


Manual J Required: Why Rule-of-Thumb HVAC Sizing No Longer Cuts It
Manual J Required: Why “Rule-of-Thumb” Sizing Is Yesterday’s News Picture a blazing July afternoon in Rockford, Illinois. Maya Garcia is on her third glass of iced tea, yet the upstairs nursery still feels like a sauna. Her brand-new 3-ton air-conditioner keeps...
Accurate Washington Manual D Load Calculations From Seattle to Spokane
Accurate Washington Manual D Load Calculations From Seattle to Spokane How precision duct design turns “coast‑to‑canyon” climates into year‑round comfort, one room at a time. A tale of two attics On a drizzly January morning, homeowner Lisa in West Seattle...