Energy needs at an early design stage

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Dear all,
Does anyone of you know a software program which I can use to calculate the energy needs of a building (installed power) at an early stage (design). With the usual programs like EnergyPlus or Trnsys you need to insert a lot of parameters to get the information, parameters which just aren?t allways available in the design stage.
The calculations don?t have to be very precise, I?m looking for a tool which can give an acceptable result, so we can give our customer an idea of how much power is needed for a certain building.

Greatfully,
Jens Wagemakers

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