Source hierarchy
We prioritize U.S. government agencies, national laboratories, ENERGY STAR, recognized technical standards, utilities, and manufacturer documentation. Secondary sources may provide context but do not silently override primary data.
Human responsibility
Automation and AI may assist research, drafting, coding, testing, and editing. They do not replace responsibility for published formulas, examples, claims, and source interpretations.
Original value
We do not publish pages merely to target keyword variations. Each live calculator must perform a useful task and explain its specific inputs, assumptions, limitations, examples, and sources.
Corrections
Confirmed errors are corrected promptly and relevant tests are rerun. Sources and default data carry review dates so maintenance is visible.
Commercial independence
Advertising, affiliate, or lead relationships do not control calculator formulas or editorial conclusions.