Enviracom is a protocol spoken by a subset of Honeywell thermostats and other HVAC hardware. This software provides a unix daemon which monitors Enviracom communications, allow the inspection of thermostat information, and provide a simple command line interface for controlling the operation of the thermostat.

The code was developed for NetBSD, and was untested under Linux.

The API and protocol are well documented. There is also a spec document for the required serial controller.

• A Thermostat and Contol module that speaks Enviracom. This code was developed against a VisionPro IAQ Touchscreen programmable thermostat (TH9421C1004), and equipment inteface module (THM5421C1008) bought as a kit (YTH9421C1002)

• A serial port or USB-serial adaptor.

• An Enviracom Serial Adaptor model W8735A/W8735A1005. These were discontinued in 2013 and may not even be available. The documentation for this module is included in this repository.

This repo is forked from the Enviracom project found on SourceForge by Scott Presnell. It was last updated 2013-03-25, besides updating the documentation to markdown.