1. What is a Gas Furnace Sizing Calculator?

Definition: This calculator estimates the appropriate size (in BTU/h) for a gas furnace based on your home's square footage.

Purpose: It helps homeowners and HVAC professionals determine the correct furnace size for efficient heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Size — Furnace capacity in BTU per hour
• Home Sq Ft — Total living area in square feet

Explanation: The formula uses a standard rule of thumb of 40 BTU per square foot for heating in moderate climates.

3. Importance of Proper Furnace Sizing

Details: Correct sizing ensures energy efficiency, proper heating, and prevents premature wear on the furnace.

4. Using the Calculator

Tips: Enter your home's total living area in square feet. The calculator will estimate the required furnace size in BTU/h.

5. Frequently Asked Questions (FAQ)

Q1: Why 40 BTU per square foot?
A: This is a standard estimate for moderate climates. Colder climates may require 50-60 BTU/sq ft.

Q2: What factors can affect furnace size?
A: Climate, insulation quality, ceiling height, window efficiency, and home orientation.

Q3: Should I round up the calculated size?
A: Furnaces come in standard sizes. Choose the next available size if between options.

Q4: Is this calculator for all home types?
A: It works best for single-family homes. Apartments may need adjustments.

Q5: Should I consult a professional?
A: Yes, this calculator provides an estimate. A Manual J calculation by an HVAC professional is recommended for precise sizing.