1. What is the Average kWh Calculator for Central AC?

Definition: This calculator estimates the energy consumption (in kilowatt-hours) of a central air conditioning system based on its capacity, efficiency rating, and runtime.

Purpose: It helps homeowners and HVAC professionals estimate electricity usage and costs for cooling systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E_{kWh} \) — Energy consumption (kilowatt-hours)
• \( Tons \) — Cooling capacity of the AC unit (tons)
• \( SEER \) — Seasonal Energy Efficiency Ratio
• \( t \) — Runtime (hours)
• \( 3.517 \) — Conversion factor from tons to kW

Explanation: The formula converts tons to kW, multiplies by runtime, then divides by efficiency to get total kWh consumed.

3. Importance of Energy Consumption Calculation

Details: Understanding AC energy use helps with electricity cost estimation, system sizing, and efficiency comparisons between different units.

4. Using the Calculator

Tips: Enter the AC capacity in tons (typically 1-5 for residential systems), SEER rating (new units range from 13-25), and runtime in hours. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical SEER rating?
A: Older units may have SEER 8-12, while modern units range from 13-25. Higher SEER means better efficiency.

Q2: How do I find my AC's tonnage?
A: Check the model number (often contains the tonnage) or nameplate. 1 ton = 12,000 BTU/hr.

Q3: What's considered normal runtime per day?
A: In summer, AC may run 8-12 hours/day depending on climate, insulation, and thermostat settings.

Q4: How can I reduce my AC's energy consumption?
A: Increase SEER rating, improve insulation, use programmable thermostats, and maintain the system properly.

Q5: What's the average kWh range for central AC?
A: Typically 0.48–5.14 kWh per hour of operation, depending on system size and efficiency.