Picture of the Honeywell WiFi Smart Thermostat RTH9580WF, home screen view.

Setting Temperature Differential Honeywell RTH9580WF

Temperature differential is the difference between the turn-on and turn-off temperatures on a thermostat, whether heating or cooling. It ranges between one and three degrees on common t-stats. Indeed, many of today’s t-stats let you set this value. They offer this to account for differing home types and locales, types of furnaces. In this piece, we discuss setting temperature differential on the Honeywell RTH9580WF smart WiFi t-stat.

Setting Temperature Differential on Honeywell RTH9580WF Intro

However, the Honeywell RTH9580WF WiFi thermostat does not provide temperature differential adjustments. It tries  to keep room temperature within one degree of set value. We’ve found this worked very well in our apartment central air / hydronic heating system.

Picture of the Honeywell WiFi smart thermostat RTH9580WF, home screen view. Setting temperature differential on Honeywell t-stats. 
Honeywell WiFi smart thermostat RTH9580WF, home screen view. Setting temperature differential on Honeywell t-stats.

But if you still get too hot or cold, then try the following tips.

System Type Choice can Affect Setting Temperature Differential on the Honeywell RTH9580WF

Make sure to set the System Type setting correctly.   Below are pictures of moving through the System Setup menus on the RTH9580WF.

1. Press the Menu Button

Then use the arrow keys to scroll to the System Setup button, as shown next.

Picture of the Honeywell RTH9580WF Smart WiFi Thermostat, Menu, System Setup button highlighted.
Honeywell RTH9580WF smart WiFi thermostat, Menu screen, with the System Setup button highlighted. Setting temperature differential on Honeywell t-stats.

2. Press the System Setup button.

The Language selection screen then appears as shown next.

Picture of the Language Selection screen on the Honeywell Smart WiFi Thermostat, model RTH9580WF.
Honeywell RTH9580WF Smart Thermostat, Language Selection screen.

3. Press the Next Button

The “Thermostat Installed In” screen appears, as shown next.

Picture of the Honeywell RTH9580WF smart WiFi thermostat, displaying the Thermostat Installed In screen. Setting temperature differential on Honeywell t-stats. 
Honeywell RTH9580WF smart thermostat, displaying the Thermostat Installed In screen. Setting temperature differential on Honeywell t-stats.

4. Again, Press the Next Button

The “Your Thermostat Location” screen then appears, as shown next.

Picture of the Honeywell RTH9580WF Smart Thermostat, displaying the Your Thermostat Location screen.
Honeywell RTH9580WF smart thermostat, displaying the Your Thermostat Location screen.

5. Press the Next Button

The “Your Thermostat Controls” screen then appears, as shown next.

Picture of the Honeywell RTH9580WF Smart WiFi Thermostat, displaying the Your Thermostat Controls screen.
Honeywell RTH9580WF Smart WiFi Thermostat, displaying the Your Thermostat Controls screen.

6. Once More, Press the Next Button

The “Your System Type” screen then appears, as shown next.  Check the setting here (found at Menu–>System Setup, and then press the Next button until you arrive at the System Type).   The choices there are Forced Air, Heat Pump, and Hot Water & Steam.

Picture of the Honeywell RTH9580WF WiFi smart thermostat, displaying the Your System Type screen. Setting temperature differential on Honeywell t-stats. 
Honeywell RTH9580WF WiFi smart thermostat, displaying the Your System Type screen. Setting temperature differential on Honeywell t-stats.

7. Choose your Climate Control System Type

Figure out the climate control system you have. Then tap the appropriate button.  That button highlights.

Warning

Be sure to set this parameter to the right value for proper operation of your HVAC system.

8. Then press the Next Button

What you see after this depends on which system type you chose in the last step.  In our case, we chose Forced Air.  So, the RTH9580WF prompted us for the type of forced air heat we have, as shown next. See this on the Your Forced Air Heating System Type screen, as shown next.

Picture of the Honeywell RTH9580WF Smart WiFi Thermostat, displaying the Your Forced Air Heating System Type screen.
Honeywell RTH9580WF smart WiFi thermostat, displaying the Your Forced Air Heating System Type screen. Setting temperature differential on Honeywell t-stats.

9. Pick the Right System Type

Then, check that the Forced Air Heating System Type setting is set correctly Pick either Gas / Oil, or Electric.  Ours is Gas / Oil.

Next, tap the corresponding button on this screen.  Note that your choice then becomes highlighted.

10. Tap the Next Button

Then, when pressing Next from here, the RTH9580WF prompts for the System Efficiency value by displaying the Efficiency of Your Heating System screen, as shown next.

Picture of the Honeywell RTH9580WF WiFi Smart Thermostat, displaying the Efficiency Of Your Heating System screen.
Honeywell RTH9580WF WiFi Smart Thermostat, displaying the Efficiency Of Your Heating System screen.

The choices are either Standard Efficiency (less than 90 percent efficient), and High Efficiency (greater than 90 percent efficient).  We opted for Standard Efficiency, as our forced air system draws in hot water from the building’s hot water system, in which the water is heated elsewhere in the complex.

11. Press the Done Button

12. Press the Home Button to finish Setting Temperature Differential on Honeywell RTH9580WF

This return the thermostat display to the Home screen.  The Home screen is shown in the first picture of this article.

13. Check How Comfortable your Home Is

Next, we let our system run for a few hours.  After that, we noted any uncomfortable temperature swings. We felt none. Chances are, you will feel none as well.  Why? Because the RTH9580WF regulates the furnaces quite tightly; especially when the Smart Response technology is ON.

But the room may still grow too cold or too hot. If so, then try changing the temperature.  Change it up or down respectively by a degree or two. This may help.  If not, then read on.

14. Indirect Setting Temperature Differential on Honeywell RTH9580WF Done!

Changing System Efficiency Setting can Affect Temperature Differential on this Honeywell T-Stat

If you decide that the temperature differential built into the RTH9580WF is too great, THEN try changing the System Efficiency setting as described above.  Find this setting as shown in the pictures above. This setting changes the number of times per hour the thermostat cycles the furnace on and off.  So you may see less temp spread if you raise the cycles per hour count.  Increase it by toggling between Standard and High efficiency.  Test out each setting to figure out which one gives the least differential.

Check for Proper Thermostat Position

Also, larger temperature differentials may occur if the t-stat is too close to a window or outer wall.  If so, this space needs longer heating from the furnace to reach the t-stat setting.

But places deep inside the house often need less heating to reach set point temperature.  The t-stat might call for enough heat to keep the spots around outer walls at the set temp. But the deeper spaces may get way too hot before the t-stat shuts down the furnace.  So, proper thermostat positioning is essential for controlling low-high temperature swings by the climate control system.

If you cannot re position the t-stat, then buy one with a differential setting.  Many of the older t-stats provide this.  But we do not find this on many of the most popular digital models today.  Again though, this Honeywell smart thermostat regulates room temps quite well without this setting.

Add Zoned Climate Control to Lower  Temperature Differential Setting on Honeywell RTH9580WF

Perhaps you like tinkering with climate control systems and have a little money to throw into the project. If so, you could add more t-stats throughout your house along with appropriate valves (depending on your system type). This can better regulate the temps in problem areas of the house.

Or, Just Put Up With The Temperature Swings

You may decide in the end, that you can put up with the temp swings.  Indeed all furnaces show SOME temperature differential.  If you do opt to just deal with it, you’ll save yourself some dollars.  But in most homes, the tips above do indeed lower temp swings.

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References for Setting Temperature Differential on The RTH9580WF Honeywell Thermostat

Revision History

  • 2019-07-10: Added key word targeting for ‘Setting Temperature Differential Honeywell’, removed ad code, and added more links and tags.
  • 2016-12-14: Added more links to the Suggested Reading section.
  • 2016-02-13: Originally published.