~176°F
-40°F~176°F
Rating
15A/1875W
15A/1875W
15A/1875W
15A/1875W
Indoor/Outdoor Use
Indoor
Indoor
Indoor
Indoor
Specialty
Smart & Wifi
Digital
Digital
Smart & Wifi
【APP Remote Control】The smart WiFi digital temperature controller is compatible with both iOS and Android devices via the free “BN-LINK Smart” app. It only supports 2.4GHz WiFi network, allowing you to control the temperature remotely with ease.
【VOICE CONTROL】 Simply voice command to control the heating and cooling devices with our smart temperature controller via Alexa or Google Home. Enjoy the convenience of voice control and remote operation.
【Versatile Applications】This 2 stage thermostat is perfect for a variety of uses, including seedling germination, rooting, brewing, heating, fermentation, aquariums, and more. Maintain the ideal temperature for different environments effortlessly.
【Dual Functions】Equipped with professional dual digital outlets and three-prong grounded plugs, this thermostat controller can control heating and cooling devices. Bring you great convenience by replacing those controllers that only have a single function.
【Safe & Reliable】 The advanced WiFi thermostat controller comes with overload protection and the sensor probe is waterproof. Rated Voltage is 125VAC 60Hz. 15A/1875W Resistive and general purpose, 1/2 HP, TV-5
Customers say
Customers find the temperature controller effective at maintaining settings and appreciate its high quality construction. The device is easy to set up and use, though some find it complicated to operate. Moreover, the WiFi connectivity receives mixed feedback – while some say it maintains connections well, others report it won’t connect to WiFi at all. Additionally, the functionality, customization options, and instruction quality receive mixed reviews, with some units failing after a few hours of use.
8 reviews for BN-LINK Smart WiFi Digital Temperature Controller Heating Cooling, Works with Alexa and Google Home. For Reptiles Aquarium Carboy Homebrew Breeding Fermenter Seed Germination °C/°F -40-176°F 15A/1875W
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$42.99
Brendan Rood –
Actually just a Solid Choice
I’ve been using this product for a few years now and it is genuinely one of those rare products that is just uncompromisingly good. At the risk of sounding like a review robot, I want to elaborate on my experiences with this device and why it’s been one of the best electronics I’ve bought from Amazon.To clarify, I have only ever used this device for controlling the temperature of my living space, not for any agricultural or misc purposes. Despite this, as someone who is a nut for home automation, this device serves its purpose perfectly.HEATING OUTLET, COOLING OUTLETThe device works by providing electricity to one of its two outlets based on user-defined conditions. These outlets are helpfully labeled “HEATING” and “COOLING”. Having a single device that can control both a heating solution and a cooling solution is SIGNIFICANTLY more intuitive than having two separate systems, one for heating and one for cooling.A WIFI-FREE SOLUTIONMany similar devices are wifi-controlled. That can be a good thing if that product allows for more advanced setups like schedules, but in positions like mine where I live in University Housing (where IoT devices are not allowed to connect to the internet, only complete devices like Computers and Phones can) having an analog system has been ESSENTIAL. Being able to just plug the device in and push a few buttons instead of filing an application with the property holder to add a special exception for the device on the network is much more elegant.PERFECTLY ADEQUATE CONFIGURATION OPTIONSThe device has plenty of variables that can be used to create the exact behavior you want. Some highlights include:SU – “Set Unit” – The ideal temperature you would likeHd – “Heating Differential” – How many degrees colder than the Set Unit the temperature must be before the heat comes on.Cd – “Cooling Differential” – Home many degrees warmer than the Set Unit the temperature must be before the cooling comes on.PT – “Time Differential” – After the system reaches the SU, the system will wait for at least PT number of minutes before allowing any outputs to turn on.By mixing and matching Hd, Cd, and PT it is possible to create very specific behaviors. I will elaborate on this in the next section.GREAT FOR SPREADING OUT CYCLESOne way I use the device is to control my air portable conditioner. By default, my AC will turn on when the temperature drifts by more than ~1*F from the target. This can result in a lot of really short cycles that can be distracting. By configuring my device with a Cd of 3 and a PT of 4, I can make it so that my device runs for longer but less frequently. This is ideal given how jarring the transition in volume between idle and operating modes in portable air conditioners.DURABILITYThe device is extremely durable. My device has seen a fair bit of abuse and functions exactly how it did when I got it. I also appreciate how the cable that connects the device to the outlet is very thick, as this pretty much ensures any devices you plug into the outlets on the device will not be drawing too much power for thin cables to handle. My only consideration is the rather flimsy cable for the temperature probe. As long as you are gentle with it it will be fine but because its connector is a 90* angle it can sometimes be easy to bump it.That’s all I’ve got for now. In a world where products are getting cheaper and flimsier, it’s reassuring to see products that are durable and practical. No gimmicks, no risks, if you want to control a heating and cooling system through an external analog device I really think this is the device for you.
J. Street –
Excellent heat controller!
I find myself pretty surprised by how impressed I am with this little box.I have the basic T9 with no wifi. Setup is super simple, and a device that runs autonomously are superior (IMO) to those which need an internet connection in order to function.Just set this thing and let it handle its business.This thing is very reliable. And tough too.I’m especially enamored with how highly accurate the temperature measurement is on this thing… and if that weren’t enough, its measurement resolution goes down to tenths of a degree (in Fahrenheit, that’s a lot of resolution!)I bought this controller to tame a very sophisticated portable reversible inverter heat pump unit that is a bit too automated for me. (and yes it prefers network connection, unironically) so this was a great override that I used to force it to maintain temperatures outside its internal climate control range.When not using the T9 as a controller, I’ve used it to monitor temps using the probe.I’ve had it in use for 9 months, and currently just switching a fan on with it…and just ordered my second one tonight, to form a logic control circuit for a booster to the heat pump.Hot or cold, if you need a simple reliable solution to control temperatures… this is probably the exact device you’ll need.. Highly recommend!
SevenMichael –
Excellent for controlling temperature – setup not so much
First, the controller does an excellent job of controlling the temperature, and seems to maintain the wifi connection very well. I use it for controlling the heat in my outdoor water treatment shed, so the piping won’t freeze up; I do not use it as an AC controller.The temperature probe seems well made, and is easy to install in the measurement location you need it; plenty of cord length for a small shed. My only issue is the setup. There is no manual for this device; the brief guide that comes with it does not provide nearly enough information, and what it does provide is not adequate. I searched on-line for a manual on the BN-Link web site, but there is none for this model.The hardest part was getting it set up on wifi. There is no WiFi or “connect” button on the device, and no WiFi “reset” or “on/off” button. I’m an engineer, so I’m pretty good with controllers and with software apps. I eventually got it set up and connected to wifi, based on my experience with other apps and controllers. The good news is that once it connected, the BN-Link App works great. You can easily set and control the temperature range from your phone or tablet.Overall, a great device as a controller, it just needs a better user-interface, and a detailed instruction manual for connecting it to WiFi and the BN-Link App. Otherwise, I would have given it a 5-star rating.
Jorge Ocampo –
Fácil de usar, permite encender y apagar aparatos de calefacción, ventiladores, refrigeradores.Ejemplo de uso, hacer operar un refrigerador en un rango de -3C a 3CParametros que se configuran con Set y Up/DownSV o SU -3CCD 6CAl llegar a -3C se apaga, y encenderá 6 grados después a los 3CPara fermentar entre 16C a 21CSV 16CCD 5C
Ernesto e. –
Regular calidad
B.Wilson –
This controller was super easy to setup. And an absolute life saver for my plants, and myself. Canadian winters are cold, so growing indoors can be tricky without the proper temperatures plants cant theive. Well with this BN Link controller its simple plug and play.
Client d’Amazon –
Ãa fonctionne très bien. Très facile à utiliser.
Edwin Nauha –
spent hours trying to get it to work, read the poor instructions and watched some video, still to no avail!!