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I'm simulating in EnergyPlus a room to analyze different measure to reduce the energy demand. I changed the U- value of simple glazing system, from 5.8 to 3.3 to 1.4, with the same solar heat gain coefficient of 0.8. I thought the cooling demand would have incremental reducing, but it is the opposite: When i have lower u-value, i obtain higher cooling load. I'm working with cooling ideal system. Is there something I am doing wrong? should i check another parameter? i really will appreciate your suggestions.

I'm simulating in EnergyPlus a room to analyze different measure to reduce the energy demand. I changed the U- value of simple glazing system, from 5.8 to 3.3 to 1.4, with the same solar heat gain coefficient of 0.8. I thought the cooling demand would have incremental reducing, but it is the opposite: When i have lower u-value, i obtain higher cooling load. I'm working with cooling ideal system. Is there something I am doing wrong? should i check another parameter? i really will appreciate your suggestions.