I live in Australia and is fucking hot down here lol.

Still my ps4 fans are loud, and I don't know why. Kinda worried that it might be break anytime. Luckily I kept the receipt, so i can replace it or have it fixed if it does fuck up.

Definitely hang on to that receipt.

I just checked and my PS4 fans aren't loud, at all. I even have it placed between two glass panels and have GTAV running on it for hours.

The size of the console is kinda annoying, I buy all the consoles so it being so big means everything won't fit in my TV stand.  Hopefully a slim version comes along before I have to buy a X1.

So the loud fans aren't normal? I hope it doesn't fuck up :(

Pretty sure Microsoft was just playing it safe. Better safe than sorry.

Also, half the size? Um...

The XB1 is a bit taller as well...

I remember my PS3 fans getting louder during the summer, even my laptop did, so room temperature does effect it. Also, over time dust can accumulate and clog the vents. I'm not sure how hot your room is, or how restricted the ventilation is where your PS4 is currently positioned, but I would be slightly worried if- particularly for a new piece of hardware- the fans were running quite loudly. 

Do other electronic devices ie. laptops consoles etc. run loud for you? If the answer is no, you may have a faulty device, and as I mentioned already hanging on to that recepit is advised.

Designs come down to the people that are hired for the project. Some are just better than others.

Checkout the teardown.  I recommend the one performed by Wired. The PS4 is a slanted heatsink. The whole machine is designed to redirect heat and airflow. The thing is an engineering marvel and it is executed in a very artistic manner (see teardown).  The Xbox One's design fulfill the same airflow requirements but is far less elegant in its execution.  The PS4 has hotter components but the design of the the cooling solution is completely built into the design of the PS4 from the ground up.

I take all my consoles out of the shelf when I use it, so it doesn't overheat when running. My PS3, 360, Wii U, Xbox One, and  laptop don't have unusual sound problems.  The ps4 is a month old, so i suspect it has some minor fault in it. Thanks for your help, fingers cross that it doesn't fuck up!