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I'm definitely biased but I want to second @Julien's suggestion. I think Ladybug + Honeybee addresses your needs for early stages of design. Ladybug provides a great range of weather data analysis, and Honeybee supports connections to Radiance, Daysim, EnergyPlus and OpenStudio. We also developed several components for result visualization for Ladybug+Honeybee.

Since the development is on top of Grasshopper iterative modeling is pretty easy in comparision to other platforms. For more advanced analysis you can always export your model to OpenStudio for deisgning advanced systems.

Here is a presentation that we did at IBPSA-NYC last year. It should give you a better idea of the possibilities or you can watch these videos:

Part 1: https://vimeo.com/107501953 Part 2: https://vimeo.com/107502226

I'm definitely biased but I want to second @Julien's suggestion. I think Ladybug + Honeybee addresses your needs for early stages of design. Ladybug provides a great range of weather data analysis, and Honeybee supports connections to Radiance, Daysim, EnergyPlus and OpenStudio. We also developed several components for result visualization for Ladybug+Honeybee.

Since the development is on top of Grasshopper iterative modeling is pretty easy in comparision comparison to other platforms. For more advanced analysis you can always export your model to OpenStudio for deisgning designing advanced systems.

Here is a presentation that we did at IBPSA-NYC last year. It should give you a better idea of the possibilities or you can watch these videos:

Part 1: https://vimeo.com/107501953 Part 2: https://vimeo.com/107502226