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BTU Calculation Formula:
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The BTU (British Thermal Unit) calculation estimates the cooling capacity needed for a garage space. It helps determine the appropriate air conditioning unit size based on the area and specific factors that affect cooling requirements.
The calculator uses the BTU formula:
Where:
Explanation: The factor accounts for various conditions like insulation quality, sun exposure, and climate. Garages typically require higher factors than living spaces due to poor insulation and heat-generating equipment.
Details: Correct BTU calculation ensures efficient cooling, prevents energy waste, extends equipment life, and maintains comfortable temperatures. An undersized unit will struggle to cool, while an oversized unit will short-cycle, reducing efficiency.
Tips: Measure your garage's length and width to calculate area. Choose a higher factor (40-50) for poorly insulated garages, southern exposures, or hot climates. Use a lower factor (30-40) for well-insulated spaces in moderate climates.
Q1: Why do garages need higher BTU factors than living spaces?
A: Garages typically have poorer insulation, more air leaks, and may contain heat-generating equipment, requiring more cooling capacity per square foot.
Q2: Should I adjust for ceiling height?
A: Yes, for ceilings higher than 8 feet, multiply the result by (ceiling height ÷ 8) to account for the additional volume.
Q3: What if my garage has windows or faces south?
A: Increase the factor by 10-20% for significant sun exposure through windows or south-facing walls.
Q4: Does this calculation work for heating too?
A: While BTU is a measure of both heating and cooling, heating requirements may differ due to different heat loss characteristics.
Q5: Should I consider other factors for a workshop garage?
A: Yes, add additional capacity for heat-generating equipment (500-1000 BTU per tool) and for frequently opened doors.