The earliest sunrise of the month in Dublin is 5:41 AM on August 1 and the latest sunrise is 51 minutes later at 6:32 AM on August 31. The latest sunset is 9:20 PM on August 1 and the earliest sunset is 1 hour, 4 minutes earlier at 8:16 PM on August 31.
1.2 kWh x $0.25 = $0.30 per hour to run your window air conditioner. At 8 hours a day for 125 days of summer, your window air conditioner will have an annual running cost of $300 a year.
Truth In Numbers. At the average national electricity cost of 12 cents per kilowatt-hour, a typical window air conditioner running 12 hours per day uses 335 kilowatt-hours per month and costs around $40 monthly to operate. A 2.5-ton common residential central air unit uses around 1,300 kilowatt-hours per month and costs just over $150.