I am aware that there are many emerging standards and products all focused on making my internet-connected home accessible from anywhere. I am exclusively interested in a solution where there is no internet connectivity - though there is a wired and wireless LAN and a range of computers/tablets - etc.
I am keen to establish a smarter control of heating - and to monitor the effects by collecting data that I can later analyse (on Linux by writing scripts etc.) I'd like to be able to implement an arbitrary heating regime driven by a range of sensors. I'd be happy if this were through a polished GUI - or if I were to roll-my-own using an API to low-level interactions with the sensors and thermostat. I would not be happy if (at any stage) any device at the house needed to be connected to the internet.
I am struggling as I only seem to be able to find advertisements for the-latest-and-greatest cloud-controlled systems. Is it possible to buy basic 'smart' thermostats and sensors that would work (directly) on a non-internet-connected network - ideally where I could control them from a standard Linux server? If so, what should I search for? Are there any open standards that I could choose to minimise the effort required to establish programmatic access to the features of the devices from my private LAN?