Airflow
HVAC Buddy Duct Calc v.1.0.0.0
Are all Duct sizing calculators tedious? The wheel ductulators and computerized versions are good but you still are left entering different combinations given a set of design parameters.
DIY Zoning v.3.6.5
Step-by-step instructions for making your HVAC (Heating, Ventilation & Air Conditioning) system state-of-art.