I find Revit very helpful in realtime solutions. Most of the manufacturers are providing RVT files of their products online. Well, comparing with Carrier and Trane software is not apple to apple thing. Perhaps, the recent Revit versions let you have analysis online with a membership fee.
I rate...
Try Revit MEP. You can design and run analysis. It is a comprehensive software, calculating loads, duct and pipe designs, equipment selection, simultaneously building drawings, Equipment Schedules, Bill of Quantities, etc. It is also helps in coordination with other services.
There are certain aspects you can make in the layout/structure of the building to improve the thermal balance, we usually define this as "Passive Airconditioning". This means we do not need to actively put some air conditioner for airconditioning. These measures may include:
a) a very...