different strokes for different folks
I bought Wrightsoft with Draw but tried the demo of HVAC-Calc and found it to be much much faster and easier to use, so even though I spent a bundle on RightSuite I went ahead and bought HVAC-Calc. I have more than made up the money I lost on RightSuite with the time I have saved by using HVAC-Calc! Anyway, you should download them both and decide for yourself. I must mention though that the support from HVAC-Calc is far better and the licensing allows you to put it on 3 computers, no fussy copy protection. Good luck to you!