Which factor can increase the workload on an HVAC system?

Higher indoor humidity levels can significantly increase the workload on an HVAC system. When humidity levels are elevated, the air feels warmer than it is because moisture can make it harder for sweat to evaporate from the skin, so the system must work harder to remove that excess moisture to maintain comfortable indoor conditions. This requires additional cooling and dehumidification efforts from the HVAC system, resulting in increased energy consumption and strain on components like the compressor and blower.

In contrast, low indoor temperatures can actually lessen the burden on an HVAC system, as the temperature difference between indoors and outdoors drives heat transfer. Regular maintenance typically helps maintain system efficiency and performance, lowering the workload. Proper insulation reduces heat transfer between the inside and outside environments, contributing to energy efficiency and lessened demand on the HVAC system. Therefore, higher indoor humidity is the primary factor that elevates the workload on HVAC systems.