1. What is a Garage Heater BTU Calculator?

Definition: This calculator estimates the required heating capacity (in BTU/h) for a garage based on its area, heat loss characteristics, and garage-specific factors.

Purpose: It helps homeowners and contractors properly size garage heaters for efficient and effective heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heating load (BTU per hour)
• \( A \) — Garage floor area (square feet)
• \( BTU/ft² \) — Heat loss per square foot (typically 30 BTU/h·ft²)
• \( F_g \) — Garage factor (typically 1.4 for insulated, 2.0 for uninsulated)

Explanation: The base heat requirement is calculated from area and BTU/ft², then adjusted for garage-specific conditions.

3. Importance of Proper Heater Sizing

Details: Correct BTU calculation ensures comfortable temperatures, energy efficiency, and prevents heater short-cycling or inadequate heating.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the typical BTU/ft² value?
A: Most garages use 30 BTU/h per square foot as a starting point, but this varies by climate.

Q2: How do I determine the garage factor?
A: Use 1.4 for insulated garages, 1.6-2.0 for uninsulated, depending on climate severity.

Q3: What if my garage has high ceilings?
A: Multiply the result by 1.1 for 10-12 ft ceilings, or 1.2 for higher ceilings.

Q4: Should I round up the result?
A: Yes, round up to the nearest heater size available (e.g., 45,000 BTU instead of 43,200).

Q5: Does this account for garage door insulation?
A: No, if you have uninsulated garage doors, consider increasing the garage factor.