Coffee Joulies, Set of 5
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- Coffee is HOT; Joulies are cool; Take the edge off your coffee so it is safe to sip sooner and stays in the perfect temperature range longer
- Polished 18/10 stainless steel shell - just like high end silverware
- Food-based and completely nontoxic phase change material sealed inside absorbs and releases heat from your coffee
- Keeps your coffee at 140°F (60°C) - the perfect drinking temperature
- Made in USA from 85% recycled stainless steel using hydro power from Niagara Falls
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As seen in The New York Times, WIRED, Gizmodo, ABC News, Popular Science and more. Is your coffee is too hot? Use Joulies to cool it down and keep it perfect. Tired of burning your tongue on coffee only to have it get cold a few minutes later? With Coffee Joulies your coffee will be ready to drink faster and will stay hot longer. This works thanks to a special material sealed inside the polished stainless steel shell called a "phase change material" that is able to absorb a large amount of energy as it melts at a specific temperature. We use a PCM that melts at 140 degrees Fahrenheit, which we have found to be the perfect temperature for drinking any hot beverage including coffee, tea and hot chocolate. This material is food-based and completely nontoxic. Each Coffee Joulie works with 4 ounces of hot beverage, so toss one in your espresso, two in your double-short vanilla latte, three in your tall drip, four in your vacuum thermos and five in your venti or xl coffee right when it's poured. The material sealed inside the Joulie will begin to melt, absorbing energy from your coffee and cooling it down to the right temperature, 140 degrees Fahrenheit, three times faster. When your coffee reaches this temperature the process reverses. The phase change material begins solidifying, releasing the energy it stored earlier back into your coffee, keeping it hot twice as long. When used in a high-quality vacuum thermos, Coffee Joulies can keep your coffee in the right temperature range for over five hours. Coffee Joulies set includes set of 5 Coffee Joulies (made in the USA), Joulies logo carrying pouch, instruction card.
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In short, they
- make your coffee cooler slightly faster (1.5x in my testing versus 35x advertised)
- have negligible difference on drinkable range (1.06 in my testing versus 1.9x advertised)
- look very shiny and seem well made
- have reasonable customer service and accept returns, the reason for the second star
I have uploaded my test data in the product images for anyone interested. These match well with another reviewer's data from marco.org.
DO NOT fall for these, they are purely a gadget designed to play to human emotion, but make little to no difference on actual coffee temperature. Go buy a thermos if you want your coffee to stay warm longer, it will make a much larger difference. These are likely somewhat more effective in thermoses, but they are not useful in conditions that matter when drinks cool faster. The full story is below if you are interested.
The first time I used them, I put them directly in the piping hot Dunkin Donuts cappuccino, which I often burn my mouth on. I read the advertisement that says in an insulated thermos, a 180 degree drink was safe to sip in 2 minutes 25 seconds, so I waited 5 minutes. I took a small sip and burned my tongue, not a good start. I figured maybe since they took longer to cool, it would stay hot longer. By the time I got to my desk (~40 minutes), it was already cold. Usually, it is still luke warm. I figured the cappuccino at around 180 degrees wasn't enough to melt all the PCM, so I made tea using boiling water. Still no noticeable effects.
I decided to see with data if I was just imagining this, or if they really were making little to no difference. I took their test data from their website, and scaled it to fit in my mug rather than their insulated thermos. Using my calibrated thermocouple, I took data from a control test and the mug with the scaled amount of Joulies. The drink was safe to sip slightly sooner, but the drinkable range was almost identical (1.06x longer using the Joulies). That is only a 15 second difference! I decided maybe I have defective units and emailed customer service.
The response I received was "It seems like you have been using the joulies properly. For some people it achieves the desired effect and for others it doesn't. Sorry that you were not happy with your Coffee Joulies." They have not even attempted to disagree, or backup their product. They are well aware of the non-effectiveness in real world situations. I will be sending them back for a refund, but I am still out shipping.
These do not keep the coffee warm. If anything it made it cold and contrary to what the instructions said, it did not warm back up.
Most recent customer reviews
They do cool my coffee down to an acceptable temperature slightly faster than letting the cup sit for a few minutes.Read more