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Vehicle air conditioning loads are the most significant auxiliary loads present in vehicles today. The AC energy use even
outweighs the energy loss to rolling resistance, aerodynamic drag, or driveline losses for a typical 27mpg (8.7-l/100km)
vehicle, as shown in Figure 1. An air conditioner compressor can add up to 5-6 kW peak power draw on a vehicle’s
engine. This power draw is equivalent to a vehicle driving steady state down the road at 35 mph (56 kph). The fuel
economy of a vehicle drops substantially when the AC compressor load is added to the engine. The effect is larger with
higher fuel economy vehicles.

The fuel economy of a vehicle drops substantially when the AC compressor load is added to the engine. The effect is
larger with higher fuel economy vehicles. For a conventional 1X vehicle(vehicle rated 27.5 mpg) using the AC increases
fuel consumption by 35% (or drops fuel economy by 26%). For the Honda Insight, using the AC increases fuel
consumption 46%.






US EPA also mention air conditioning usage in their gas saving tips (
click to see). They recommand "Use your air
conditioning only when necessary. Roll down the windows or open the air vents to keep your car comfortable on not-so-
hot days."

Study showed that the US uses 7.1 billion gallons (27 billion liters) of gasoline every year for air conditioning vehicles,
equivalent to 6% of domestic petroleum consumption, or 10% of US imported crude oil. (crude oil price still climbing) The
Nationwide average retail price for all types of gasoline as of Monday, June 5, rose 2.4 cents per gallon for the week,
according to the U.S. Energy Information Administration, to $2.937. That’s $ 20.85 billion dollars spending every year for
just cooling down automobile cabins around the nation.

You can save the cost  x-shade back at first year

Take a 1X vehicle (27.5mpg) above as example. Travel 1000 miles without AC will consume 36.4 gallon of gasoline. Turn
AC on will consume 12.7 gallon more ($38 worth). Average American driver run their AC for at least 7-8000 miles around
a year. That’s $300 a year spent on just running AC.
I am not saying you can save all those money if you use a x-shade. Yet Just merely a friction of it is more than your cost
to buy a x-shade (starting $19.49) and stay cool.


You need to stay cool when drive.  How heat affects the body:  

Human bodies dissipate heat by varying the rate and depth of blood circulation, by losing water through the skin and
sweat glands, and-as the last extremity is reached by panting, when blood is heated above 98.6 degrees. The heart
begins to pump more blood, blood vessels dilate to accommodate the increased flow, and the bundles of tiny capillaries
threading through the upper layers of skin are put into operation. The body's blood is circulated closer to the skin's
surface, and excess heat drains off into the cooler atmosphere. At the same time, water diffuses through the skin as
perspiration. The skin handles about 90 percent of the body's heat dissipating function.

Sweating, by itself, does nothing to cool the body, unless the water is removed by evaporation-and high relative humidity
retards evaporation. The evaporation process itself works this way: the heat energy required to evaporate the sweat is
extracted from the body, thereby cooling it. Under conditions of high temperature (above 90 degrees) and high relative
humidity, the body is doing everything it can to maintain 98.6 degrees inside. The heart is pumping a torrent of blood
through dilated circulatory vessels; the sweat glands are pouring liquid-including essential dissolved chemicals, like
sodium and chloride onto the surface of the skin  (
quote from goverment report)

Each year thousands of Americans suffer from heat exhaustion and heat stroke. Our bodies dissipate heat four different
ways. Here is what they are and how each of them work:
  • RADIATION (60 - 65%) Radiation is when the air temp is lower than your skin temperature
  • EVAPORATION (25%)  Evaporation is the release of perspiration thru the sweat glands on the skin surface
  • CONVECTION (10 - 15%) Convection is heat loss to air and to water vapor around your body which must be lower
    than your skin temperature.
  • CONDUCTION (2%) Conduction is the transfer of heat from warmer to cooler objects by direct contact.

When the heat index is above 95 you can no longer loose body heat by radiation, convection or conduction because the
index is above your average skin temperature of 91.4. The only way left to reduce body heat is with evaporation and in a
hot environment it is not enough.  That increases your perspiration rate thereby increasing your dehydration rate and
heart rate.

Here's a few other interesting facts about heat and cooling the human body:
When you start to sweat, the blood in your body rushes to your skin to make it damp, thereby trying to cool you so your
core temperature doesn’t rise. An interesting fact here is that there is only so much blood in your body and it is being
pulled away from your vital organs and muscles (including your brain) while this is happening. As a result, it can
adversely affect your concentration and decision-making abilities. In 1968, a NASA study concluded that when the air
temperature is over 95 degrees, you can make up to 60 mistakes per hour. Think about that for a minute. Think how you
should be driving.    Some hot weather auto care
tips.


You may still need to turn AC on when you use a xshade, but at least you can enjoy the cool now.

People say that it is too much trouble to use a sunshade when park, all they need is to set their AC to maximum for 10
minutes then the cabin will cool down. Yeah, right! I bet those 10 minutes isn't exactly fun, either. If you have to turn AC
on during summer, at least you should enjoy the cool you pay for. Use a xshade to help your AC. It's one time deal and it
will work as long as your vehicle last.   Buy an XSHADE to cool your ride?  



How XSHADE (or dashboard cover) cools?   (see more FAQ here)

A pose opened xshade stop sunlight from getting into vehicle cabin from windshield, it cools a parked vehicle. In addition
to that, even a rest xshade will help to cool.

How can a rested xshade(or dashboard cover) reflect heat while not causing any gaze? How can these be possible when
the cover is in same or darker color than vehicle dashboard top?

Unlike dashboard top’s smooth surface, our fuzzy top reflects light and heat at all random directions. From just one
direction, like from driver’s eyes, there is not enough energy picked up to create an image surpass outside view. That’s
why the fuzzy top will always be several degrees lower than the hard dashboard top at summer.

Even say, both of them are being heat soaked to a higher temperature. The dashboard top can store a lot more heat
energy due to its huge mass. Xshade’s fuzzy top weights only few oz yet it can protect all other layers below and
dashboard top covered by it from sunlight. It can be easily cooled down once you have ventilation goiong since it won’t
store much energy in its small mass.
www.xshade.com

                         XSHADE and Fuel economy

One side effect that I didn’t expect to see with my xshade is: My gas mileage increased. My summer
time gas mileage was averaged about 16-17 mpg and my winter time gas mileage is averaged about
19mpg. If you know how much energy an AC system will take to work and to cool down a big vehicle
like my Honda Pilot (It has heavy duty AC), you won’t be surprised at all. This year into the summer,
up to now, my gas mileage remains above 18mpg and close to 19mpg and that save me a lot on gas
money. The reason maybe my AC now works less duty cycle before it hits targeted temperature than
before. As I always put on xshade when parked. I often came back to a much cooler than expected
cabin. When I drivie, all I need is about one inch creaking open from driver's window and that’s cool
enough already.

There is no magic here, XShade helps to cool down a vehicle in several ways.

  • Super easy to use sunshade:  Encourage you to use sunshade everytime you park, even for a
    short stop.
  • Two layers of fabrics with reflective coating provides better sunlight protection than most
    sunshade
  • Even when rest on dashboard top, its leather top cover cools like a dashboard cover.

Air conditioning can be as much as a 26% hit in Fuel consumption.

Base on a report (click to see report) from National Renewable Energy Laboratory, vehicle air
conditioning loads are the most significant auxiliary loads present in vehicles today. The AC energy
use even outweighs the energy loss to rolling resistance, aerodynamic drag, or driveline losses for a
typical 27mpg (8.7-l/100km) vehicle. An air conditioner compressor can add up to 5-6 kW peak power
draw on a vehicle’s engine. This power draw is equivalent to a vehicle driving steady state down the
road at 35 mph.
Hot Water Joe