MacBook 2014 i5 with Yosemite running extremely hot

Question

I have a MacBook Air 2014 i5 4GB RAM which I upgraded to Yosemite from Mavericks. It runs so hot. I wish to downgrade it and gone back to Mavericks if the problems not able to solve. I just do a clean install Yosemite by using USB drive.
EtreCheck
Problem description:
Yosemite running extremely hot Macbook Air 2014
EtreCheck version: 2.1.8 (121)
Report generated March 20, 2015 at 5:26:42 PM GMT+8
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Hardware Information: ℹ️
    MacBook Air (13-inch, Early 2014) (Technical Specifications)
    MacBook Air - model: MacBookAir6,2
    1 1.4 GHz Intel Core i5 CPU: 2-core
    4 GB RAM Not upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless:  en0: 802.11 a/b/g/n/ac
    Battery Health: Normal - Cycle count 8
Video Information: ℹ️
    Intel HD Graphics 5000
        Color LCD 1440 x 900
System Software: ℹ️
    OS X 10.10.2 (14C1514) - Time since boot: 0:10:1
Disk Information: ℹ️
    APPLE SSD SD0128F disk0 : (121.33 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 120.47 GB (109.03 GB free)
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
USB Information: ℹ️
    Apple Internal Memory Card Reader
    Seagate BUP Slim RD 2 TB
        SBPD (disk1s1) /Volumes/SBPD : 2.00 TB (774.41 GB free)
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Razer Razer Copperhead Laser Mouse
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Launch Daemons: ℹ️
    [failed]    com.bombich.ccchelper.plist [Click for support] [Click for details]
User Login Items: ℹ️
    Macs Fan Control    Application  (/Applications/Macs Fan Control.app)
Internet Plug-ins: ℹ️
    Default Browser: Version: 600 - SDK 10.10
    QuickTime Plugin: Version: 7.7.3
3rd Party Preference Panes: ℹ️
    None
Time Machine: ℹ️
    Mobile backups: OFF
    Auto backup: NO - Auto backup turned off
    Volumes being backed up:
        Macintosh HD: Disk size: 120.47 GB Disk used: 11.45 GB
    Destinations:
        SBPD [Local]
        Total size: 0 B
        Total number of backups: 0
        Oldest backup: -
        Last backup: -
        Size of backup disk: Too small
            Backup size 0 B (Disk used 11.45 GB X 3)
Top Processes by CPU: ℹ️
         6%    WindowServer
         1%    fontd
         1%    sysmond
         1%    launchd
         0%    AppleSpell
Top Processes by Memory: ℹ️
    73 MB    Finder
    73 MB    ocspd
    64 MB    mds_stores
    56 MB    Safari
    52 MB    WindowServer
Virtual Memory Information: ℹ️
    2.05 GB    Free RAM
    1.35 GB    Active RAM
    386 MB    Inactive RAM
    514 MB    Wired RAM
    740 MB    Page-ins
    0 B    Page-outs
Diagnostics Information: ℹ️
    Mar 20, 2015, 05:16:26 PM    Self test - passed
    Mar 20, 2015, 02:51:45 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/cloudd_2015-03-20-145145_[reda cted].crash
    Mar 20, 2015, 08:59:49 AM    /Library/Logs/DiagnosticReports/mbpluginhost_2015-03-20-085949_[redacted].crash

Answer 1

    Macs Fan Control    Application  (/Applications/Macs Fan Control.app)
Never use those things. The only thing you will accomplish by forcing the exhaust fan to operate at a higher speed than required will be to draw in more environmental contaminants than it would otherwise. Interfering with the Mac's cooling system could conceivably invalidate its warranty.
Power or other problems related to unexpected system sleep, shutdown, lights or fans call for an SMC reset. Read all the steps.
Before Resetting the SMC
Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.
Press Command + Option + Escape to force quit any application that is not responding.
Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
Restart your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
Shut down your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.
Resetting the SMC on portables with a battery you should not remove on your own
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if it's not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time. The power adapter indicator light may cycle off / on once.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.