How to Install Ecobee SmartSensor

Overview

You have an Ecobee SmartSensor that is already paired with your thermostat and you need to physically install it in the right location for accurate temperature readings and reliable occupancy detection. The SmartSensor measures both temperature and room occupancy using a passive infrared (PIR) motion detector. Incorrect placement — too high, too low, near a heat source, or in a dead zone — causes inaccurate temperature readings and missed or false occupancy detections that make the thermostat heat or cool the wrong rooms.

Why This Happens in Real Homes

The number one mistake with Ecobee SmartSensor placement is mounting it too high on the wall. Heat stratification means a sensor at 8 feet reads significantly warmer than one at 5 feet. The second most common issue is placing sensors on exterior walls in older homes — the cold wall surface pulls the temperature reading down and the thermostat over-heats. The PIR occupancy sensor works well but has a 30-minute unoccupied delay by design — users sometimes think it is broken when the room shows occupied after they leave, but this is normal.

What's Included

• Room temperature monitoring
• Occupancy detection
• Multi-zone comfort
• Temperature balancing

Got your materials ready? Here's what to check first.

Before You Start

• Whole-home comfort balance
• Energy efficiency optimization
• Room-specific control
• Hot/cold spot elimination

Tools & Requirements

Installation Steps

1

Choose the right height: 5 feet off the floor

Mount the SmartSensor approximately 5 feet from the floor (chest height for most adults). This is the best height for both accurate room temperature measurement and PIR occupancy detection. Higher placement reads warmer temperatures because heat rises — a sensor mounted at 8 feet on a wall can read 3-5°F warmer than the actual room temperature at occupant level. Lower placement (on a table or shelf at 2-3 feet) may read cooler and has reduced occupancy detection range because the PIR sensor looks horizontally.

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2

Avoid heat sources and direct sunlight

Do not mount the sensor within 3 feet of a heating vent, radiator, fireplace, window with direct sunlight, or electronics that generate heat (TVs, computers, lamps). These heat sources cause the sensor to read artificially high temperatures, making the thermostat think the room is warm when it is not, and the system over-cools. Similarly, avoid exterior walls in poorly insulated homes — the sensor can read cooler than actual room temperature. Interior walls at chest height away from heat sources give the most representative readings.

3

Position for occupancy detection coverage

The SmartSensor PIR detector has approximately a 120-degree horizontal field of view and detects motion up to 15 feet away. Point the sensor face toward the area where people spend time — the center of the room, a seating area, or the hallway entrance. Avoid pointing it directly at a window (passing cars and animals can trigger false occupancy) or at a heating vent (warm air can trigger PIR). In a bedroom, point the sensor toward the bed so it detects sleeping occupants when they move. In a hallway, angle it down the length of the hall rather than across it.

4

Mount using the included stand or wall bracket

The SmartSensor comes with a magnetic stand and a wall-mount bracket. For shelf or furniture placement: set the sensor on the magnetic stand on a flat surface. The stand lets you angle the sensor. For wall mounting: use the included screw and anchor to mount the bracket, then snap the sensor onto the bracket. The wall mount is cleaner and puts the sensor at the ideal height. For renters: use a Command strip to mount the bracket without wall damage. The sensor weighs almost nothing, so adhesive mounting is reliable.

5

Verify placement by checking reported temperature

After mounting, wait 30 minutes for the sensor to acclimate to its environment. In the Ecobee app, go to Sensors and compare the temperature the new sensor reports versus the thermostat and other sensors. If the sensor reads more than 3°F different from a thermometer held at the same location, the sensor may be near a hidden heat source (hot water pipe in the wall, electronics nearby) or in a draft. Adjust placement until the reading matches a reference thermometer within 1-2°F.

6

Test occupancy detection

After mounting, sit in the room for 5 minutes, then check the Ecobee app: the sensor should show Occupied. Leave the room for 30 minutes and check again: it should show Unoccupied. Ecobee uses a 30-minute cooldown before marking a room as unoccupied to avoid rapid switching. If the sensor never shows Occupied when you are in the room, it is mounted too high, facing the wrong direction, or something is blocking the PIR lens. If it stays Occupied when the room is empty, it may be detecting pets, passing traffic through a window, or warm air from a vent.

Installation Tips

Still stuck? This is usually the deeper cause below.

Need More Help? Ecobee Support

Note: The contact information below connects you directly to Ecobee's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.

How Does Ecobee Compare?

Before replacing your Ecobee device, see how it stacks up against alternatives in our full comparison guides.