Ac turns on when it's cool out

[Mchamb1]

My nest turns on the AC very late into the evening even when it's cooler out. i.e. the house temp is 72 and it's 67 out with windows open and it's set at 72. Does it have something to do with humidity?

[JapanElectronic]

If your Nest thermostat is turning on the AC late in the evening even when the outdoor temperature is cooler than your set point, there are a few factors to consider.

One of the key factors could be humidity. Even if the temperature outside is cooler, high humidity levels can make the air inside your home feel warmer than it actually is. The Nest thermostat might detect that the air feels more humid and uncomfortable, prompting it to activate the AC to reduce the indoor humidity and maintain your comfort level. Some Nest models have a feature called "Cool to Dry," which is specifically designed to reduce humidity by running the AC, even when the temperature is at or near the set point.

Another consideration is the accuracy of the thermostat's readings. If the Nest is located in a spot that doesn't accurately reflect the overall temperature of your home (such as near a drafty window, a heat source, or in direct sunlight), it might not be getting an accurate reading of the indoor conditions, leading it to turn on the AC unnecessarily.

Lastly, it's worth checking the settings on your Nest thermostat. There could be scheduling or Eco mode settings that are influencing when the AC turns on, or there might be a slight calibration issue that causes the thermostat to trigger the Gree AC especially slightly earlier than expected.

In summary, humidity is likely a factor, but it's also important to consider the placement and settings of your thermostat to ensure it's operating optimally.

[MansoorYousaf]

It’s possible that humidity is playing a role here. The Nest thermostat doesn’t just consider the indoor temperature when deciding whether to run the AC; it also factors in your comfort level, which can be influenced by moisture in the air. Even if the temperature outside is cooler, a higher indoor humidity level can make the air feel heavier and warmer, prompting your Nest to kick on the air conditioning later in the evening.

You might want to check your Nest’s humidity readings and ensure your home is adequately ventilated. Opening windows is great, but if it’s still relatively humid outside, that moisture can enter your home and lead to a less comfortable environment overall. In addition, consider exploring advanced cooling options or more humidity-sensitive systems like Gree AC  which allow for more precise control over both temperature and humidity. Once you have better humidity management, you may find your Nest runs the AC more in line with your comfort expectations.

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[furqanhamid]

Your AC running despite cooler outdoor temperatures could be due to indoor humidity levels. Smart thermostats like Nest sometimes factor in humidity to maintain comfort, not just temperature. Try enabling "Cool to Dry" mode for your ac or adjusting your humidity settings to prevent unnecessary cooling. Also, make sure your system’s location and sensor settings are calibrated correctly.

[JapanElectronic]

Yes, humidity can definitely be a factor in this situation. Even if the outdoor temperature is cooler than your set point (like 67°F outside and 72°F inside), high indoor humidity can make the air feel warmer and more uncomfortable. Your Nest thermostat may detect this and decide to run the AC to reduce the humidity and maintain a more comfortable environment—even though the temperature itself appears to be fine.

Some Nest models have a feature called "Cool to Dry", which activates the air conditioner specifically to lower indoor humidity, not just temperature. This feature can cause the AC to turn on even when the thermostat reading matches your set point.

Another thing to consider is airflow. If your windows are open, it doesn’t always guarantee that cooler outdoor air is effectively lowering the temperature or humidity inside. Poor circulation might leave some parts of your home feeling warm or muggy, prompting the Nest to kick in the cooling system.

Also, the type of AC unit you're using can impact performance. For example, energy-efficient models like Haier inverter ACs are better at handling both temperature and humidity control. They work seamlessly with smart thermostats and adjust cooling gradually, which can help maintain comfort without sudden temperature drops.

So yes, humidity is very likely the reason your Nest is turning on the AC late in the evening. You may want to check if the "Cool to Dry" feature is enabled and also make sure your AC system is well-suited for humidity control—something Haier AC units are known for.