1. What is Heated Floor Area Calculation?

Definition: This calculator estimates the heat output (in BTUs) required for a heated floor area based on floor size, BTU per square foot, and a correction factor.

Purpose: It helps HVAC professionals and homeowners determine proper heating capacity for radiant floor systems or space heating requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat output (BTU/h)
• \( A \) — Floor area (square feet)
• \( \text{BTU/ft}^2 \) — Heat requirement per square foot
• \( F_f \) — Correction factor for heat loss

Explanation: The floor area is multiplied by the base heating requirement, then adjusted by a factor accounting for insulation, climate, and other variables.

3. Importance of Proper Heat Calculation

Details: Accurate BTU calculation ensures comfortable temperatures, energy efficiency, and proper sizing of heating equipment.

4. Using the Calculator

Tips: Enter the floor area in square feet, BTU per square foot (default 30 BTU/h·ft²), and correction factor (default 1.2). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU per square foot value?
A: For radiant floors, 25-35 BTU/h·ft² is common, but this varies by climate and insulation quality.

Q2: What does the correction factor represent?
A: It accounts for heat loss through walls, windows, and ceilings. Higher factors (1.3-1.5) are for poorly insulated spaces.

Q3: How do I measure my floor area?
A: Multiply length by width of each room, then sum all areas to be heated.

Q4: Does this include domestic hot water needs?
A: No, this calculates only space heating requirements. Add 20-30% for combined systems.

Q5: How does ceiling height affect the calculation?
A: For ceilings over 8 feet, multiply the result by (ceiling height ÷ 8) as a rough adjustment.