Question 1

How do I compare the running cost of two appliances?

Accepted Answer

Formula: Annual Cost = (Wattage ÷ 1,000) × Hours Used Per Day × 365 × Electricity Rate ($/kWh). Example: A 2,000W space heater used 4 hrs/day at $0.14/kWh costs (2 × 4 × 365 × 0.14) = $408.80/year. Compare this to a 200W heat pump using the same hours: $40.88/year — a $368 annual difference.

Question 2

What is the average electricity rate (kWh price) in the US?

Accepted Answer

As of 2024, the US average residential electricity rate is approximately $0.16/kWh, but this varies significantly by state. Hawaii is highest at ~$0.40/kWh. Idaho and Utah are lowest at ~$0.09–0.10/kWh. Always use your actual rate from your utility bill for precise calculations.

Question 3

How do I find the wattage of my appliances?

Accepted Answer

Check the label on the appliance itself (usually on the back or bottom), or look up the model number online. Appliances with heating elements (ovens, dryers, water heaters) typically use 1,000–5,000W. Small electronics (phone charger, LED bulb) use 5–15W. Energy Star certified appliances publish rated power consumption online.

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