"Listen," she said, "I have to come to the office in the subway, with this horrible heat and humidity killing me. That's why I wear shorts. But then, when I come to the office we get this summertime sub-zero air conditioning, blowing at full, and I freeze! That's why I got the Slanket."

She is so right. She may not look as pretty as without the Slanket, but it's actually freezing here. This is the irony of spending summer in NY or any other city in the world: You go through your day suffering artificial winter in t-shirt and shorts, only to be toasted a minute later as you go down to grab a sandwich.

So as I write these lines and feel the hypothermia coming in, the frostbite on my feet—only protected with Havaianas—I wish I had a Slanket too. Definitely the ultimate accessory for summer in the city.

Developed with the University of Tokyo, Nissan says that their new Forest AC air conditioning system "is designed to recreate the refreshing climate, fragrance and natural breezes of relaxing forest settings." How? Let's review:

• The system's Breezy Air feature actually creates a "natural breeze" effect by randomly changing the air volume through all vent outlets, according to external sunlight and external temperature. The system can change the air pattern in the breeze depending on which side of the car you are seated, increasing volume if you are seating on the sunny part or decreasing it if you are on the shade.

• The aroma control system is even more curious: The University of Tokyo's research team studied the effects of fragrances, air flow, and humidity in mental activity, concluding that two aromas can "alleviate boredom and stimulate the driver's brain": Borneol and leaf alcohol. According to Nissan, Borneol "combines a compound made from fragrant Kapur wood, lavender and other essential oils to promote calm and focus, while leaf alcohol is found in most plants and is thought to have a calming effect and reduce fatigue."

• Everything is combined with humidity control—which in theory keeps the car interior in perfect conditions—automatic outside and inside odor control—that will prove useful more than one time, I'm sure—and a plasmacluster ion generator... which may a) disintegrate you, b) teleport you to another place, c) "maintain cabin air quality, kill germs through strengthened bacteria deactivation and minimize odors clinging to the cabin air and interior surfaces," or d) all of the above.

I like option D, although right now I just want option B. [Autoblog via Ubergizmo]

But why?

Simple: It's the environment, stupid. And ironically, in a country obsessed with technology and where "business casual" is rarely allowed, it's a low-tech, remove-your-tie solution to the energy consumption problem that's ultimately to blame for Gross's, well, gross and sweaty Japanese experience.

You see, in 2005, Environment Minister Yuriko Koike, a woman who had once had perspiration aspirations for the prime minister position, was vetting various ways to cut energy consumption. Her brainstorming led to "Cool Biz," a campaign that set all government building thermostats to 82.4 degrees during the summer. I'm sweating just typing that out this morning, but apparently it worked, and soon the business world adopted the practice too.

But since those temps are somewhat unbearable in the summer, Japanese energy scientists set to work on alleviating workers' pain. Their big solution? Suggesting they remove their ties and undo their shirt collars. Fun fact: People feel 4 or so degrees cooler when they do this.

The result is a Japan that consumes less energy at the expense of some ripe-smelling arm pits. Now, if you'll excuse me, I need to go adjust my air conditioner. [Slate]

Fans

At the very least a regular fan, a twin window fan that takes advantage of cool night air, room to room fan, or even a bed fan could help save a little extra money—especially if the outside temperature cools sufficiently in your area.

If you have the option of installing a ceiling fan, it can be one of the simplest and most inexpensive ways to reduce energy costs in the home. The average price is around $100 per fan, they can be easily self-installed (as long as you have an existing ceiling light) and they can save you as much as 40% on your energy bills this summer. Take this example from Progress Energy:

...a 48", 75-watt fan used 10 hours a day at half speed or less would cost $.50 to $.90 a month to operate. For a 1,500-square-foot house with air conditioning using two ceiling fans and raising the thermostat setting could save about $70 to $200 over a six-month cooling season.

This is precisely why I just ordered four new fans for my home. Three of the four will be installed upstairs in each of the bedrooms. There will be absolutely no need for A/C at night, and I expect to dramatically lower central air usage on the upper level during the day.

Window A/C Units: Who Should Have One?

The bottom line is that window units use far less electricity than central air units. For example, a typical, medium-sized window unit might use 500 to 1440 watts of electricity per hour while a 2.5 ton central system might use 3500 watts over the same span. Because central air units cool an entire home, users often waste energy in areas that are not occupied. For example, if you live in a small apartment, a 12,000 BTU window unit could effectively cool a 640 square foot space for an upfront cost of around $300. This Fridgidaire model is also Energy Star certified, meaning that it should provide at least an additional 10% savings in monthly energy costs—making it a wise investment when compared to a traditional model. In an apartment around 800 square feet, that would most likely cover the main living space and could be supplemented with something as small as a 5,000 BTU unit for a bedroom. Hell, you might even be able to get away with only a fan—after all, bedrooms see most of their use after the sun has gone down.

Things to consider when buying a window A/C unit:

• Bigger is not better. Too many on/off cycles will reduce efficiency and add result in unnecessary wear and tear. Make sure your A/C unit is sized properly for your room by matching capacity with square footage.
• Make sure your unit has at least three speeds (low, medium and high).
• Buy a model with a thermostat to fine tune your comfort level and save electicity.
• Clean your filters regularly.
• Choose a model with a timer. This gives you even greater flexibility and ensures that the unit is only running when needed.
• Consider building a unit directly into your wall to eliminate the hassle of moving it every year. You can also put an insulated / weather-stripped cover on through-the-wall units in the fall. [HVACKey]

So, to answer the question "who should have one?," I would suggest that people living in small apartments or homes seriously consider investing in a window A/C unit or two. Even if you have central air, keeping it off in favor of à la carte cooling is going to save you some money. For those that have larger dwellings, individual A/C units might come in handy in a bedroom at night, or in rooms that you spend most of your time in.

Getting the Most Out Of Central Air

If you own a home or an upscale rental, you probably already have a central air unit. But simply tweaking the temperature dial now and then doesn't mean you are getting all of the potential cost savings out of your system.

• Get a programmable thermostat. Those old-timey, temperature-only thermostats are a huge waste of money. Simply being able to program your thermostat to kick on when you get home, or run on 78 degrees instead of 72 degrees overnight can result in savings of around $180 per year for an average home. Also, keep in mind that each degree you set your thermostat below 78 degrees will increase your energy use by 3-4%. Plus, basic programmable thermostats can cost less than $30.
• If installing or replacing a unit, keep in mind that the higher the Seasonal Energy Efficiency Ratio (SEER) rating of your unit, the more energy efficient it will be. All Energy Star certified units must have a SEER rating of 13 or higher.
• Units with a thermal expansion valve and a high-temperature rating Energy Efficiency Ratio (EER) greater than 11.6 will be more efficient when the weather is at its hottest.
• Units with a fan-only switch allow for nighttime ventilation to substantially reduce air-conditioning costs.
• Make sure to check filters every month. [Energy Savers]

You may also want to look into a simple misting unit like the Cool-n-Save. It attaches to your central air unit in minutes and can reduce your energy bills by as much as 30%. Plus, the whole system only sets you back $100. On the downside, it does use a significant amount of water, and it may result in a mineral buildup.

Check For Leaks

The most important step in keeping your home cool is making sure that the structure itself isn't working against you. Obviously, if your house or apartment is leaky or poorly insulated, a lot of cash is going to fly out those holes along with the cold air. Furthermore, If you have a central air system, an average of 20% of the air moving through the duct system is lost because of leaks, holes and poor connections. Even if you can't afford insulation upgrades or a blower test to detect leaks, a few DIY tests and some cheap fixes like weatherstripping could save you hundreds if not thousands of dollars in the long term.

Alternatives

They aren't feasible in every situation, but there are a few cost-effective ways to cool a home that break from the norm. These methods include evaporative coolers (swamp coolers), attic fans, and geothermal systems. However, for most of us, just putting up some shades, adding a ceiling fan or two and/or a window A/C unit or programmable thermostat could result in substantially lower utility bills during the hot summer months. And, if all else fails, there is always air conditioned shirts and ice saunas.

Prof. Dealzmodo is a regular section dedicated to helping budget-minded consumers learn how to shop smarter and get the best deals on their favorite gadgets. If you have any topics you would like to see covered, send your idea to tips@gizmodo.com, with "Professor Dealzmodo" in the subject line. [Background Image via Wikimedia]

First off, let's talk a little about clothing. Naturally, wearing the proper attire can make a huge difference on a hot day. Light colored clothing, shorts and flip flops are one way to do it—but if you are looking for something a little more advanced, I have a few examples here you should keep in mind:

USB "Air Conditioned" Shirt: Plugging this shirt into the USB drive of your computer will pull in cool air to your body using fans positioned on the lower part of the back. Available for $169. [Product Page and Link]

Nike PreCool Vest: This vest takes things a few steps further than the air-conditioned shirt when it comes to keeping your core temperature down. The innermost layer of the vest is filled with frozen water and it is insulated by an outermost layer of aluminum. Unfortunately, the vest is only available to Olympic athletes, so it looks like you will have to do one of two things to get your hands on one—undergo a complete physical transformation into a world class athlete, or be patient and hope that Nike releases it to the general public one day. [Link]

Insulated Evaporative Cooling Hat: Solar powered hats with fans are a dime a dozen, but if you really want to stay cool, this cap should do the trick. Just run it under a faucet and let the sun draw heat away from your head by slowly evaporating the water. Apparently, it can keep your head up to 30% cooler than the outside temperature—and a waterproof lining ensures that your head stays dry. And as anyone who has ever watched a survival show knows, you could always urinate on something like this if the going ever got rough. Available for $24.95. [Hammacher Schlemmer]

Sometimes basic air-conditioning just isn't enough to stay comfortable in the heat. When indoors, these gadgets will keep you extra cool (or downright frigid):

Ice Sauna: If you have the means, the latest trend in many European countries is to install an ice sauna in your home. This particular sauna, dubbed the "Snow Room," was developed by a company called MNK—and it can keep the temperature at a brisk 10 degrees below zero. But I must warn you—if you manage to lure a chick this hot into one of these things, keep in mind that penis frostbite will bring a party down real fast. [Link]

"Air Conditioned" Bed: If ice saunas are a little too extreme for your taste, you could always cool down at night with an "air-conditioned" bed. Using similar technology as the shirt mentioned earlier, this device will draw air in into the pad and circulate it under your body while you sleep. Available for $399. [Product Page via Link]

Luxury 18-headed shower: A cold shower is not just for sexual frustration—it can be a great way to escape the heat as well. This monster luxury shower is an 18-headed beast that will all but drown you in water. Plus it has a powerful floor nozzle that looks as though it will give you a cold water enema. Now that is refreshing! Too bad it will cost you $100,000 to install. [Tag Signature via Link]

When outdoors, a swimming pool is an ideal way to beat the heat. But not everyone is fortunate enough to have one at their disposal. Here are some alternatives:

Big Wave Trampoline: Pools are great, but what if I am looking for something a little deadlier? This 13-foot Big Wave Trampoline will keep you cool and give you that adrenaline rush you so desperately crave. Available for $11.95. [Super Fun Trampolines]

Universal Shower Diffuser: Staying hydrated is extremely important when it is hot outside, but sometimes you just feel like pouring that bottle over your head to cool off. This gadget fits on any standard PET bottle and restricts the flow of water so that it can be dispensed like a shower head. That means you can enjoy a quick soak and still have some water left over for drinking. Unfortunately, the dude in this image has the wrong idea. Available for around $50. [Made in Design via Link]

Finally, what you put on the inside is just as important as what you put on the outside when it comes to staying cool. And when I think of a hot day, two things generally come to mind: booze and ice cream.

Taisin Ice Sphere Mold: Perfect on-the-rocks-drinks require perfect ice—and this mold from a Japanese company named Taisin can help you achieve that feat by creating perfect ice spheres. When a chunk of ice is placed inside the press, the mold gradually closes around it as it melts. The result is a sphere that melts slowly in your drink—ensuring that it does not get watered down. The Taisin mold can produce 30-40 ice balls in an hour and it is available in 55, 65, 70 and 80mm sizes. [Taisin via Link]

The Scoop & Stack: By the looks of things, the Scoop & Stack can make quick work of getting ice cream out of a container. And the cylindrical shape means you can stack that sucker to the sky. Available for $14.95. [Wrapables]

Old Tie.New tie.Old tie.New tie.

Repeat ad infinitum (rather like Thanko's R&D department does with its products.) [Akihabara News]

It can sit on a desk and blow cool or hot air at a person, at 90% more efficiency than a space heater. It's all done by electrics, and the unit has a high quality filter built in.

I can't see this being very powerful or effective for cooling a full human, but you know when your pants get really sticky and hot and sweaty in the Summertime? Yea.

c2 [Herman Miller via i4u]

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Well, this Desktop Air Conditioner looks to be a solution, if kind of a half-assed one. It's tiny, and the fact that it doesn't connect to the outside air makes me question how much conditioning it's actually doing (it uses ice water, natch). But hey, for $24 maybe it'll at least keep you from ruining your favorite shirt with sweat stains. –Adam Frucci

Product Page [via Ubergizmo]

Sounds like a great way to store coolness at the lowest cost, and the company says the system will pay for itself in savings over three years. The greenies like it too, because it doesn't use any environmentally unfriendly gases such as freon. Everybody wins. – Charlie White

Honda Cools Off with Ice [treehugger]

The shirt is also powered by four AA batteries in case you don't have a USB slot anywhere nearby. It even plugs into the cigarette lighter in your car—because it's such a great idea hooking up your body to your car's electrical system. – Jason Chen

USB Powered Air conditioned clothes [New Launches]