Heat loss and heat gain calculator for sizing furnaces and air conditioners.
Pros: It was easy to use and great for solving some of my HVAC problems without lots of time using a calculator.
Cons: It takes time to get used to finding what you need to help you.
The more I use it the simpler it gets I trust the answers more than doing it on paper.
Overall: I used it for duct sizing. Heating and cooling load calculations
A/C tonnage sizing and matching load sizes with equipment sizes.