Yes, Nest and Honeywell Evohome both let you control several houses or locations from one app. So, for example, you could easily control your main home and a holiday home from the same app, as long as they both had either Nest Thermostats or Honeywell Evohome multi-zone heating installed.

This feature is also useful if you rent or lease multiple properties and want to control the heating remotely.

The Nest app can control up to 3 homes or locations. For more details see the article on managing multiple homes on the Google website. To control more than this number you would have to set up multiple Google Nest accounts and have multiple Nest apps running.

The Honeywell Total Connect Comfort app can control up to 99 applications. For further details click here.