Sorry for cross-posting,

Does anyone use MS Visio for sketching HVAC diagrams?
Is it a good alternative to Ms Word, which is somehow tolerable for simple
diagrams, but gets really out of hands for bigger diagrams?
The shapes, which are included in Visio, are they helpful, meaningful, give
professional look?

Somebody is using Excel (might be lacking flexibility when topology is
unknown).
Somebody is using Inkscape.
Any other thoughts
Thank you,

Pavel Dybskiy