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Central Air Conditioning Watts
Asked Aug 30, 2007, 03:54 PM
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9 Answers How many watts are in a typical 3 ton central A/C unit, 5 ton unit and 10 unit? Does Anyone know? I'm trying to figure out how much of my electricity bill is due to air conditioning and heating cost. |
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| You can estimate based on the data sheets. An example: 2-1/2 Ton 208/230 Volt 1-Phase Scroll Compressor Direct Factory Replacement Part (Copeland): American HVAC Parts Is a 2.5 ton compressor at 2.5 HP You can assume a 1/3 HP outside blower and a 1/2 HP inside blower. 2.5 + 1/3 + 1/2 =3.33 HP Add about 25 W for controls Running watts would be about 746*3.33 + 25 that 2486.8 W Call it 2.5KW; there are 746 W/HP At $0.15/KWH it's about 2.5 KW * $0.15/KWH = $0.375/hr to operate If it runs 5 hours per day 5 * 0.375 * 30 = $31.75/month Hopefully, my math is right. Running time could be off. Each month could be different because it depends on the cooling degree-days Once you find a fudge-factor for degree-days, you might be able to get a seasonal cost. USATODAY.com Look at the nameplate for similar information. | ||||
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| One ton of refrigeration will equal approximately 3517 watts, so a 3 ton unit will draw 10551 watts. This is the load that is used to size service entrance calculations. Assume the unit runs 5 out of 24 hours a day for one month: 150 hours x 10551 watts = 1582650/1000 = 1583 KWH @ $0.15/KWH = $237.45 per month. Plug in your cost of a kilowatt-hour and the hours per day the unit runs and go from there. Should be close. | ||||
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| A central air conditioner is more than just the largest appliance in a home—it’s part of a carefully designed system that also incorporates a thermostat and an array of ducts that deliver and circulate cooled air throughout the structure. In most cases, a central air-conditioning system is a more energy-efficient choice for regularly cooling a home than using room air conditioners in three or four different rooms. However, there’s no getting around the fact that a central air conditioner can be fairly expensive to purchase—and that it must be installed by a qualified heating and cooling contractor. If your home doesn’t have central air-conditioning—but does have a network of ducts for a forced-air furnace—you likely can use the same ducts for cooling, as long as they’re the proper size and free of leaks and obstructions. On the other hand, if your home is heated by a boiler or electric baseboard units, you’ll need to add a duct system, which can be both difficult and expensive—especially in a multi-level home, where you might have to sacrifice closet space or build “chases” along walls or in corners to hold the ducts. For more information, click here, air conditioning | ||||
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| Most of the answers here and elsewhere are between totally to partially wrong. Do not mix horse power with cooling power. A 5 ton a/c is the nominal capacity of a unit. At 12,000 BTU per ton, a 5 ton will have close to 60,000 Btu (most of the time is 10% less) At an Seer of 10 (1980 models) it will be 60,000/10=6.0Kw. Add the fan at about 0.675 and an old unit will take about 6.675 KW. That's why we need the newer ones with SEER of 16 or higher. 60,000/16=3.750 kw+.675 fan=4.425 kw. However in both examples the inside blower was not added to the total. That inside Blower could vary between 1.0 to 1.7 kw, depending on the RPM and CFM LW | ||||
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| Continuation to the above post by LW Today was a very, very hot day in Miami, 97 degrees. Went outside to check if the dual stage compressor works as such. I was surprised to see that on the newest Trane we just installed, the Amper-meter started with 14.5 Amps ans slowly climbed up to 18.5 Amps, this was compressor plus fan. So if we take 57,500 Btu/16.0=3.593 kw (that's without the inside Blower). Add inside Blower at 1.5Kw brings the total to about 5.093 kw. At about 12 hours per day X 30 days X $0.12/hr=$220/month LW | ||||
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