How to install ecobee3 lite.

In most homes, installing an ecobee thermostat is an easy process that takes about 45 minutes. Follow the steps below or scroll down for installation guides and videos, wiring diagrams, troubleshooting tips and more.

  1. Check compatibility with your heating (and cooling) system
  2. Download the ecobee app to install your thermostat
ecobee lite smart thermostat

Download the ecobee app.

Installation Videos.

Install with a C wire

Install without a C wire

Guides and manuals

Not the DIY type?

Hire a professional installer to get your ecobee device up and running quickly.

Brendon Aldridge, owner & technician

ecobee-trained professional

Find a pro

If your ecobee doesn’t turn on, please try these steps.

For more help with your installation questions, visit the ecobee Support Center.

Here's what you'll find in the box.

  • Illustration of ecobee3 lite

    ecobee3 lite

  • illustration of ecobee3 lite backplate


  • illustration of ecobee3 lite trim plate

    Trim plate

  • illustration of ecobee3 lite power extender kit

    Power extender kit (PEK)

Also included:

  • Screws and drywall plugs
  • Wire labels
  • Installation guide

Tools you'll need:


  • Drill (3/16” drill bit)

  • Flathead screwdriver

  • Phillips screwdriver


  • Hammer

  • Pencil

  • Wire stripper

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