An aquastat is a device used in hydronic heating systems for controlling water temperature.

BACnet is a Data Communications Protocol for Building Automation and Control Networks.

A blower door is a diagnostic tool designed to measure the airtightness of buildings.

Building automation describes the functionality provided by the control system of a building.

A carbon dioxide sensor or CO2 sensor is an instrument for the measurement of carbon dioxide gas.

For air filters that have air flowing through them, it is the fraction of particles (of a particular size distribution) that have been removed from the air times the CFM air flow rate through the device.

A gas detector is a device which detects the presence of various gases within an area, usually as part of a system to warn about gases which might be harmful to humans or animals.

A HVAC control system is a computerized control system for climate control in buildings.

A home energy monitor provides prompt, convenient feedback on electrical or other energy use.

LonWorks is a networking platform specifically created to address the unique performance, reliability, installation, and maintenance needs of control applications.

Minimum efficiency reporting value, commonly known as MERV rating, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to rate the effectiveness of air filters.

Communication is digital and bi-directional between the thermostat (master) and the boiler (slave), many different commands, status reports and requests for information between the two devices is possible.

The term Programmable Communicating Thermostat (PCT) is used by the California Energy Commission to describe programmable thermostats that can receive information wirelessly.

A programmable thermostat is a thermostat which is designed to adjust the temperature according to a series of programmed settings that take effect at different times of the day.

Psychrometrics is the measurement of the heat and water vapor properties of air.

Room temperature is a general term describing common indoor temperatures.

Smart thermostats are devices that can be used with home automation and are responsible for controlling a home's heating and/or air conditioning.

A thermostat is a device for regulating the temperature of a system so that the system's temperature is maintained near a desired setpoint temperature.

A Thermostatic Radiator Valve, (TRV), is a self regulating valve fitted to hot water heating system radiators.