HVAC Load Calculator
Professional heating and cooling load analysis for residential properties
⚠️ This calculator uses simplified load estimation. For critical applications, consult a professional Manual J calculation or HVAC engineer.
Building Information
HDD = Heating Degree Days, CDD = Cooling Degree Days
°F
99% of winter season (usually 1% Design Temp)
°F
1% of summer season (peak conditions)
Indoor Comfort Settings
°F
°F
cu ft
Approximate total cubic feet of conditioned space
Heating Load by Room
Cooling Load by Room
Total Heating Load
0
BTU/h
Total Cooling Load
0
BTU/h
Recommended Equipment Size
0
Tons (Heating + Cooling)
Load Imbalance
Balanced
H/C Ratio
Load Summary by Room
| Room Name | Area (sf) | Heating (BTU/h) | Cooling (BTU/h) | Total |
|---|
System Recommendations
📋 Professional Notes
- Manual J Calculation: This is a simplified estimate. Professional load calculations (Manual J per ACCA) are required for warranty compliance and accurate equipment sizing.
- Safety Factor: Most HVAC designers apply 10–20% safety margin to calculated loads for comfort and peak periods.
- Zoning: If heating and cooling loads are significantly different, consider a zoned system with dampers or variable-output equipment.
- Ductwork: Ensure proper duct sizing and insulation. Poor ductwork can reduce delivery efficiency by 20–40%.
- Maintenance: Clean coils, replace filters, and schedule annual maintenance to maintain rated efficiency.
- Humidity Control: In humid climates, ensure the cooling system can handle latent load (dehumidification).
💡 DID YOU KNOW? ✨
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