Not only is the Slipstream Energy Star Certified, but it produces a high CFM rating of 8,778. Your ceiling fan’s efficiency is measured by dividing the CFMs by the total watts your fan uses. We can go with either rates or quantities when we look at energy efficiency of ceiling fans. Rather than the usual blunt blades or mock palm leaf blades, it had blades which tapered along the length. However, style, ceiling height, and many other factors play into the ceiling fan decision along with efficiency. Most of the fans were in the 60 to 75 cfm/watt range. The range of ceiling fan efficiencies that I saw in the store ran from 35 cfm/watt on the low end to 106 cfm/watt at the high end. Energy usage can be a bit confusing because of the whole rate versus cumulative quantity issue. By contrast, central air conditioners gobble 2,000 to 5,000 watts, while room air conditioners consume 600 to 3,000 watts. Thanks Allison. Fans differ from other appliances in that their operating efficiency varies significantly based on how they are applied and where within their operating envelope they are selected. Martin Holladay wrote a great article about ceiling fans (I'm adding a link to it in the Related Articles list above.) The most energy efficient ceiling fans use less than 60 watts on average and have high airflow. ), M. Johnson: Yes, the Gossamer Wind fans are sold in the big box stores. The current required test procedure (shown left) shows a ceiling fan hanging above a 3 foot tall metal cylinder that is 8 inches wider than the ceiling fan (blade span) and stands 4 feet above the floor. It looks great but I saw online that their MSRP is around $500! Using the longest downrod that keeps the blades at least 7' above the living space (for safety reasons) will maximize CFM. Or for financial investments, past performance is no guarantee of future results. © 2020, Energy Vanguard | 533 West Howard Avenue, Suite E, Decatur, GA 30030, Using Ceiling Fans To Keep Cool Without AC, How to Make a High-MERV DIY Portable Air Cleaner, How to Make a Good High-MERV Filter Even Better, 10 Consequences of Keeping Your Home Really Cold in Summer, Ten Years of Building Science Summer Camp, My Duct Systems on Low-Static Mini-Split Air Handlers. Every new ceiling fan being sold in the US these days … A few of the boxes had more energy data than the simple box shown above. Sensors are located at the bottom of the cylinder to measure the wind speed. Ceiling fans with remotes give you complete control over the ceiling fan blades and lights from afar. I wonder if anyone has seen numbers published, measuring what percentage of household electric use, is consumed by ceiling fans. Of course, as you state, once the fans get installed in someone's home, there's no guarantee they'll perform at the stated efficiencies. They cool people. There is no remote with this unit, but instead, you can operate it using the pull-down chains. a couple of years ago, and the comments have more info about the Gossamer series. The higher the number, the more air is moving. As they say for cars, your mileage may vary. Jeffrey: Great points! You may not have found them because they're sold under the name Windward. To qualify for Energy Star certification, a fan must produce at least 155 CFM, 100 CFM and 75 CFM of airflow per watt on the high, medium and low speeds respectively. Do you remember a few years ago when Florida Solar Energy Center reported on a high efficiency ceiling fan? A fan with 36-inch blades uses approximately 55 watts. Ten years ago when I was building a house and buying a bunch of ceiling fans, it wasn't so easy to figure out which fans were energy efficient and which weren't. Here it is: That's right. Ceiling fan efficiency can be represented simply as Efficiency = CFM/Watt. The labels on the boxes I looked at all showed a box with three numbers, all specified for the fan running at high speed: the air flow (cfm), the rate of electricity use (watts), and the air flow efficiency (cfm/watt). If you look carefully at the two labels above, you'll see one other thing there that I saw on nearly every label: a money saving tip. Log in. The Cost of Ceiling Fans vs. Air Conditioning: What’s the Difference? A CFM of 75 is the minimum number to make a fan efficient. Sponsored. But in a place like Houston when poor people have trouble with AC bills, the official stance of the electric company is they should use fans in place of AC. Chris K.: Yeah, Big Ass Fans aren't cheap. CFM/watt could be a tie breaker for some people. The product works … Many fans, while not providing as strong a breeze, still circulate the air efficiently—and look fantastic while doing it. I've seen many installations where the short 8" rod is used and I could almost guarantee that the fan is not achieving optimal performance. $300. Five factors work together to determine the airflow and efficiency of a ceiling fan: blade pitch, blade shape and size, RPM, height from ceiling, and motor size. A fan with 48-inch blades typically consumes 75 watts, while a 52-inch-blade fan uses 90 watts. If you need more ceiling fan accessories, check out our ceiling fan light kits, ceiling fan light covers and our ceiling fan … Ceiling fans are a great way to keep cool in the summer and warm in the winter if you know how to use them properly. You can see this in the label shown above. This bit of information is telling you what the expected range of efficiency should be … I too fail to see the logic of spending $500 for a high CFM per watt fan. One of the best ways to save money is to save on utility costs, especially heating expenses. Both will move about the same amount of air (neither will move much) while the 52" consumes more power. ENERGY STAR® ceiling fans That one was about what a waste of energy it is to leave fans running when no one's in the room. By and large a ceiling fan will do two things: increase the flow of air in a given direction, and, largely as a result of the first, de-stratify the air in a room. Smart Ceiling Fan. I don't know what the testing requirements are but I'm sure they include proper installation. Since the CFM is the measure for a fan’s airflow efficiency, the number of blades is more related to embellishing the style for your space. They represent the year’s very best for energy savings and environmental protection. 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