Size a Garage Heater

Garage Heater Sizing Formula:

\[ Q = A \times BTU/ft² \times F_g \]

Heater Size (Q):

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1. What is a Garage Heater Sizing Calculator?

Definition: This calculator determines the appropriate BTU size for a garage heater based on garage area, BTU requirements per square foot, and adjustment factors.

Purpose: It helps homeowners and contractors select the right size heater for efficient and effective garage heating.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = A \times BTU/ft² \times F_g \]

Where:

\( Q \) — Heater size (BTU/h)
\( A \) — Garage area (square feet)
\( BTU/ft² \) — BTU requirement per square foot
\( F_g \) — Adjustment factor for insulation and climate

Explanation: The base heating requirement is calculated by multiplying area by BTU per square foot, then adjusted for specific conditions.

3. Importance of Proper Heater Sizing

Details: Correct sizing ensures efficient operation, prevents energy waste, and maintains comfortable temperatures without overworking the heater.

4. Using the Calculator

Tips: Enter the garage area in square feet, BTU per square foot (default 30), and adjustment factor (default 1.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the standard BTU/ft² for garages?
A: Typically 30 BTU/ft² for moderate climates, but may range from 20-50 depending on insulation and outdoor temperatures.

Q2: How do I determine the adjustment factor?
A: Use 1.0 for average insulation, 1.2-1.5 for poor insulation or cold climates, 0.7-0.9 for well-insulated spaces.

Q3: What ceiling height does this assume?
A: The calculation assumes standard 8-foot ceilings. For higher ceilings, increase the BTU/ft² value.

Q4: Should I round up the calculated size?
A: Yes, heaters come in standard sizes - choose the next available size above your calculation.

Q5: Does this work for electric heaters?
A: Yes, but electric heaters are typically rated in watts (1 watt ≈ 3.41 BTU/h).