BPI AC/Heat Pump case studies
BPI AC/Heat Pump · Put your knowledge to work in context.
The BPI AC / Heat Pump credential is one of the certifications listed in the Building Performance Institute's public certifications directory on bpi.org, alongside entries such as Building Analyst Technician, Energy Auditor, Quality Control Inspector, and Heating Professional. BPI describes its mission as advancing the home performance industry through nationally recognized standards and credentials intended to ensure homes are comfortable, healthy, safe, durable, and energy efficient, and it presents its credentials as a symbol of excellence for home performance professionals. The BPI AC/Heat Pump case studies are 5 cases and about 2,750 words.
1Oversized Replacement in a Tight Duct System
A homeowner replaces a 20-year-old 2.5-ton (30,000 Btu/h) split system in a 1,600 sq ft house in a mixed-humid climate (design 95 F outdoor, 75 F indoor). The existing ductwork is R-6 flex in a vented attic, with a measured external static pressure of 0.82 in.
578 words, about 3 min2Cold-Climate Heat Pump With Auxiliary Heat Lockout
A 2,000 sq ft house in a cold climate (design 0 F, balance point estimated at 22 F) receives a cold-climate variable-speed heat pump rated 36,000 Btu/h at 47 F and about 22,000 Btu/h at 5 F, with a rated coefficient of performance of 1.8 at 5 F. The existing 15 kW electric resistance strip heat is retained as backup.
563 words, about 3 min3Superheat Reading That Doesn't Match the Charge
A technician services a 3-ton R-410A residential split system on a 90 F day. The unit has a fixed-orifice (piston) metering device.
547 words, about 3 min4Commissioning a New Ductless Mini-Split in a Bedroom Addition
A contractor installs a single-zone ductless mini-split (12,000 Btu/h) in a 300 sq ft bedroom addition. The line set is 25 ft of 1/4 in.
549 words, about 3 min5Customer Dispute Over a System That 'Never Worked'
A homeowner calls six months after a heat pump installation, claiming the system 'never worked right' and demanding a full refund. The installing company's records show a commissioning report with measured airflow of 1,050 cfm, a temperature split of 18 F, and a recorded outdoor temperature of 88 F at start-up.
513 words, about 3 min