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Air Conditioner Wattage Formula:
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The air conditioner wattage calculation determines the electrical power consumption of an AC unit based on its cooling capacity (BTU) and energy efficiency (SEER rating). This helps estimate running costs and electrical requirements.
The calculator uses the wattage formula:
Where:
Explanation: The formula converts cooling capacity to electrical power consumption by dividing by the efficiency rating. Lower SEER values mean higher power consumption for the same cooling output.
Details: Calculating AC wattage is essential for determining electrical circuit requirements, estimating energy costs, comparing energy efficiency between models, and ensuring proper electrical system capacity.
Tips: Enter BTU rating (typically found on AC unit specifications) and SEER rating (energy efficiency label). Both values must be positive numbers. Common residential AC units range from 5,000-24,000 BTU with SEER ratings from 13-25+.
Q1: What is SEER rating?
A: SEER (Seasonal Energy Efficiency Ratio) measures air conditioner efficiency - higher SEER means more cooling per watt of electricity consumed.
Q2: How do I find my AC's BTU and SEER ratings?
A: Check the manufacturer's label on the outdoor unit or consult the product specifications. BTU is usually clearly marked, while SEER may be listed as "efficiency rating."
Q3: Is this calculation for running watts or starting watts?
A: This calculates running watts. Starting watts (surge power) during compressor startup are typically 2-3 times higher than running watts.
Q4: How accurate is this calculation for energy cost estimation?
A: It provides a good estimate for average conditions. Actual consumption varies based on temperature, humidity, insulation, and usage patterns.
Q5: What's the difference between BTU and tons?
A: 1 ton of cooling = 12,000 BTU/hour. Residential AC units are often rated in tons (1.5 ton, 2 ton, etc.) which can be converted to BTU by multiplying by 12,000.