Square Footage Formula:
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Definition: This calculator estimates the area that can be heated based on the heating capacity (BTU) and the heating requirement per square foot.
Purpose: It helps HVAC professionals and homeowners determine how much space a heating system can effectively warm.
The calculator uses the formula:
Where:
Explanation: The heating capacity is divided by the heating requirement per square foot to determine the maximum area that can be effectively heated.
Details: Proper heating calculations ensure comfortable temperatures, energy efficiency, and proper sizing of heating equipment.
Tips: Enter the heating system's BTU output and the BTU requirement per square foot (default 30 BTU/h sq ft for moderate climates). All values must be > 0.
Q1: What's a typical BTU per sq ft requirement?
A: In moderate climates, 30-35 BTU/h per sq ft is common. Colder climates may need 40-50 BTU/h per sq ft.
Q2: How do I find my heating system's BTU output?
A: Check the manufacturer's specifications or the rating plate on your furnace or boiler.
Q3: Should I adjust for room height?
A: Yes, for ceilings over 8 feet, increase the BTU requirement by about 10% per additional foot.
Q4: Does this account for insulation quality?
A: No, adjust the BTU per sq ft value based on insulation - use lower values for well-insulated spaces.
Q5: What about windows and exterior walls?
A: Add 10-20% more BTU for rooms with many windows or exterior walls in cold climates.