GA HVAC case studies
GA HVAC · Put your knowledge to work in context.
The Georgia Conditioned Air Contractor license is the state credential that authorizes a business to install, alter, service, and repair heating, ventilating, and air-conditioning systems for the public in Georgia. It is issued at the company level, so the qualifying individual typically pairs a trade examination with a separate business-and-law examination before a firm can be licensed to contract for conditioned air work. The GA HVAC case studies are 5 cases and about 3,947 words.
1Replacement Sizing After an Envelope Retrofit
A 1978 ranch in Atlanta, 2,000 ft² with 8 ft ceilings. The owner has replaced the windows, air-sealed the attic floor, and blown R-38 over existing R-11; the duct system is still R-4 flex lying on the attic floor of a vented attic that reaches 135°F in August.
716 words, about 4 min2Walk-In Cooler Starved Evaporator Diagnosis
A 10 ft × 12 ft × 8 ft walk-in cooler holding dairy at 35°F in a restaurant kitchen runs R-404A on a 1.5 hp semi-hermetic condensing unit with an air-cooled condenser on a kitchen mezzanine where the air is 95°F. Design evaporator TD is 10°F.
703 words, about 4 min3Depressurization and Combustion Air in a Tight House
A 1,600 ft² single-story house with 8 ft ceilings was air-sealed to 2.0 ACH50 during a weatherization job. It has two 80 CFM bath fans, a new 300 CFM range hood, and a 40,000 Btu/h natural-draft (atmospheric) water heater and a natural-draft furnace sharing a 4 ft × 6 ft × 8 ft closet with a louvered door.
787 words, about 4 min4Adding Load to an Existing Low-Pressure Gas System
A 1955 house has a 100,000 Btu/h natural-draft furnace and a 40,000 Btu/h water heater fed from a 7 in. meter through a single 1/2 in.
891 words, about 4 min5VAV Rooftop Short on Airflow During TAB
A 10,000 CFM packaged VAV rooftop unit with 15% minimum outdoor air serves four zones. Design total static is 2.0 in.
850 words, about 4 min