Stack effect usually occurs in taller buildings when indoor and outdoor temperatures are markedly different. Those factors result in differences in air pressure throughout the building, which leads to air movement to equalize that pressure. That creates negative effects on occupant comfort and energy bills.
What causes stack effect?
On cold days, heated indoor air is lighter than outdoor air, causing it to rise through the building and leak out through the upper levels. On warm days, the conditioned indoor air sinks because it is heavier than the warmer outdoor air. This results in conditioned air escaping through lower levels. In both cases, the HVAC system is forced to work harder, costing money and jeopardizing comfort.
Minimizing stack effect
To reduce those negative effects, contact a qualified professional to ensure your building is well-sealed and properly insulated according to energy efficiency standards. In some cases, mechanical airflow from ceiling fans can alleviate some issues. However, you should consult with a qualified engineer on the correct placement of fans in your building.
The negative effects of stack effect can lead to uncomfortable occupants, higher energy bills, and additional strain on your HVAC system.
