1. What is a Commercial HVAC Sizing Calculator?

Definition: This calculator estimates the required HVAC system size in tons based on square footage and load factor.

Purpose: It helps HVAC professionals and building managers determine the appropriate cooling capacity for commercial spaces.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Size — HVAC capacity in tons (1 ton = 12,000 BTU/h)
• Sq Ft — Total area of the commercial space
• Load Factor — Cooling load per square foot (BTU/h per sq ft)

Explanation: The formula converts the total cooling load from BTU/h to tons of refrigeration capacity.

3. Importance of Proper HVAC Sizing

Details: Correct sizing ensures energy efficiency, proper humidity control, equipment longevity, and occupant comfort.

4. Using the Calculator

Tips: Enter the square footage and load factor (default 25 BTU/h sq ft for typical commercial spaces). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical load factor for offices?
A: Office spaces typically use 20-30 BTU/h per sq ft depending on occupancy and equipment.

Q2: How does building orientation affect sizing?
A: South-facing spaces may need higher load factors (5-10% more) due to increased solar gain.

Q3: When would I use a higher load factor?
A: Use higher values (30-40 BTU/h sq ft) for spaces with high occupancy, kitchens, or server rooms.

Q4: Does this include ventilation requirements?
A: No, this is just for cooling load. Ventilation requirements should be calculated separately.

Q5: Should I round up the calculated size?
A: HVAC systems typically come in standard sizes (5, 7.5, 10 tons, etc.), so round up to the nearest available size.