10.8.3 download the Boot Camp 5.x drivers and install those.
Macs tend to run hotter in Windows. That has always been true though some systems do better and with more recent drivers from Apple.
I have dozen 'tips' on various issues in the past for Windows 8 and MacBook Air and others. Now some of those were addressed with new drivers and even new firmware.
MacBook Air and MacBook Pro Update 1.0 (76.64 MB)
This update fixes an issue that can lead to increased CPU power consumption, and it improves compatibility with some USB devices.
Products Affected:
MacBook Air (11-inch/13-inch, Mid 2012), MacBook Pro (13-inch, 15-inch, Mid 2012), MacBook Pro (Retina, Mid 2012)
Additional Information:
This update is recommended for all Mac notebooks introduced since June, 2012."
*******
To get your fans to work on your Macbook Pro.
Shut down you computer. After it is shut down press Command+Option+Control+Shift and then press the power button. Nothing should happen - your screen should remain blank.
The computer should Not start to boot up at this point. After you have done this. Release the 4 buttons and press the power button once again.
Use the Option Key to get back into your bootcamp Partition of Windows 7.
The fans should now properly spin up when your computer starts to get hot.
Startup Key combination: here is the old list:
http://support.apple.com/kb/HT1343
Startup Key combinations new list
I personally searched for hours for this same solution then finally resorted to calling apple. It was a very simple thing to do for something so important as cooling. The key combination resets your hardware settings in your bios for the fans. My fans now correctly function.
*****
MacBook Air 2012
Core i7 upgrade
You get a choice of three different CPUs. The Core i5-3317U comes standard in the 11, the i5-3427U comes with the 13, and both systems can be upgraded to the Core i7-3667U.
There is a known bug with the upgraded CPU under Windows. Turbo Boost is disabled under Windows on the 3667U, although it's fully functional under OS X. Apple is aware of the problem and I'd expect a fix at some point, but there's no indication of when.
http://www.anandtech.com/show/6063/macbook-air-13inch-mid-2012-review/2
*****
Sometimes all the Boot Camp drivers were not getting installed properly and had to go back and individually run some of the drivers.
This may or may not be possible as it seems to be Apple has changed the installer package... so take with grain of salt.
Also an issue with administrative accounts.
http://www.pcmag.com/article2/0,2817,2393005,00.asp
Trouble just downloading drivers. Burning ISO. Using external USB-DVD or flash installer drive.
* a bug with Boot Camp control panel and administrative rights.
when trying to launch the "Boot Camp Control Panel", but I just stumpled upon a solution.
I created a new Windows user, that was not Administrator. When I logged in Boot Camp updateded something and asked me to restart the computer.
After restarting and logging in with my new user, I could start the "Boot Camp Control Panel" configure tap to click and use F1-F12 as function keys.
Then I changed the new account to Administrator and now the control panel can not be startet again... but my settings remained... only on the new user only though.