About FridgeCalc

FridgeCalc provides free HVAC calculations and refrigerant reference data for technicians, contractors, engineers, and homeowners.

Data Sources

• ASHRAE Fundamentals Handbook — thermodynamic properties, duct friction data
• ACCA Manual J (8th Edition) — residential load calculation methodology
• SMACNA HVAC Duct Construction Standards — duct sizing and noise guidelines
• AHRI Standard 210/240 — SEER rating methodology
• EPA eGRID — CO2 emission factors
• Manufacturer data sheets — Chemours, Honeywell, Carrier, Lennox, Trane

Purpose

We built this site because most HVAC reference data exists only in PDF documents, phone apps, or behind paywalls. Our goal is to make these calculations freely accessible on the web, with proper source citations, so technicians can get the data they need quickly.

Not Professional Advice

This site provides estimates and reference data. It does not replace professional engineering judgment, a licensed HVAC contractor's assessment, or official code documents. Always verify with your local authority having jurisdiction (AHJ).