Manual J calculations

I have entered the exact same data on three “Free” manual J calculations sites.coolcalc.com (by far more detailed than the others)servicetitan.comand pdhvac.comThey all gave me completely different numbers.coolcalc 90,000 btu’s… I have entered the exact same data on three “Free” manual J calculations sites.coolcalc.com (by far more detailed than the others)servicetitan.comand pdhvac.comThey all gave me completely different numbers.coolcalc 90,000 btu’s…Read MoreGreenBuildingAdvisor