Actually, I have on back of the house an HVAC unit, right next to the back door (left side of the picture below). I don't know if this is a good spot to place it or not.
I have no knowledge of vent placement so if any of these designs do come to fruition (you know, when I win the Lottery or something) I would hire someone who knows. Same with electricity and plumbing, etc. Heck, that utility door visible in the above picture is for a space for the water heater, and I don't know if that's even a good placement either.
I've only placed the furniture decoratively, mostly as a way of showing what I had intended each room to represent, not exact placement for this very reason.
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