1. What is the Electric Furnace Size Calculator?

The Electric Furnace Size Calculator determines the appropriate kilowatt (kW) rating for an electric furnace based on the required British Thermal Units (BTU) per hour. Proper sizing ensures efficient heating and optimal performance.

2. How Does the Calculator Work?

The calculator uses the conversion formula:

Where:

• \( kW \) — Kilowatts (electric furnace size)
• \( BTU\ Needed \) — British thermal units per hour required
• \( 3412 \) — Conversion factor (BTU per hour to kW)

Explanation: This formula converts heating requirements from BTU per hour to the equivalent electrical power in kilowatts needed for an electric furnace.

3. Importance of Proper Furnace Sizing

Details: Correct furnace sizing is crucial for energy efficiency, comfort, and system longevity. An oversized furnace cycles too frequently, while an undersized one cannot maintain desired temperatures.

4. Using the Calculator

Tips: Enter the total BTU per hour needed for your space. This value is typically determined through heat load calculations considering room size, insulation, windows, and climate factors.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine the BTU needed for my space?
A: BTU requirements are calculated based on room dimensions, insulation quality, window area, climate zone, and desired temperature differential.

Q2: What is the conversion factor 3412?
A: 3412 BTU per hour equals 1 kilowatt of electrical power, based on the standard energy conversion rate.

Q3: Can I use this for whole-house furnace sizing?
A: Yes, but ensure the BTU input represents the total heating load for the entire living space.

Q4: What are typical electric furnace sizes?
A: Residential electric furnaces typically range from 5 kW to 30 kW, depending on home size and climate conditions.

Q5: Should I consult a professional for final sizing?
A: Yes, professional HVAC technicians should perform detailed Manual J calculations for accurate furnace sizing and installation.