Google’s Nest is experiencing a widespread outage that has knocked its line of thermostats offline, a particularly scary situation given the widespread heatwave across the United States right now. Members of our staff noticed the thermostats weren’t functioning properly this morning, in multiple states around the U.S., and a quick search on Twitter shows a similar story.

We tried calling tech support, which wasn’t particularly helpful, and noticed that some units started to come back online before they were disconnected again. The outage is not affecting other Nest products so far as we can tell; our Dropcams, which run on the same software, are performing fine. Here’s a sample of some of the messages crossing Twitter right now:

@nestsupport Nest thermostat says its online. Nest app says therm is offline even after restarting app. — R.Crawford (@rkcrawf) July 26, 2016

@nest @nestsupport It would be nice if your app would let users know when a device is offline due to server issues. — Chris Berry (@Chris_Berry) July 26, 2016

The Nest units can still be controlled manually, but anyone trying to keep AC on at another location – maybe at home from the office to keep pets cool – could be in a potentially worrisome situation as temperatures remain above 90 degrees in some locations.

Nest has not publicly posted any information. A Nest spokesperson was not immediately available for comment.

Update: Nest issued the following statement: