# Heat gain, heat load, heat loss

Terms for the amount of cooling (heat gain) or heating (heat loss) needed to maintain desired temperatures and humidities in controlled air. Regardless of how well-insulated and sealed a building is, buildings gain heat from sunlight, conduction through the walls, and internal heat sources such as people and electrical equipment. Buildings lose heat through conduction during cold weather. Engineers use heat load calculations to determine the HVAC needs of the space being cooled or heated.

## Related Links

Heat loss, heat gain and cooling load calculations

Basics of heat loss, heat gain

Heat loss/heat gain considerations

Accurate Heating and Cooling Load Calculations

Heat Gain and Loss Explained – Mr. HVAC Software and Advice

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