Some approximate values are given in the table below regarding to power consumption of the household appliances. The values of power consumption for these appliances might actually be varied from these figures. The consuming power is generally measured in the units of watt-hours. The value of power consumption for any appliance is mostly given on the tags of the appliances. However, it can also be calculated by multiplying the average hours used in a day with the following given values. In this way, value of the power consumption per day in watt-hours can considerably be measured.

Some items for example coffee maker and blender are generally used daily for only the part of an hour. A 600-watt household appliance utilized for 5 minutes per day consumes 50 watt-hour per day. Lower and upper ranges are given for some appliances. Lower limit is considered to be for the technologically developed and more efficient models of appliances. The power consumption for some home appliances is denoted with “NA” which might be due to the non-electric sources.



Appliance
Watts
Appliance
Watts
Appliance
Watts
Central Air Conditioner NA
5,000
Electric blanket
200
Hedge trimmer
450
Electric Clothes Dryer NA
3,400
Shaver
15
Weed eater
500
Oven
3,000
Waterpik
100
1/4” drill
250
Hair Dryer
1,538
Well Pump (1/3-1 HP)
480-1200
1/2” drill
750
Dishwasher
1200-1500
Laptop
60-250
1” drill
1000
Coffee Machine
1,500
Plasma TV
339
9” disc sander
1200
Microwave
1,500
LCD TV
213
3” belt sander
1000
Popcorn Popper
1,400
25” color TV
150
12” chain saw
1100
Toaster oven
1,200
19” color TV
70
14” band saw
1100
Hot Plate
1200
12” black and white TV
20
7-1/4” circular saw
900
Iron
1,100
Stereo
10-30
8-1/4” circular saw
1400
Toaster
1,100
Satellite dish
30
Refrigerator/ Freezer**
Microwave
500-1500
Radiotelephone - Receive
5
20 cu. ft. (AC)
1411 watt-hours/day*
Room Air Conditioner NA
1,100
Radiotelephone - Transmit
40-150
16 cu. ft. (AC)
1200 watt-hours /day*
Vacuum Cleaner
500
LIghts

Freezer
Water heater
479
100 watt incandescent bulb
100
15 cu. ft. (Upright)
1240 watt-hours /day*
Sink Waste Disposal
450
25 watt compact fluor. bulb
28
15 cu. ft. (Chest)
1080 watt-hours /day*
Expresso Machine
360
50 watt DC incandescent
50
Cell Phone - recharge
2-4 watts
Dehumidifier
350
40 watt DC halogen
40
MP3 Player - recharge
.25-.40 watts
Blender
300
20 watt DC compact fluor.
22
* TV’s,VCR’s and other devices left plugged in, but not turned on, still draw power.

**To estimate the number of hours that a refrigerator actually operates at its maximum wattage, divide the total time the refrigerator is plugged in by three. Refrigerators, although turned "on" all the time, actually cycle on and off as needed to maintain interior temperatures.
Humidifier
300-1000
CFL Bulb (60-watt equivalent)
18
Video Game Player
195
CFL Bulb (40-watt equivalent)
11
Standard TV
188
CFL Bulb (75-watt equivalent)
20
Monitor
150
CFL Bulb (100-watt equivalent)
30
Computer
120
Heaters***

Portable Fan
100
Engine Block Heater NA
150-1000
Celing Fan
100
Portable Heater NA
1500
Can Opener
100
Waterbed Heater NA
400
Curling Iron
90
Stock Tank Heater NA
100
Stereo
60
Furnace Blower
300-1000
Cable Box
20
Clothes Dryer - Gas Heated
300-400
Clock Radio
7
Well Pump (1/3-1HP)
480-1200
* The daily energy values listed here are for the most efficient units in their class and the information was obtained from Consumer Guide to Home and the General Electric website.


The energy efficiency of an AC depends on two factors: Cooling capacity (in BTU) and Power consumption (in Watts)

The cooling capacity of one ton AC should be 12000 BTU, 1.5 ton AC 18000 BTU. Some companies rate their air conditioners as 1 ton but actually their cooling capacity is less than 12000 BTU. SO the BEE has brought into force star rating system so that the manufacturers cannot misguide the consumers

What to check befor buying air conditioner

While buying air conditioner check the following on the specifications: Cooling capacity in BTU, power consumed in Watts and star rating if available.
Star rating is based upon the EER of an AC. EER is cooling capacity divided by power consumed. To calculate EER in watts BTU needs to be converted into watts. 12000 BTU is equal to 3517 watts or 1BTU = 0.2937 Watts or one ton = 3517 watts
While it is important to choose an AC with higher star rating, it is equally important not to compromise on the cooling capacity, which is the primary function of an AC.

BEE air conditioner Star Ratings

The star rating parameters EER shall be obtained from following tables depending on the year of manufacturing/import/assembling of an air conditioner

Air conditioner Manufactured / Imported / Assembled From 07 January 2010 to 31 December 2011

Star RatingMinMax
1 Star *2.302.49
2 Star **2.502.69
3 Star ***2.702.89
4 Star ****2.903.09
5 Star *****3.105

Air conditioner Manufactured / Imported / Assembled From 01 January 2012 to 31 December 2013

Star RatingMinMax
1 Star *2.502.69
2 Star **2.702.89
3 Star ***2.903.09
4 Star ****3.103.29
5 Star *****3.30 

Air conditioner Manufactured / Imported / Assembled From From 01 January 2014 to 31 December 2015

Star RatingMinMax
1 Star *2.702.89
2 Star **2.903.09
3 Star ***3.103.29
4 Star ****3.303.49
5 Star *****3.50 


The cooling of a room also depends on other factors other than ton like, insulation, number of windows, sunlight, heat producing appliances in the room like TV, computer etc.


A simple calculation is as follows

Multiply the length, breadth and height of the room (take units as feet). Then divide this by 1000 to get the ton capacity

Example if the room’s size is 10 feet by 10 feet by 10 feet

So 10 X 10 X 10 comes out to 1000, divide this by 1000 the answer comes to 1. So your as tonnage requirement is one ton.

Another example room size 12 feet by 12 feet by 9 feet. The multiplication comes out to be 1290. Dividing this by 1000 leads to 1.2. so tonnage requirement is 1.2 ton. If there is direct sunlight in the room and  /or the air conditioner is exposed to sun, or you stay on the top floor where roof heats up, go for 1.5 tom AC otherwise go for 1 ton AC as air conditioners are available in 0.75 ton. 1 ton and 2 ton and above capacity only

Air condition Ton requirement calculator / Chart for room
S no
Length*
Breadth*
Height*
Total L*B*H
Ton required
1
9
9
9
729
0.75
2
9
9
10
810
0.75
3
10
10
9
900
0.75-1
4
10
10
10
1000
1
5
11
11
9
1089
1
6
11
11
10
1210
1-1.5
7
12
12
9
1296
1-1.5
8
12
12
10
1440
1.5
9
13
13
10
1690
1.5
10
14
14
10
1960
1.5-2
11
15
15
10
2250
2
* In feet, one feet is equal to 12 inches or 30.48 centimeters, 0.32 meters