You are hereHome » Blogs » ckmapawatt's blog blogHow much Energy does AC consume?For Residents » Save Energy It takes just a little energy to save on energy costs. If you pay attention to the little things, the money you save will add up in a big way. The chart below gives you a good idea of energy costs per electrical appliance, kind of like nutrition fact labels on food. See also our Twelve Easy Ways to Save Energy. 1.5 kWh per hour Baseboard heater (six foot unit) (250 W/foot) Heat Pump heat strips 10 kWh per hour w/fan 10.5 kWh per hour w/fan Heat Pump w/o heat strips (1.8 COP)*** 2.93 kWh per hour 9.77 kWh per hour Window/wall (8kBtu) (120V-12 EER) 0.73 kWh per hour 1.8 kWh per hour Central (3 ton-12 SEER) 3.0 kWh per hour 0.2-0.4 kWh per hour $0.03 - $0.05 per hour 0.03 kWh per hour Less than $0.03 per hour 0.075 kWh per hour 380 - 500 kWh per month $41.00- $55.00 per month

Instantaneous (110 v 29 amp) @1gpm 70'F $41.00 - $55.00 per month Instantaneous (240 v 50 amp) @2.5 gpm 83'F 12 kWh per hour 2.3 kWh per hour 1-1.5 kWh per hour $0.11 - $0.17 per hour 6 kWh per hour cleaning 0.12 kWh per 5 min $0.01 per 5 min 0.12 kWh per brew Coffee maker/brew, warmer on 0.4 kWh per hour Dishwasher: normal cycle (not including hot water) 1 - 2.17 kWh per load $0.11 - $0.24 per load Dishwasher: Energy saver cycle 0.5 kWh per load 0.04 kWh per use 0.75 kWh per hour Waffle iron, 4 servings 0.33 kWh per use Refrigerator (frost-free), 15 cu. Ft. (1996 unit) 150 kWh per month Freezer (manual defrost), 15 cu. Ft. 90 kWh per month Newer Units - Energy Star Refrigerators Energy Star Refrigerator, 14 cu. Ft. 34.5 kWh per month $ 3.80 per month Energy Star Refrigerator (frost-free), 17 cu. Ft. 35 kWh per month $ 3.85 per month

Energy Star Refrigerator (frost-free), 19 cu. Ft. 46 kWh per month $ 5.06 per month Energy Star Refrigerator (Side by Side) 21 cu. Ft. 51 kWh per month $ 5.61 per month Energy Star Refrigerator (frost-free) 24 cu. Ft. 54 kWh per month $ 5.94 per month Energy Star Refrigerator (Side by Side) 25 cu. Ft. 60 kWh per month $ 6.60 per month 0.48 kWh per hour 40" - 49" Plasma 0.016 kWh per hour Less than $0.01 per hour 40" - 49" LCD 0.012 kWh per hour 0.24 kWh per hour 40" - 49" DLP 0.2 kWh per hour 30" - 36" Tube 0.12 kWh per hour 25" - 27" Tube 0.09 kWh per hour 28.8 kWh per month 0.02 kWh per hour 0.15 kWh per hour 0.21 kWh per hour 0.06 - 0.25 kWh per hour $0.01 - $0.03 per hour Desktop Computer on sleep/standby mode 0.001 - 0.006 kWh per hour 0.02 - 0.05 kWh per hour Monitor - 17" CRT 0.08 kWh per hour Monitor - 17" LCD

0.04 kWh per hour Speakers (25 Watts x 2) normal volume 0.05 kWh per hour Incandescent bulb (40 W) Incandescent bulb (60 W) 0.06 kWh per hour Incandescent bulb (75 W) Incandescent bulb (100 W) 0.1 kWh per hour Incandescent bulb (150 W) Compact fluorescent (8 W) equivalent to 25 W incandescent 0.008 kWh per hour Compact fluorescent (11 W) equivalent to 40 W incandescentcost of split ac in chennai 0.01 kWh per hour6 000 btu window ac units Compact fluorescent (15 W) equivalent to 60 W incandescentcar ac compressor repair houston 0.015 kWh per hour Compact fluorescent (20 W) equivalent to 75 W incandescent Compact fluorescent (27 W) equivalent to 100 W incandescent

0.027 kWh per hour Compact fluorescent (38 W) equivalent to 150 W incandescent 0.038 kWh per hour 0.3 kWh per hour Clothes dryer (light load vs. heavy load) 2.5 - 4 kWh per load $0.28 - $0.44 per load Warm Wash, cold rinse 2.3 kWh per load Hot wash, warm rinse 6.3 kWh per load 1.08 kWh per hour 2 - 4 kWh per month $0.22 - $0.44 per month Night light (4w on 12-hours/day) 1.44 kWh per month 0.05 - 1.21kWh per hour $0.01 - $0.13 per hour Sweep pump (3/4 hp) 0.56 kWh per hour Filter pump (1-1/2 hp) 1.12 kWh per hour Filter pump (2 hp) Electric heater (1500 W) Electric heater (5500 W) 5.5 kWh per hour 1 kWh per hour 0.46 kWh per hour Sleep Apnea Machine (CPAP) * Estimated energy use is based on average operation conditions. Individual use may vary. ** Estimated costs based on $0.11 per kWh *** COP = Coefficient of Performance. An electric resistance heater has a COP of 1

GPM - Gallons per minute SEER - Seasonal Energy Efficiency Ratio (efficiency given to central air conditioning) EER - Energy Efficiency Ratio (efficiency given to window/wall air conditioners) Solar and Green Power Most air conditioners have their capacity rated in British thermal units (Btu). A Btu is the amount of heat necessary to raise the temperature of 1 pound (0.45 kilograms) of water one degree Fahrenheit (0.56 degrees Celsius). One Btu equals 1,055 joules. In heating and cooling terms, one ton equals 12,000 Btu. A typical window air conditioner might be rated at 10,000 Btu. For comparison, a typical 2,000-square-foot (185.8 square meters) house might have a 5-ton (60,000-Btu) air conditioning system, implying that you might need perhaps 30 Btu per square foot. These are rough estimates. To size an air conditioner accurately for your specific application, you should contact an HVAC contractor. The energy efficiency rating (EER) of an air conditioner is its Btu rating over its wattage.

As an example, if a 10,000-Btu air conditioner consumes 1,200 watts, its EER is 8.3 (10,000 Btu/1,200 watts). Obviously, you would like the EER to be as high as possible, but normally a higher EER is accompanied by a higher price. Let's say you have a choice between two 10,000-Btu units. One has an EER of 8.3 and consumes 1,200 watts, and the other has an EER of 10 and consumes 1,000 watts. Let's also say that the price difference is $100. To determine the payback period on the more expensive unit, you need to know approximately how many hours per year you will be operating the air conditioner and how much a kilowatt-hour (kWh) costs in your area. Assuming you plan to use the air conditioner six hours a day for four months of the year, at a cost of $0.10/kWh. The difference in energy consumption between the two units is 200 watts. This means that every five hours the less expensive unit will consume one additional kWh (or $0.10) more than the more expensive unit. Let's do the math: With roughly 30 days in a month, you're operating the air conditioner: