7-Day Programmable Thermostat RTH8500D

DIY Install
A 7-day thermostat with a large touch-screen display that’s easy to use, simple to install and packed with essential features such as separate programming for each day. Comfort and convenience in one thermostat. Available at select Canadian retailers.
Setup is simple and easy. Verify compatibility with your home heating and cooling system, and then remove your existing thermostat.
A versatile thermostat that’s valued and appreciated at home

You want a thermostat that’s easy to use, has great features and is simple to install. We have it — our 7-Day Programmable Thermostat RTH8500D. It’s a standout for its universal compatibility, plus has smart features for programming and temperature control. For example, Smart Response Technology automatically adjusts the heating/cooling of your home, so you’re comfortable at your programmed times. When you set it, you can expect it.

  • Seven-day programming
  • Backlit display
  • Filter changer reminder
  • Vacation hold
  • One-year limited warranty
  • DIY installation
Smart Response Technology
Continually adjusts heating/cooling of your home to keep you comfortable at programmed times.
Permanent Day/Time
Settings remain even in a power outage
Model/Sku #
Model number: RTH8500D

7-Day Programmable Thermostat RTH8500D

Honeywell explains Programmable Thermostat

Compatible with systems

  • This thermostat is compatible with heating and cooling systems, plus heat pump systems.
  • It is not compatible with electric baseboard heat (120/240V).

Now you're ready for the step-by-step instructions for installing the 7-Day Programmable Thermostat. Simply choose the option you prefer:

Video-Guided Installation

The video below shows the installation process from start to finish.

Quick Start Guide PDF

Download the Quick Start Guide in the resources section below for detailed instructions on installing our 7-Day Programmable Thermostat RTH8500.

7-Day Programmable Thermostat RTH8500D Installation video

How to install and program your Honeywell thermostat