1. What is a Garage Heater Size Calculator?

Definition: This calculator estimates the required heater size (in BTU/h) for a garage based on its area, heating requirements per square foot, and adjustment factors.

Purpose: It helps homeowners and contractors determine the appropriate heating capacity needed to maintain comfortable temperatures in garage spaces.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Required heater size (BTU/h)
• \( A \) — Garage area (square feet)
• \( BTU/ft² \) — Heating 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 heater sizing ensures energy efficiency, proper heating performance, and prevents equipment from overworking or underperforming.

4. Using the Calculator

Tips: Enter the garage area in square feet, heating requirement (default 30 BTU/h·ft²), and adjustment factor (default 1.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU/ft² value for garages?
A: Most garages require 20-30 BTU/h per square foot, depending on insulation and climate.

Q2: When should I adjust the factor (F_g)?
A: Increase to 1.5 for poor insulation, 2.0 for very cold climates, or decrease to 0.7 for well-insulated spaces.

Q3: Does this account for garage door insulation?
A: No, you may need to increase the factor if you have uninsulated garage doors.

Q4: How do I convert BTU/h to watts?
A: 1 BTU/h ≈ 0.293 watts. Divide BTU/h by 3.412 to get watts.

Q5: Should I round up the heater size?
A: Yes, it's recommended to round up to the nearest standard heater size available.