We Offer Residential HVAC Design and Load Calculations in Orange County When you’re shopping for appliances nowadays, your choices are narrowed down to the ones that save the most energy. However, it’s tricky to create efficiency if your home has certain problems, such as leaks or insufficient insulation. Fortunately, it’s simple to have someone conduct a residential HVAC design and load calculation. HVAC systems load calculation process is accomplished by incorporating the Air Conditioning Contractors of America (ACCA) manual J load calculation method. We use industry approved modeling software to help us determine the building envelop's heating and cooling needs. Call us for more info!