Load & Sizing
Manual J, rules of thumb and oversizing.
Manual J vs. Rule of Thumb: Why '500 Square Feet per Ton' Gets Sizing Wrong
Why square-feet-per-ton sizing misses, what a Manual J load calculation accounts for, and how Manuals S and D fit in.
Oversized AC: The Symptoms, Why It Happens and What to Do
How to recognize an oversized air conditioner, why it hurts humidity control and equipment life, and the options short of replacing it.
AC Short Cycling: Why the Compressor Turns On and Off Too Often
How to diagnose an air conditioner or heat pump that short cycles, using how long it runs and what stops it: thermostat problems, safety switches, low charge, airflow, and oversizing.