Example
Input: 400 sq ft, Zone 4
Result: 12,000 BTU (1 Ton)
Step-by-Step Guide
- Area: Room Length x Width.
- Climate: Select Zone (Cool/Moderate/Hot).
- Modifiers: Add for windows, sun, occupants.
- Result: Required Capacity.
What is HVAC BTU Estimator?
Estimates the British Thermal Units (BTU) required based on room square footage, ceiling height, insulation quality, and sun exposure.
👷 Safety First: Always adhere to local building codes and regulations. Wear appropriate Personal Protective Equipment (PPE) when performing construction tasks.
How it Works
1. Base Calc: Area (sq ft) * 20-60 (Climate Factor).
2. Adjustments: +10% for high ceilings, +4000 BTU for kitchens, +10% for sunny rooms.
3. Result is target BTU/hr.
FAQ
What is a 'Ton' of AC?
1 Ton = 12,000 BTUs/hr.
Does ceiling height matter?
Yes, standard charts assume 8ft ceilings. Add 10% for every 2ft increase.
Kitchen load?
Kitchens add significant heat from appliances; add ~4,000 BTU.
Insulation?
Poor insulation can double the required BTU.
Mini-split vs Window?
Same BTU math applies, but mini-splits are more efficient.
Conclusion
Sizing is critical. An undersized unit runs constantly without reaching temp. An oversized unit 'short-cycles', failing to dehumidify the air, leading to clammy comfort and mold risk. Always verify with a Manual J calculation for whole-home systems.