NATE Senior Efficiency Analyst case studies
NATE Senior Efficiency Analyst · Put your knowledge to work in context.
The NATE Senior Efficiency Analyst credential is listed by NATE (North American Technician Excellence) as one of its certification exams, aimed at HVACR technicians who want to demonstrate advanced skill in diagnosing and documenting system efficiency rather than only servicing equipment. NATE's public navigation describes its exams as technician certifications with published Exam KATEs (knowledge areas for testing), live online proctoring, and testing locations, and it separates contractor, technician, and homeowner audiences. The NATE Senior Efficiency Analyst case studies are 5 cases and about 2,788 words.
1Mismatched Split System With Low Airflow and High Indoor Humidity
A 4-ton R-410A condenser is paired with a 3-ton-rated air handler in a 2,200 ft² house. The homeowner reports long runtimes, 58% indoor RH at 76°F setpoint, and uneven temperatures.
572 words, about 3 min2R-410A Fixed-Orifice System With Low Superheat and High Subcooling
A 3-ton R-410A split system with a fixed orifice metering device is operating in cooling mode at 95°F outdoor dry bulb and 75°F indoor dry bulb/63°F wet bulb. Suction pressure is 118 psig, liquid pressure is 345 psig, suction-line temperature is 45°F, and liquid-line temperature is 112°F.
554 words, about 3 min3Verifying Rooftop Unit Savings After Economizer Repair
An energy services company is verifying savings after repairing the economizer on a 20-ton rooftop unit. The unit serves a retail space and has a supply-fan VFD on a separate circuit.
550 words, about 3 min4Zoned Duct System With Bypass Damper and High Fan Energy
A 5-ton constant-speed split system serves a two-zone house through a bypass damper. When both zones call, total airflow is 1,750 CFM at 0.60 in.
579 words, about 3 min5Packaged Rooftop Unit With Low Subcooling and High Superheat
A 5-ton R-410A packaged rooftop unit with a TXV serves a small office. On a 90°F outdoor day, return air is 78°F dry bulb/62°F wet bulb.
533 words, about 3 min