Which load calculation software do you recommend?? I have looked at wrightsoft, and elitesoft both are ACCA recognized, both are almost $500.00. Has anyone here used any of this software?? Johnrwhite.com has a software program for around $200. This is not recoginzed by ACCA but uses manual J for the calculations. I was leaning twards the $200 software, currently i have a manual J worksheet I use but thought it would be faster to have the software on my tablet. The Johnrwhite program does duct design and sizing also, but the other 2 charge another $200.00 for each. I would rather use a ACCA recoginzed software, but that is a lot of extra money to do the same task!!