A 1000-watt space heater costs $0.15 per hour at the US average electricity rate of $0.15/kWh. That is $1.20 per day running 8 hours, $36 per month, and $438 per year. Use this guide to see exact costs for your state and usage pattern.
Formula: 1000W ÷ 1,000 × hours × your $/kWh rate = cost. Here is the breakdown at low, average, and high US electricity rates: