HVAC Load Calculator May 29, 2026February 21, 2026 by Edward HVAC Load Calculator – JobKitHub ❄️ HVAC Load Calculator Calculate required heating/cooling capacity (Manual J Simplified) This simplified Manual J calculator estimates the BTU/hr heating and cooling load for your home. For precise sizing, consult an HVAC professional who can perform a full Manual J calculation. 🏠 Home Dimensions Total Square Footage Average Ceiling Height (ft) 8 feet 9 feet 10 feet 12+ feet (vaulted) 🌡️ Climate Zone Climate Zone Zone 1 (Hawaii, South Florida) – Very Hot-Humid Zone 2 (South Texas, Gulf Coast) – Hot-Humid Zone 3 (Southeast, California) – Warm-Humid/Dry Zone 4 (Mid-Atlantic, Pacific NW) – Mixed-Humid Zone 5 (Midwest, Northeast) – Cool-Humid Zone 6 (Northern States) – Cold-Humid Zone 7 (Northern Border) – Very Cold Zone 8 (Alaska) – Subarctic 🧱 Insulation Quality Overall Insulation Poor (little/no insulation) Fair (minimal insulation) Average (meets code) Good (above code) Excellent (high performance) Home Age Less than 10 years 10-30 years 30-50 years 50+ years 🪟 Windows Total Window Area (sq ft) Window Type Single Pane Double Pane Low-E Double Pane Triple Pane Primary Window Orientation Mostly North Mostly East Mostly South Mostly West Mixed 🏡 Additional Factors Number of Occupants Sun Exposure Heavy Shade Partial Shade Full Sun Calculate Load Reset
