If you have two Honeywell thermostat you can turn off the systems by setting Heat to a low value on both systems
Then
Set temperature to a permanent hold
This Action will set your Honeywell thermostat to permanently hold the specified temperature until you change it.
And
Set temperature for a period of time
This Action will set your Honeywell thermostat to hold a temperature for a specified period of time. The schedule will resume when the time expires.
Explore more great ways to automate Location and Honeywell Total Connect Comfort