Running a 250 watt heat lamp for 24 hours costs roughly $0.72 at the U.S. average electricity rate of about $0.12 per kWh, or between $0.60 and $1.20 depending on your local utility rate.
A 250 watt heat lamp draws 0.25 kW per hour, totaling 6 kWh over a full 24-hour cycle. Multiply that figure by your per-kWh rate to get your exact cost — residential rates in the U.S. currently range from around $0.10 (Louisiana) to $0.20 (California and New England), so a 250 watt heat lamp running continuously will land between $0.60 and $1.20 per day in most commercial or residential settings.
- Energy consumption: a 250 watt heat lamp uses 6 kWh over a 24-hour period.
- Cost at U.S. average rate ($0.12/kWh): approximately $0.72 per 24-hour run.
- Cost range across U.S. utility rates ($0.10–$0.20/kWh): $0.60 to $1.20 per day.
- Monthly cost estimate (continuous operation): $18 to $36 depending on local electricity rate.