Manual J Calculations Add 10 Years to Unit Lifespan Through Accurate Sizing
https://padlet.com/ccyrus1795lyphl/bookmarks-z2m77pw1up4acetf/wish/Xb8YaLMLdndJQyn1
An HVAC system typically lasts 15 to 20 years, but correct Manual J load calculation and proper tonnage sizing can add a full decade to that lifespan