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"One ton per 500 square feet" ignores everything that actually matters. Here's why simple calculators get it wrong.
2,000 sq ft
Heating: 85,000 BTU
Cooling: 48,000 BTU (4 ton)
2,000 sq ft
Heating: 35,000 BTU
Cooling: 24,000 BTU (2 ton)
Same size. 2.5x different load. A simple calculator would recommend identical equipment for both.
Real load calculation considers 30+ factors. Here are the big ones.
Window area, type, and direction can swing cooling loads by 30%+. South and west windows add massive solar gains.
Wall R-values, ceiling insulation, and air sealing determine how fast heat escapes. Modern homes need half the capacity.
Air leakage and duct location can account for 30-40% of total load. Leaky ducts in hot attics are equipment killers.
AutoHVAC analyzes all of this from your blueprint—automatically
Get Accurate Load Calculation FreeUpload. Analyze. Download. That's it.
Any blueprint PDF works. Floor plans, elevations, energy specs—our AI handles them all.
AI extracts building specs and runs full Manual J calculations. Heating, cooling, room-by-room.
Download a complete, permit-ready load calculation with equipment recommendations.
Precise BTU/hr heating requirements based on design day temperatures for your climate zone.
Sensible and latent cooling loads with proper dehumidification sizing.
Furnace capacity and AC tonnage recommendations based on calculated loads.
Professional documentation that meets building department requirements.
Stop using rules of thumb. Stop oversizing equipment. Upload your blueprint and get real Manual J load calculations—first one's free.
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