Why Is My Nest Thermostat Not Cooling? Solutions and Troubleshooting

Nest Thermostats have revolutionized the way we manage our home’s temperature, offering a blend of convenience, energy efficiency, and smart technology. But like all technology, sometimes things don’t work as planned.

If your Nest Thermostat isn’t cooling your home as expected, it can be frustrating.

But don’t worry — this blog post is here to help you identify and resolve common issues that might be preventing your Nest Thermostat from effectively cooling your home.

1. Incorrectly Configured Settings

Sometimes, the problem can simply be due to improperly configured settings. Below are some setting-related issues that you might want to check.

First, make the thermostat is switched on, and is set to Cool mode. I know that’s a bit obvious, but you’d be amazed how often I overlook this on my own Nest thermostat.

Make sure that you’ve set the thermostat to cool!

If it’s on cool, then move on to these steps:

Schedule Settings

  • Is the schedule correct? Nest Thermostats have a scheduling feature. It’s possible that it’s set to a higher temperature than you want during certain times of the day. Review your schedule settings to confirm.
  • Keep in mind that the Nest thermostat is designed to learn your routines and change its temperature automatically. Sometimes it might switch to a higher temperature setting without you doing anything. Check to make sure it’s set where you want it.

Eco Temperature

  • Are Eco Temperatures set too high? When your home is set to Eco Temperature, the cooling might not activate as you expect. Eco Temperatures are often set higher to save energy when no one is home.
Check your Eco temperatures

Home/Away Assist

  • Is Home/Away Assist misreading your location? This feature can automatically adjust the temperature based on whether it detects anyone home. If it’s not working properly, it may be keeping your home warmer than you’d like.
  • Check in the Nest app to ensure that you have Home/Away Assist switched on and that it’s correctly configured on your phone.

2. Hardware Issues

Sometimes, the problem may be related to your HVAC system or the Nest Thermostat itself. Here are some hardware-related issues to look out for:

Thermostat Battery

  • Is the battery level low? When the battery power is low, the Nest Thermostat can behave erratically or fail to communicate with the HVAC system.
  • Normally, the Nest thermostat charges itself. But sometimes it can get behind, especially if you’ve had a power outage. Remove the front of the thermostat and plug it into USB to charge.

HVAC System

  • Is the HVAC system functioning properly? Sometimes, the issue isn’t with the thermostat but with the cooling system itself. If the system is old or hasn’t been maintained, it may fail to cool the house effectively.
  • I had an issue where my HVAC filters got clogged and the systems stopped working. Fixing them and waiting for it to de-ice solved my issue. Likewise, I’ve had capacitors die, fuses blow, and more. In all these cases, it was the AC itself (not the nest thermostat) that was to blame.

Wiring Issues

  • Are there any wiring problems? Incorrect wiring during installation can lead to the thermostat not being able to control the cooling system. Go into the Settings on your Nest thermostat and make sure the wiring is detected properly.
Check that wires are connected properly

3. Wi-Fi Connectivity Problems

Nest Thermostats rely on a Wi-Fi connection to function optimally. If your device is having trouble connecting to your network, it may not operate correctly.

  • Check your router: Ensure your router is working properly and the thermostat is within range.
  • Restart your Nest Thermostat and router: Sometimes, a simple restart can fix connectivity issues.
  • Check for Wi-Fi interference: Other electronic devices can sometimes interfere with your Wi-Fi signal.

Here’s how to restart:

Potential IssueSolution
Low BatteryCharge the Nest Thermostat
Incorrect ScheduleAdjust the schedule to your preference
High Eco TemperatureLower the Eco Temperature settings
HVAC issuesConsult with a HVAC professional
Wiring problemsConsult with a professional or Nest support
Wi-Fi IssuesRestart the router and the Nest Thermostat

4. Software Glitches

Occasionally, the software on your Nest Thermostat might experience glitches, affecting its cooling function.

  • Restart your Nest Thermostat: Like any electronic device, a simple restart can often resolve many issues.
  • Update the software: Ensure your Nest Thermostat is running the latest software version. It should update automatically, but if your Wifi has been down, you might need a software update.


When your Nest Thermostat isn’t cooling your home as expected, it can be due to a range of issues from simple setting misconfigurations to hardware problems. By systematically working through these common issues and solutions, you can often resolve the problem yourself.

However, if your Nest Thermostat is still not cooling your home after trying the steps above, it may be time to consult with a professional or reach out to Nest’s customer support. They can help diagnose and fix more complex issues that could be affecting your thermostat’s performance.

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