High superheat refers to a condition in refrigeration and HVAC systems where the refrigerant gas is significantly warmer than its saturation temperature. This typically indicates a lack of refrigerant or a restriction in the system’s flow.
The ‘Hold’ feature on an air conditioner or thermostat locks the current temperature setting, overriding any programmed schedule. It is used to maintain a consistent temperature until manually changed or canceled.
Airwave is a feature on Nest thermostats that improves energy efficiency by running the fan after the air conditioner compressor shuts off, circulating residual cool air from the coils into the home.
The ‘Auto’ setting on an air conditioning system allows the unit to automatically manage fan speed and temperature to maintain a set point. It reduces the need for manual adjustments by utilizing sensors to regulate the climate.
In HVAC, a ton measures cooling capacity equal to 12,000 BTU per hour. It originates from the heat required to melt one ton of ice in 24 hours. This standard helps size air conditioning systems for residential and commercial buildings.
Stage 1 on a thermostat refers to the first stage of heating or cooling operation, typically engaging the primary heat source or compressor at a lower capacity. It is part of a multi-stage system designed to improve energy efficiency and comfort by matching output to demand.
On Honeywell thermostats, CIRC (short for Circulate) is a fan mode that runs the fan periodically even when the heating or cooling system is off, helping to circulate air and maintain more even temperatures throughout the home without continuously running the fan.
In HVAC terminology, TAB stands for Testing, Adjusting, and Balancing. It is a systematic process to verify that heating, ventilation, and air conditioning systems deliver design airflow, water flow, and thermal conditions, ensuring efficiency, comfort, and indoor air quality.
Auxiliary heat (often labeled ‘Aux Heat’ on thermostats) is a secondary heating source triggered when a heat pump cannot meet the heating demand alone, typically during very cold weather or when the system is in defrost mode. It usually refers to electric resistance heating or a backup furnace.
On a Honeywell thermostat, ‘Recovery’ refers to a feature that pre-heats or pre-cools a home before a scheduled temperature change, ensuring the desired temperature is reached exactly at the programmed time. This adaptive function improves comfort and energy efficiency by learning how long the system needs to adjust temperatures.