Buy Now, Pay Later
As low as
$21.67
/ mo
Learn more
- – 6-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Free shipping on this product
30-day returns
Learn more
30-day refund / replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Tuesday, Sep 15
Features
- Full Remote Control Via Smartphone AppTweak your heating and cooling settings remotely from your phone. Prewarm or cool your house on your commute home, modify schedules and monitor device status away from home. Never step into an uncomfortably hot or cold living space again with Siterwell wifi thermostats for home.
- Ultra-Wide 95% HVAC System CompatibilityOur smart wifi thermostats Fully compatible with most standard 24VAC residential HVAC equipment,Supports singlestage and multistage heating & cooling systems, compatible with gasfueled, oilfired and electric heat sources, as well as auxiliaryheat and emergencyheat modes.
- Sensitive HD TouchScreenBoasting an awardwinning 3.5inch fullcolor responsive touch screen with clear readout and modern homefriendly appearance. You can quickly check realtime temperature, humidity and working mode.No stiff physical buttons, come with Siterwell Smart HVAC Thermostat every family member can set comfortable indoor temperature effortlessly.
- DIY InstallationThe smart home thermostat Designed with clearly labeled color-coded terminals for fast, error-free DIY installation. NOTE: Please confirm your heating system equips a Cwire for steady power supply before installation. Seamlessly works with Alexa, Google Assistant for full voice hands-free control, bringing effortless smart home convenience to your daily life.
- High Quality The household thermostats is ULcertified for NorthAmerican homeuse safety. PINcode lock prevents accidental setting changes. Premium build quality comes backed by a 3yearlong warranty for reliable longtime operation
Description
SITERWELL is the only company in Asia with a laboratory capable of UL fire testing for both American and EU fire testing for European requirements. We spent 15 million US dollars to clone the United States UL laboratory, which perfectly covers the latest European, Australian, Canadian and American standards.
Brand: SITERWELL
Model Name: GS366A-MWAC
Controller Type: Touch
Special Feature: Clock Display, Date Display, Portable, Programmable
Color: Black
Controller Type: Touch
Additional Features: Clock Display, Date Display, Portable, Programmable
Temperature Control Type: Programmable
Connectivity Technology: Wi-Fi
Display Type: touch screen
Screen Size: 3.5 inches
Control Method: App, Touch, Voice
Connectivity Protocol: Wi-Fi
Mounting Type: Wall Mount
Color: Black
Product Style: Contemporary
Brand Name: SITERWELL
Model Name: GS366A-MWAC
Model Number: GS366A-MWAC
Manufacturer: SITERWELL ELECTRONICS CO.,LIMITED
Number of Items: 1
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Sep 15
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
This modern programmable wall controller brings effortless temperature management and a clean, high-tech look to any home living space. The crisp digital touchscreen display is bright, clear, and easy to read from across the room, providing immediate visibility of current temperatures, humidity levels, and active heating or cooling cycles at a quick glance. Tapping through system settings, fan modes, and custom weekly schedules feels smooth and intuitive right on the unit itself without having to decipher confusing menu icons. Connecting to home wireless networks and linking with voice assistants adds fantastic everyday convenience, letting you adjust room temperatures effortlessly with simple voice commands or through the companion smartphone app while away from home. Setting custom schedules helps optimize home comfort around your daily routine while keeping energy use efficient throughout changing seasons. The wall plate mounts cleanly and sits flush against drywall, delivering a sleek, modern upgrade that makes managing indoor climate simple, smart, and dependable.
...
show more
Reviewed in the United States on August 27, 2026 by wandrvibes
I recently upgraded to the SITERWELL Smart Thermostat and I'm very impressed with the value. The touch screen is responsive and easy to navigate, and the app integration works flawlessly with both Alexa and Google Assistant. Being able to adjust the temperature with my voice or from my phone while away from home is a game changer. Installation was straightforward, but a crucial note: **you do need a C-wire**. If your old thermostat didn't have one, you might need to run a new wire or buy a separate C-wire adapter, which wasn't immediately obvious to me at first. Once connected, the WiFi setup was quick, and the scheduling features are intuitive. The touch screen looks modern on the wall and the build quality feels solid. For the price, this is an excellent upgrade for any smart home setup.
...
show more
Reviewed in the United States on August 27, 2026 by I_Spock
I grabbed this SITERWELL Smart Thermostat to integrate with my existing smart home. The housing of this thermostat feels rather rigid and durable. The installation was quick and simple using the included instructions and by following the wire labels on existing non-smart thermostat as a reference guide. This thermostat has a clean, modern appearance that blends nicely with the wall and isn't an eyesore. Once installed, connecting it to my home's 2.4 GHz Wi-Fi was quick and problem-free. Since connecting this device, I haven't experienced any lag, weak signal or dropouts. I was able to pair this device with Alexa without any issues or errors. The programmable settings are especially useful because I can set different temperatures for different times of the day and avoid wasting energy when nobody is home. I also like the ability to control the thermostat from my phone or Alexa without having to get up and adjust it manually. The display is bright, clear, and easy to read from multiple angles and distances. Temperature changes are responsive and almost instant. Overall, this thermostat provides excellent convenience, useful smart features, and is responsive to inputs at a reasonable price.
...
show more
Reviewed in the United States on August 19, 2026 by Amazon Customer
I installed this SITERWELL smart thermostat to replace an older thermostat, and it has been a great upgrade. The touchscreen is responsive and easy to navigate, and the setup was straightforward as long as you have the required C-wire available. The WiFi connectivity is one of my favorite features. Being able to check and adjust the temperature from the app is really convenient, especially when I'm away from home. The programmable scheduling also makes it easy to have the HVAC run according to our normal routine instead of manually changing the temperature throughout the day. The Alexa and Google Assistant compatibility is another nice bonus. Voice control works well for making quick temperature adjustments without having to walk over to the thermostat. The thermostat has a clean, modern appearance and looks much better on the wall than the older unit I replaced. Overall, it's been reliable, easy to use, and gives me the smart-home features I wanted without being overly complicated. Definitely a worthwhile upgrade for a compatible HVAC system.
...
show more
Reviewed in the United States on August 16, 2026 by tyler
SITERWELL Smart Thermostat Programmable Home WiFi Thermostat I got this to replace our older thermostat and so far I'm really happy with the upgrade. Installation wasn't bad, and getting it connected to WiFi was easier than I expected. I really like being able to adjust the temperature from my phone instead of getting up every time, especially at night. The display is clear and simple to use, and the thermostat feels well made. I haven't had it long enough to judge long-term durability, but everything has been working like it should. For the features you get, I think it's a good value and a nice upgrade from a basic thermostat.
...
show more
Reviewed in the United States on August 21, 2026 by Staci F.
I’ve been using this smart thermostat long enough to appreciate how much engineering care went into it, and it genuinely feels like a modern control hub rather than a simple temperature dial. Functionality is excellent; the touch screen responds instantly, the interface is clean, and the scheduling features behave exactly as they should without any odd delays or misreads. Usefulness shows up every day, especially when I’m away from home and can adjust the temperature from my phone so the condo feels just right when I walk in. My British retriever has taken a liking to it too, mostly because he enjoys lounging in whatever perfectly tuned climate I set for him. Accuracy has been spot‑on, with readings matching my external sensors and the HVAC responding precisely to each adjustment. Considering the build quality, the remote‑control convenience, and the overall reliability, the value for the money is genuinely impressive.
...
show more
Reviewed in the United States on August 19, 2026 by Raif
I really like this thermostat and it was simple to setup. After installing and first powering up, the device tries to automatically detect which wires are connected and it did a great job there. I have a simple heat/cool system but this thermostat looks like it also works with 2-stage heat pumps. Next was setting up an account, which was pretty standard. Information went to my junk mail by default so watch for that. The app store on Google show only 500+ downloads so take that into consideration. You can link to Amazon or Google Home Assistant or use the app. The device and setup is similar to other name brand thermostats. We already have Siterwell smoke alarms and I know they make great quality products as well. This device requires a R and C wire not installed on all HVAC system otherwise you need to purchase a separate PEK kit. Overall I'm very happy with this. 4 stars.
...
show more
Reviewed in the United States on August 27, 2026 by Review 8672
So far, so good! This connects so easily and works with Amazon Alexa. The controls are easy to figure out, it was so easy to install and I love the sleek, clean look it gives. My old thermostat was bulky in comparison. I love that I can control it remotely so I can leave the temperature moderate all day and cool or heat my house on the way home from work. Siterwell is a brand that is really coming up to compete with bigger names, at a great price. I recommend them
...
show more
Reviewed in the United States on August 20, 2026 by Michelle E