1. What is a Garage Unit Heater Sizing Calculator?

Definition: This calculator determines the appropriate size (in BTU/h) for a garage unit heater based on garage area, heating requirements, and garage-specific factors.

Purpose: It helps homeowners and contractors select properly sized heating equipment to maintain comfortable temperatures in garages.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Required heater capacity (BTU/h)
• \( A \) — Garage floor area (square feet)
• \( \text{BTU/ft}^2 \) — Heating requirement per square foot
• \( F_g \) — Garage factor accounting for insulation and climate

Explanation: The base heating requirement is multiplied by garage area and adjusted for garage-specific conditions.

3. Importance of Proper Heater Sizing

Details: Correct sizing ensures efficient operation, prevents short-cycling, and maintains comfortable temperatures without wasting energy.

4. Using the Calculator

Tips: Enter the garage area in square feet, BTU per square foot (default 30), and garage factor (default 1.4). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical BTU per square foot for garages?
A: Most garages need 20-30 BTU/h per square foot, with 30 being a good starting point for moderately insulated spaces.

Q2: How do I determine the garage factor?
A: Use 1.0 for well-insulated garages, 1.4 for average insulation, and 1.8-2.0 for poorly insulated or very cold climates.

Q3: Should I round up the heater size?
A: Yes, round up to the nearest standard unit size (typically in 10,000 BTU increments).

Q4: Does this account for ceiling height?
A: The calculator assumes standard 8-10 ft ceilings. For higher ceilings, increase the BTU per square foot accordingly.

Q5: What about garage doors?
A: The garage factor accounts for typical door heat loss. For multiple or poorly insulated doors, increase the factor.