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A Wi-Fi outage usually disables remote app features, not necessarily the controls on the device. A power outage is different: a battery-powered smart lock may keep working, while a thermostat’s temporary internal battery cannot power your home’s heating or cooling equipment. What remains available depends on the model, its power source, and its battery condition.
Power outage vs. Wi-Fi outage: what changes?
These failures affect different parts of a smart-home setup. A device can have power and work locally while its connection to the app or cloud is down. Conversely, a device with a temporary internal battery may stay on for a while after household power fails, then shut down as that backup runs out.
| Situation | What may still work | What may stop working |
|---|---|---|
| Wi-Fi or internet outage | Local controls, if the device has power and the model supports offline operation | App control, remote access, alerts, or cloud-dependent features |
| Household power outage | A battery-powered lock may continue operating; a thermostat may remain on temporarily using its internal battery | Powered HVAC equipment may stop, and a thermostat may eventually shut down when its backup charge is depleted |
An app showing a device as offline does not by itself mean its keypad, thumb turn, or on-device controls have stopped working.
What happens to a smart lock?
When household power goes out
Many residential smart locks have their own batteries, separate from household electricity. Schlage says its residential electronic and smart locks are battery-operated and continue functioning during a power outage, subject to the lock’s battery condition and model-specific functions. Check the manual for your exact lock rather than assuming every model behaves the same way. Schlage’s power-outage guidance was updated August 1, 2025.
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When Wi-Fi or internet goes out
Local entry may remain available even when you cannot operate the lock from an app or receive alerts. For the Nest × Yale Lock, Google says the lock communicates with Nest Connect over a low-power connection; Nest Connect then uses Wi-Fi to communicate with the app. The lock itself does not connect directly to Wi-Fi. Google says most passcodes work while the lock is offline, but scheduled-access passcodes are an exception. App control and alerts are unavailable during the outage. Google’s Nest × Yale offline guidance explains the behavior and connection setup.
Google also says the Nest × Yale deadbolt can be locked or unlocked from inside even if power is out or Wi-Fi is down. Do not generalize that statement to other locks; check the documentation for your model and keep its physical backup method in mind. Google’s Nest × Yale product guidance describes the inside thumb turn and other model-specific details.
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If a Nest × Yale Lock’s batteries are exhausted
Google documents a temporary emergency-power method for this model: hold a 9V alkaline battery to the terminals at the bottom of the lock, enter a passcode, then replace the lock’s batteries. This is specific to the Nest × Yale Lock; do not try it on another smart lock unless its manufacturer documents the same procedure. Follow Google’s instructions for the Nest × Yale Lock.
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When Wi-Fi or internet goes out
A Nest thermostat that is offline cannot be controlled in the app, according to Google. If the thermostat itself remains powered and responsive, you can still use its on-device controls to set the temperature. The loss of app access does not establish that the thermostat’s local controls have failed. See Google’s offline troubleshooting guidance for Nest thermostats.
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When household power goes out
Google says Nest thermostats can draw on an internal battery for a while when system power is lost. To conserve charge, they may disable Wi-Fi and other features; if power does not return, the thermostat can eventually shut down. Google does not give one universal runtime for this temporary backup in the guidance cited here, so do not assume a particular number of hours. Google’s thermostat power troubleshooting guidance describes this behavior.
The thermostat’s backup battery is not a backup power supply for a furnace, boiler, heat pump, or air conditioner. Whether heating or cooling continues during an outage depends on the HVAC equipment’s power source and any separate backup system. A thermostat staying on briefly does not mean the equipment it controls has electricity.
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- Long Battery Life & Low Battery Indicator: Powered by 4 AA batteries (not included), lasts up to 365 days. A red light indicator alerts you when battery level drops below 15%
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What to check before an outage
- Identify the exact model. Offline passcode rules, bridges, and emergency-power procedures vary by product.
- Check the lock’s battery condition. A battery-operated lock’s ability to work depends on its batteries having charge.
- Know which controls are local. Confirm how to operate the lock at the door or the thermostat at the wall without the app.
- Check the connection path. Some locks use a separate bridge or hub to reach the home network. Google says Nest Connect is the bridge for Nest × Yale; Nest Guard can no longer serve that role. Verify current support if you have a legacy setup.
- Plan separately for HVAC power. If heat or cooling during a power outage matters, check the equipment’s power requirements and backup arrangements rather than relying on the thermostat’s battery.
For product-specific exceptions, consult the current Nest × Yale offline guidance and Nest thermostat offline guidance.
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- ANYWHERE ACCESS: With built-in WiFi compatibility, you can easily and securely connect your Schlage Encode Deadbolt to your home WiFi network to control and monitor your home from anywhere with the Schlage Home app
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
