We do HVAC Design for residential houses and are located in Houston, Texas. Here in Houston we know what the summer months can be like and the effects it can have on a building. While we do consider all heat gains in our load calculations, we aim to size systems properly. Over-sizing can also have problems, causing systems to short cycle and shut off before having a chance to remove the humidity out of the air.
Its not just Houston that we've done manual j, s, and d for. There's been many cities in the Gulf Coast. Texas cities such as San Antonio, Dallas, Fort Worth, and Austin. In Louisiana there's been New Orleans, Baton Rouge, Houma, and St Charles. In Florida with Tampa, Orlando, and Ft Lauderdale.