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Hello @behmoonesi

1. This is working as expected. The annual simulation requires the SizingPeriod:DesignDay object and the inputs for this object are set in the Location tab. See example below:

1. The change you are making will increase the heating system sizing but the heating consumption will depend of the weather hourly conditions (epw file), the space's heat balance, and the HVAC system capacity to meet the requirements. My suggestion is to check the hourly results for the heat balance and system loads to have a better understanding of the model. One question for you, does the heating demand remains the same in both your case studies?

2. I disagree with you as this is not as linear as you think. If you have an undersized HVAC system that operates based on performance curves then the equipment might be at maximum operating capacity and consequently less efficient and with higher energy consumption.

Another question, is the indoor setpoint temperatures being met in both cases? If not, then there might be an issue with the HVAC system.

One final suggestion is to check for warnings and errors in the eplusout.err file that might indicate issues with your HVAC system.

Hello @behmoonesi

Another question, is the indoor setpoint temperatures being met in both cases? If not, then there might be an issue with the HVAC system.

One final suggestion is to check for warnings and errors in the eplusout.err file that might indicate issues with your HVAC system.