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HVAC BTU Sizing Calculator — 免费在线计算器 | HomeCalcPro
HVAC BTU Sizing Calculator精准计算，提供行业标准公式与即时测算结果。
Project & Material Dimensions
Estimated Material & Energy Output
HVAC Thermal Load Sizing Formula
Transparent mathematical methodology explained in plain English.
Cooling BTU = Area (sq ft) × Base BTU (20) × (Ceiling Height / 8) ± Climate/Sun Adjustments | Tonnage = BTU / 12,000Applies Manual J residential load calculation standards: base 20 BTU/sq ft adjusted for ceiling volume, wall insulation, solar heat gain, and local climate zone.
Variables Explained:
- Room Area (sq ft): Total floor area to be heated or cooled.
- Ceiling Height (ft): Vertical ceiling height (default 8 ft).
- Insulation & Climate: Insulation quality (poor/average/good) and climate zone.
1,500 sq ft House in a Moderate Climate with Standard 8 ft Ceilings
Calculating cooling BTUs, AC tonnage, and heating capacity.
- Base Cooling Load: 1,500 sq ft × 20 BTU/sq ft = 30,000 BTU/hr.
- AC Tonnage (12,000 BTU = 1 Ton): 30,000 / 12,000 = 2.5 Tons.
- Heating Capacity (1.1x in moderate zone): 30,000 × 1.1 = 33,000 BTU heating.
常见问题解答 (FAQ): HVAC BTU Sizing Calculator
Click any question below to expand quick answers, formulas, and expert tips.
Why is an oversized air conditioner bad for a house?
An oversized AC cools the air too quickly without running long enough to remove indoor humidity, leading to cold, clammy rooms, mold risk, and short-cycling compressor wear.
How many square feet does 1 ton of AC cool?
As a general rule of thumb, 1 ton of air conditioning (12,000 BTU) cools approximately 500 to 650 square feet in a modern, well-insulated home.