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Garage Heater Size Formula:
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The Garage Heater Size Calculator determines the appropriate heating capacity (BTU/hour) needed to effectively heat your garage space based on volume, temperature requirements, and garage type.
The calculator uses the garage heating formula:
Where:
Additional Adjustment: For attached garages, add 20% to account for heat loss through shared walls.
Details: Correct heater sizing ensures efficient heating, prevents energy waste, maintains comfortable temperatures, and extends equipment lifespan. Undersized heaters struggle to heat the space, while oversized heaters cycle too frequently.
Tips: Measure garage dimensions accurately (length × width × height), consider your local climate for outdoor temperatures, and select the appropriate garage type. Ensure desired temperature is higher than outdoor temperature.
Q1: Why do attached garages require 20% more heating capacity?
A: Attached garages lose heat through shared walls with the main house, requiring additional capacity to maintain desired temperatures.
Q2: How do I calculate garage volume?
A: Multiply length × width × height in feet. For example: 20ft × 24ft × 8ft = 3,840 ft³.
Q3: What temperature difference should I use?
A: Use your local average winter temperature for outdoor temp and your desired comfortable working temperature (typically 60-70°F).
Q4: Are there other factors that affect heater sizing?
A: Yes, insulation quality, number of windows/doors, and garage usage patterns can affect actual heating requirements.
Q5: Should I round up when selecting a heater?
A: Yes, it's recommended to round up to the nearest standard heater size available for optimal performance.