[EnergyPlus_Support] Insulating the roof

[Daniel Solís <danielsolis79@xxxxxxxxxxxx>]

Hi E+,

I simulated a house with DesignBuilder in a very hot and dry climate. 
I insuated the roof with EPS polyestyrene. No matter how much 
insulation I used, the results were almost the same.

In DB forum I got the answer that no matter the climate, the 
temperature and HVAC consuption is entirely driven by internal gain 
and so there is no difference insulating the roof. 

It's all the opposite I have read in the state of the art. Even, in 
that specific city I got the weather file from, there is a government 
support for people to insulate their roofs because they have a lot of 
measurements proving an HVAC reduction of 15-20%.

Since DB uses E+ as core program, I'm asking you directly what's 
happening,

Thanks,

Daniel


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