Modeling the energy and cost impacts of excess static pressure in central forced-air heating and air-conditioning systems in single-family residences in the U.S.

• We estimate the energy and cost impacts of excess static pressures in homes.
• The magnitude of energy and cost impacts varies by blower type and climate zone.
• Moderate increases in static pressures yield minimal changes in energy costs.
• More extreme increases in static pressure yield larger increases in energy costs.

Many central residential forced-air heating and air-conditioning systems contain high pressure drop elements such as high-efficiency or dust-loaded filters, dirty coils, or constricted or undersized ductwork, which are widely assumed to have substantial energy and economic impacts. However, the overall energy and cost consequences of excess static pressures have not been explored in depth across a wide range of climates, homes, or system characteristics. Therefore, we performed 780 annual building energy simulations using BEopt and EnergyPlus to predict the energy and cost impacts of realistic excess static pressures for typical new and existing single-family homes with both permanent split capacitor (PSC) blowers and electronically commutated motors (ECM) in 15 U.S. climate zones. Results demonstrate that excess static pressures can increase annual energy consumption and costs, but the magnitude varies by blower type and climate zone. Moderate increases in static pressures (i.e., from 50 to 150 Pa) were predicted to yield minimal increases in annual space conditioning energy costs (i.e., less than 3% across all homes, blowers, and climates), while more extreme increases in static pressure (i.e., from 50 to 350 Pa) were predicted to yield average increases in energy costs of ∼9% with ECM blowers and ∼18% with PSC blowers.