Which option would not effectively lower a building's energy load?

Installing multiple energy-inefficient appliances would not effectively lower a building's energy load because these appliances are designed to consume more energy compared to energy-efficient models. Energy-inefficient appliances may use outdated technology and lack features that minimize energy consumption, resulting in higher operational costs and increased energy demand.

In contrast, utilizing reflective roofing materials, maximizing thermal mass in construction, and optimizing HVAC systems are strategies aimed at reducing energy load. Reflective roofing materials help minimize heat absorption, thus lowering cooling loads. Maximizing thermal mass can effectively store and release heat, leading to stabilized indoor temperatures and reduced reliance on heating and cooling systems. Optimizing HVAC systems involves improving their efficiency, which can significantly reduce the energy consumed for heating and cooling, thereby lowering the overall building energy load.