1. What is a Garage Unit Heater Sizing Calculator?

Definition: This calculator estimates the required heating capacity (in BTU/h) for a garage unit heater based on the space volume and desired temperature increase.

Purpose: It helps homeowners and contractors properly size heating equipment for garages and other similar spaces.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Heater capacity (BTU/h)
• \( \text{Volume} \) — Space volume (cubic feet)
• \( \Delta T \) — Desired temperature increase (°F)
• \( 0.133 \) — Standard conversion factor for air heating

Explanation: The formula calculates the heat energy needed to raise the temperature of the air volume by the specified temperature difference.

3. Importance of Proper Heater Sizing

Details: Correct sizing ensures efficient operation, prevents energy waste from oversized units, and avoids inadequate heating from undersized units.

4. Using the Calculator

Tips: Measure your garage's length, width, and height to calculate volume. Determine ΔT as the difference between desired temperature and coldest expected outdoor temperature.

5. Frequently Asked Questions (FAQ)

Q1: How do I calculate garage volume?
A: Multiply length × width × height in feet. For example, a 20'×20'×8' garage is 3,200 ft³.

Q2: What's a typical ΔT for garage heating?
A: For heating to 60°F when it's 20°F outside, ΔT would be 40°F.

Q3: Does this account for insulation?
A: This is a basic calculation. Poor insulation may require 20-30% more capacity, while excellent insulation may need less.

Q4: What about garage door openings?
A: Frequent door openings may require additional capacity. Consider adding 10-20% for garages with regular traffic.

Q5: Can this be used for other spaces?
A: Yes, it works for any space with similar air exchange rates, though specialized spaces may need adjustments.