The planning aid for determining or judging physical parameters in building and for planning technical systems for buildings such as heating systems, includes a printed base (1) with at least two guides each for a respective printed slider (2,3). Scales (4,5,6) are provided on at least part of all sides of the guides. Associated additional scales (7,8,9,10) or messages (9) are associated with the sliders and/or can be combined when the sliders are in different positions.
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