Quick Summary: What You’ll Learn

• 🔌 Simple formulas to calculate AC electricity use
• 🌟 How star ratings affect your power bill
• 💡 Actionable tips to reduce consumption by 30%
• 📊 Real-world examples with cost calculations
• ❓ Answers to most common AC power questions

1. Understanding Your AC’s Power Needs (Key Concepts)

A. What Does “1 Ton” AC Mean?

• Definition: 1 Ton = 3.5 kW cooling power = Cools ~100-120 sq. ft.
• Common Sizes:
• 0.75 Ton (small rooms)
• 1.5 Ton (medium bedrooms)
• 2 Ton (large halls)

B. EER vs ISEER: The Efficiency Metrics

Pro Tip: Higher number = More savings

2. The Power Calculation Formula (With Examples)

Basic Formula

Power (W) = Cooling Capacity (W) / [EER/ISEER]

Step-by-Step Example: 1.5 Ton AC

1. Convert tons → 1.5 × 3,500W = 5,250W
2. Find EER (assume 3-star: 3.1)
3. Calculate: 5,250 ÷ 3.1 = 1,694W (1.69 kW)

Quick Reference Chart

How to Calculate Power Consumption for 1 Ton AC

Formula:

Power (W) = Cooling Capacity (3,500W) / EER or ISEER

Examples:

1. 3-star Non-Inverter (EER 3.1):
   3,500 / 3.1 = 1,129W (1.13 kW)
2. 5-star Inverter (ISEER 4.3):
   3,500 / 4.3 = 814W (0.81 kW)

Quick Estimate:

• 3-star: ~1.1 kW/hour
• 5-star: ~0.8 kW/hour

How to Calculate Power Consumption for 1.5 Ton AC

Formula:

Power (W) = Cooling Capacity (5,250W) / EER or ISEER

Examples:

1. 3-star Non-Inverter (EER 3.0):
   5,250 / 3.0 = 1,750W (1.75 kW)
2. 5-star Inverter (ISEER 4.2):
   5,250 / 4.2 = 1,250W (1.25 kW)

Quick Estimate:

• 3-star: ~1.7 kW/hour
• 5-star: ~1.2 kW/hour

How to Calculate Power Consumption for 2 Ton AC

Formula:

Power (W) = Cooling Capacity (7,000W) / EER or ISEER

Examples:

1. 3-star Non-Inverter (EER 2.9):
   7,000 / 2.9 = 2,414W (2.41 kW)
2. 5-star Inverter (ISEER 4.0):
   7,000 / 4.0 = 1,750W (1.75 kW)

Quick Estimate:

• 3-star: ~2.3 kW/hour
• 5-star: ~1.6 kW/hour

Key Takeaways

• Ton to Watts: Multiply tonnage by 3,500 (e.g., 1.5 Ton = 5,250W)
• EER/ISEER Matters: Higher star rating = Lower power use
• Quick Estimates: Use the wattage values from the chart for approximations

Need Real-World Cost Estimates?

Daily Cost = Power (kW) × Hours × Electricity Rate

Example: 1.5T 5-star @ 8 hours, $0.10/kWh → 1.2 kW × 8 × 0.10 = $0.96/day.

3. What This Means for Your Electricity Bill

Monthly Cost Calculation

Cost = Power (kW) × {Hours/Day} × 30 × {Rate}

Example Scenario:

• 1.5 Ton 3-star AC
• 6 hours daily @ $0.09/unit (₹7/unit)
• 1.7 kW × 6 × 30 × 0.09=$27.54/month

Potential Savings:

• Switching to 5-star inverter: $8.10/month saved (₹630)
• Adding smart thermostat: Additional $4.13/month savings (15%)

Cost Comparison Table (Monthly)

4. 5 Proven Ways to Reduce AC Power Use

1. Temperature Optimization

• Ideal setting: 24-26°C
• Each degree lower → 6-8% higher consumption

1. Smart Maintenance

• Clean filters monthly (15% savings)
• Annual professional servicing

1. Complementary Cooling

• Use ceiling fans → Allows 2-3°C higher AC setting
• Install thermal curtains

1. Upgrade Wisely

• Inverter vs non-inverter comparison
• Right-sizing your AC

1. Usage Habits

• Pre-cool during off-peak hours
• Avoid frequent on/off cycles

5. Frequently Asked Questions

Q1. How many units will my 1.5-ton AC use in 8 hours?

• 3-star: ~13.6 units
• 5-star inverter: ~9.6 units

Q2. Is it better to leave AC on all day?

• For inverter ACs: Yes, at moderate temperature
• For regular ACs: No, turn off when not needed

Q3. Do voltage stabilizers increase consumption?

• Good quality: No impact
• Old models: May add 3-5% load

Key Takeaways: What to Remember

1. Always check EER/ISEER when buying
2. 1 Ton ≈ 1,000W for quick estimates
3. 5-star inverter ACs save 25-40% over 3-star
4. Maintenance affects bills more than you think