❄️ ac size calculator — advanced cooling load estimator
Professional BTU & tonnage recommendation | dynamic graph & real‑time results
+600 BTU each after 1st
(for reference & efficiency context)
📊 Recommended AC capacity
0 BTU/h
0 Tons (US standard)
⚙️ Model year: —
📈 Real‑time load graph
⬆️ Current cooling demand (BTU/h)
🔍 Factor influence (USA & global standards)
Adjust any input → instant analysis
Adjust any input → instant analysis
📘 How to use this tool
- Enter room area & ceiling height (choose ft or m).
- Select sun exposure, insulation quality and climate region.
- Add number of occupants and kitchen appliances if present.
- Optional model year helps identify modern efficiency references.
- ✅ Results update automatically — BTU and tonnage change live.
- Graph shows the required cooling load; check extra insights below.
💡 Expert tips for perfect sizing
- ✔️ Right-size avoids short cycling: Oversized AC wastes energy & humidity control.
- ✔️ Insulation matters most: Upgrading from poor to good can reduce required BTU by 20%.
- ✔️ Climate zone key: In hot-humid (USA South / India) multiply base load x1.3.
- ✔️ Year 2024+ units: Higher SEER2 means better efficiency, but BTU sizing remains same.
- ✔️ Ceiling >9ft: add extra ~10% for volume effect (our formula auto-adjusts).
🌎 Factor reference (USA & worldwide standards)
📐 Area: 20 BTU per sq ft baseline (global rule). 1 sq m = 10.764 sq ft → converted.
☀️ Sun: High adds +20% load, low reduces (USA Energy Star).
🧱 Insulation: Poor +30% / Excellent -15% (DOE recommendations).
🌡️ Climate: Very Hot multiplier 1.35; Cool 0.85 (ASHRAE climate zones).
👥 Occupants: Each person +600 BTU/h (sensible & latent heat).