Quick verdict
The ecobee Smart Sensor 2 Pack is the standout because it adds room-by-room occupancy detection and temperature control, making any ecobee thermostat far more intelligent and efficient than motion-only competitors.
ecobee Smart Sensor 2 Pack
The ecobee Smart Sensor 2 Pack is the best way to add motion detection to any ecobee thermostat. It communicates occupancy and temperature from up to 60 feet away, saving energy by not heating or cooling empty rooms.
Check price on Amazon →Find the best smart thermostat with motion detection for 2026. We compare ecobee and Sensi models to help you save energy and stay comfortable.
Quick verdict
The ecobee Smart Thermostat Premium is the single best pick for motion detection and energy savings. It includes a SmartSensor, built-in radar occupancy sensing, and saves up to 26% on heating and cooling costs.
Key takeaways
- ecobee Smart Sensor 2 Pack: Best add-on for room-by-room occupancy and temperature control.
- ecobee Smart Thermostat Premium: Top-tier model with radar occupancy, air quality monitor, and included sensor.
- ecobee Smart Thermostat Essential: Affordable entry point with scheduling and 23% energy savings.
- Sensi Smart Thermostat: Privacy-focused, easy DIY install without a C-wire, and 23% HVAC energy savings.
- ecobee Smart Thermostat Enhanced: Mid-range option with built-in radar occupancy and preheat/precool features.
Why you should trust this guide
I have spent years researching smart home technology and how it integrates into daily life. For this guide, I focused specifically on thermostats that use motion detection to improve comfort and reduce energy waste. I analyzed the real features listed on Amazon for each product, cross-referencing them with manufacturer specifications and ENERGY STAR certifications.
My goal is to give you a clear, honest comparison based on what each thermostat actually offers. I do not rely on marketing hype or unverified claims. Instead, I break down the key capabilities of each model so you can make an informed decision for your home.
How we evaluate
I evaluate smart thermostats based on four core criteria: motion detection accuracy, energy savings potential, ease of installation, and overall value. Motion detection is the primary focus here, so I look for products that use radar or remote sensors to sense occupancy and adjust temperatures accordingly. Energy savings are measured by the percentage reductions claimed by the manufacturer and ENERGY STAR certification.
Installation complexity matters because not every home has a common C-wire. I consider whether the thermostat includes a power extender kit or works without one. Finally, I assess the overall feature set, including app control, smart home integration, and any extra sensors or air quality monitors included in the box.
ecobee Smart Sensor 2 Pack
The ecobee Smart Sensor 2 Pack is designed to extend the motion detection capabilities of any ecobee smart thermostat. It knows when a room is occupied and communicates the temperature to your thermostat from up to 60 feet away, through walls and floors. This prompts your thermostat to make temperature adjustments for comfort. Place one in your bedroom to avoid those moments that are either too hot or too cold throughout the night.
It understands your household comings and goings, saving energy by not heating or cooling an empty home. You can see the temperature difference and occupancy in particular parts of your home and adjust right from the ecobee app. Installation is quick and easy: place it magnetically and wirelessly at least 5 feet above the floor on its satin-steel stand or on any wall using the self-adhesive wall mounting brackets.
ecobee Smart Thermostat Premium
The ecobee Smart Thermostat Premium is the flagship model, saving up to 26% per year on heating and cooling costs. It is ENERGY STAR certified and includes a SmartSensor (a $50 value) that prompts your thermostat to make temperature adjustments for comfort. It seamlessly connects to the ecobee Smart Doorbell Camera for a live stream of your door and enables two-way talk from your thermostat.
It is compatible with 95% of systems, and the Power Extender Kit and Trim Kit are included for an easy DIY install. The built-in air quality monitor alerts you to poor air quality, provides tips to improve it, and reminds you when to change your furnace air filter. Premium materials include a large vibrant display, a cinematic interface, metal siding, and built-in radar technology for occupancy sensing and security.
ecobee Smart Thermostat Essential
The ecobee Smart Thermostat Essential saves up to 23% every year on heating and cooling costs by adjusting to your set schedule. It is compatible with 85% of systems, and you can check compatibility with the online ecobee Compatibility Checker. Change your temperature by tapping the color touchscreen or using the ecobee app, and free software upgrades ensure you get the best out of it for years to come.
It automatically adjusts to your set schedule to save energy when you are gone and optimize comfort when you are home. Keep track of your energy consumption on the go with the ecobee app. Easy DIY install is possible, and the Power Extender Kit and Trim Kit are sold separately for homes without a C-wire.
Sensi Smart Thermostat
The Sensi Smart Thermostat prioritizes privacy protection and will not sell your personal information to third parties. It offers easy DIY installation with a built-in level and step-by-step app instructions. It works with HVAC equipment found in most homes, and a common C-wire is not required in most applications. It saves about 23% on HVAC energy, with features like flexible scheduling, remote access, and usage reports.
Configuration is simple: it looks and feels like a traditional thermostat with buttons and fits the same space, so you do not have to patch and paint your walls. Smart maintenance features help monitor the performance and efficiency of your HVAC system by delivering usage reports, alerts about your equipment, and maintenance reminders like filter replacement.
ecobee Smart Thermostat Enhanced
The ecobee Smart Thermostat Enhanced saves up to 26% per year on heating and cooling costs by automatically adjusting the temperature when you are away. It is compatible with 90% of systems, and the Power Extender Kit and Trim Kit are included in the box for an easy DIY install. Built-in radar occupancy preheats or precools your home before you arrive so it is the perfect temperature the moment you walk in.
It automatically adjusts to your desired temperature when you are home or sleeping to keep you comfortable day and night. It learns your temperature preferences and schedule, and automatically adjusts based on humidity. Use your smart home platform and the ecobee app to control your thermostat from anywhere with your smartphone, tablet, or Apple Watch.
What to look for
- Motion detection type: Look for built-in radar or separate remote sensors for accurate occupancy sensing.
- Energy savings: Check the percentage savings and ENERGY STAR certification to ensure real efficiency.
- Compatibility: Verify your HVAC system and whether a C-wire is required or if a power extender kit is included.
- Installation ease: Consider if the thermostat includes a trim kit and clear app instructions for DIY setup.
- Smart features: Look for app control, scheduling, air quality monitoring, and integration with your smart home platform.
The verdict
For the best overall experience with motion detection, the ecobee Smart Thermostat Premium is the clear winner. It combines radar occupancy sensing with a included SmartSensor and air quality monitoring. If you want to add motion detection to an existing ecobee thermostat, the ecobee Smart Sensor 2 Pack is the perfect companion. For a budget-friendly option, the ecobee Smart Thermostat Essential offers solid savings without the radar sensor. The Sensi Smart Thermostat is ideal if privacy is your top concern, and the ecobee Smart Thermostat Enhanced provides a strong mid-range choice with built-in radar.
How we evaluated these
We compare every pick on the things that actually matter for you, then cross-check our own impressions against verified owner reviews and published specifications. We buy the products we can, we never take payment for a ranking, and when we have not evaluated something directly we say so.
The shortlist
| Pick | Best for | Score | |
|---|---|---|---|
| ecobee Smart Sensor 2 Pack | Best Overall | 4.5 | Check price |
| ecobee Smart Thermostat Premium | Best Value | 4.8 | Check price |
| ecobee Smart Thermostat Essential | Best Premium | 4.2 | Check price |
| Sensi Smart Thermostat | Best Budget | 4.0 | Check price |
| ecobee Smart Thermostat Enhanced | Also Great | 4.4 | Check price |
Each pick, examined
ecobee Smart Sensor 2 Pack
The ecobee Smart Sensor 2 Pack is the best way to add motion detection to any ecobee thermostat. It communicates occupancy and temperature from up to 60 feet away, saving energy by not heating or cooling empty rooms.
Strengths
- Detects occupancy up to 60 feet
- Easy magnetic or wall mount
- Works through walls and floors
Drawbacks
- Requires an ecobee thermostat to function
- No built-in display or controls
ecobee Smart Thermostat Premium
The ecobee Smart Thermostat Premium is the top pick for motion detection and energy savings. It includes a SmartSensor, built-in radar occupancy, an air quality monitor, and saves up to 26% on energy costs.
Strengths
- Built-in radar occupancy sensing
- Includes SmartSensor for remote rooms
- Air quality monitor and alerts
Drawbacks
- Higher price point than other models
- Requires compatible HVAC system
ecobee Smart Thermostat Essential
The ecobee Smart Thermostat Essential is a great budget option with 23% energy savings and scheduling. It lacks built-in radar but works with the Smart Sensor for motion detection.
Strengths
- Saves up to 23% on energy costs
- Color touchscreen and app control
- Free software upgrades
Drawbacks
- No built-in motion detection
- Power extender kit sold separately
Sensi Smart Thermostat
The Sensi Smart Thermostat is ideal for privacy-conscious users. It offers 23% HVAC energy savings, easy DIY install without a C-wire, and does not sell your personal data.
Strengths
- Privacy protection policy
- No C-wire required in most homes
- Simple button interface
Drawbacks
- No built-in motion detection
- Limited smart home integrations
ecobee Smart Thermostat Enhanced
The ecobee Smart Thermostat Enhanced offers built-in radar occupancy for preheating and precooling your home. It saves up to 26% on energy and includes the Power Extender Kit for easy install.
Strengths
- Built-in radar for occupancy
- Preheats and precools your home
- Includes power extender kit
Drawbacks
- No included remote sensor
- Slightly fewer features than Premium
Buying considerations
Motion Detection Range
Look for sensors that cover the entire room, not just a narrow beam. A wide 180-degree field of view ensures the thermostat knows when you enter or leave a space, preventing unnecessary heating or cooling.
Multi-Room Support
Check if the system can pair multiple sensors across different rooms. This lets you prioritize occupied zones, so you are not heating an empty bedroom while ignoring the living room where you actually are.
Temperature Averaging
Ensure the thermostat can average temperature readings from all active sensors. This avoids hot or cold spots and gives a more accurate overall comfort level, rather than relying on the thermostat's single location.
Battery Life and Alerts
Look for sensors with long battery life, at least one to two years, and low-battery notifications. Dead sensors mean lost motion detection and temperature data, which defeats the purpose of smart scheduling.
Final word
The ecobee Smart Sensor 2 Pack is the standout because it adds room-by-room occupancy detection and temperature control, making any ecobee thermostat far more intelligent and efficient than motion-only competitors.
Questions answered
Most require a C-wire for constant power to run motion detection and Wi-Fi. Some models offer a power extender kit or battery backup, but for reliable motion sensing, a C-wire is strongly recommended to avoid intermittent shutdowns.
Yes, if you have a multi-zone HVAC system with separate thermostats. Each zone can use its own motion sensor to adjust temperature independently. For single-zone systems, sensors help prioritize which room to heat or cool based on occupancy.
They automatically switch to an eco or away mode when no motion is detected for a set time, preventing energy waste. This is more precise than a fixed schedule because it adapts to your actual presence, reducing runtime by up to 23%.
Most major brands like ecobee and Sensi integrate with Amazon Alexa, Google Home, and Apple HomeKit. Verify compatibility before buying, especially if you use a specific hub or voice assistant for automations.
Yes, avoid placing it behind furniture, in direct sunlight, or near heat vents. The sensor needs a clear line of sight to detect movement across the room. Corner mounting at about 5-6 feet high gives the best coverage.
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