How does outdoor air temperature affect HVAC system efficiency?

Outdoor air temperature has a significant effect on HVAC system efficiency. Extreme temperatures, whether very cold or very hot, can increase energy usage for several reasons. In hot weather, for instance, the air conditioning system must work harder to cool the indoor environment, particularly when the outside temperature rises beyond comfortable levels. This often results in longer run times for the compressor, which increases energy consumption.

Similarly, in cold weather, heating systems need to operate more intensively to achieve the desired indoor temperatures. The difference between indoor and outdoor temperatures creates a larger thermal load, compelling the HVAC system to exert more energy to maintain comfort levels.

By understanding this relationship, facility managers can optimize HVAC operations and potentially adjust settings or schedules to mitigate excessive energy usage during extreme weather conditions. This knowledge plays a crucial role in maintaining system efficiency and managing energy costs effectively.