1. What is HVAC Sizing?

HVAC sizing refers to determining the appropriate capacity of heating and cooling systems for a given space. Proper sizing is crucial for efficiency, comfort, and system longevity.

2. How Does the Calculator Work?

The calculator uses the standard HVAC sizing formula:

Where:

• 1 Ton = 12,000 BTU/hour
• Square Footage — Area to be cooled
• BTU per sq ft — Typically 20-30 BTU per sq ft depending on climate and insulation

Explanation: The calculation converts the total cooling requirement (in BTUs) to tons of cooling capacity.

3. Importance of Proper HVAC Sizing

Details: An oversized unit will short cycle, reducing efficiency and lifespan. An undersized unit will run constantly, struggling to maintain temperature.

4. Using the Calculator

Tips: For 1500 sq ft homes, typical sizing is 2.5-3.5 tons. Adjust BTU per sq ft based on climate (higher for hot climates, lower for mild climates).

5. Frequently Asked Questions (FAQ)

Q1: What's the standard BTU per sq ft?
A: Typically 20-30 BTU per sq ft. 25 BTU/sq ft is a common average for moderate climates.

Q2: How many square feet does 1 ton cool?
A: Approximately 400-600 sq ft per ton, depending on climate and insulation.

Q3: What factors affect HVAC sizing?
A: Climate, insulation, window size/direction, ceiling height, and heat-producing appliances.

Q4: Should I round up the tonnage?
A: HVAC systems come in half-ton increments. Round to nearest half-ton unless between sizes, then consider other factors.

Q5: Is this calculation sufficient for exact sizing?
A: For precise sizing, a Manual J calculation by an HVAC professional is recommended.