If heat is energy, then why does cooling take energy when it should actually give energy? Since everything around us isn't absolute zero temperature, and it has heat/energy, then we should be able to use that energy (without temp' difference I mean) and by using that energy (for example converting it to electricity) cooling the area from which we took the heat from. So is there a way to convert heat without temp difference? Thanks in advance :)
 A: No.  Look up something called the Carnot efficiency, among many others.
There is no extractable heat energy without a temperature difference.
For your apparent level of physics, it's probably best to take this as a fundamental principle that just is.
A: 
Heat is not an intrinsic property; that is, we cannot say that a
  system "contains" a certain amount of heat. Heat is not the state
  function , instead we can say that a certain amount of energy can be
  transferred, into or out of the system in form of heat or work

-Resnick, Halliday, Krane

Another way of looking at temperature is as an indicator of weather two bodies kept in contact will exchange energy as heat

-Resnick, Halliday, Krane
now from these two statement of a book are enough to give you your answer
A: But cooling does release heat.   
If you heat a chunk of iron to 200 Fahrenheit and place it in a closed insulated room as the iron cools it will heat the room.
You could say something contains a certain amount of heat as in the heat required to take it from absolute zero to its current state (including temperature).  But that does not mean much as the only way to extract that heat would be with a heat sink at a temperature of absolute zero and in real life that is not available.
No you don't get to just use the heat.  According to the second law of thermodynamics heat only flows from hot to cold.
If you want to convert heat to work a lower temperature heat sink is as important as the higher temperature heat source.
A: I ask myself this question from time to time, and I don't know if answering now is necroing or what but I'd thought I give my 2c, since the same way I found this question others could.
In my mind cooling something is achieved by putting it in contact with something that is cooler than right? So if u put a block of ice in water it will cool down water and water will heat up the ice until it reaches a balance.
However to keep something cold you need to:
Keep it in contact with something so this temperature balance is achieve at the temperature you want the object to be,
Keep the object (and the environment it is in) isolated from the temperatures outside.
My guess is that the easiest way to do it is to pump cool air into a box, let it cool the object, then pump the warm air out so more cold air come in. Fridges I know use a gas to cool air I think? Just pass it through a cold tube and then into the fridge, while the air insider that would be warmer is taken into the cooling system again(probably? Just intuition at work here)
So the cooling of the air is not consuming electricity and does not require the fridge to be connected to an electrical outlet, but all the air movement via fans and stuff is what consumes energy. 
Maybe we could figure out to use the heat that we're taking from food and stuff in a fridge, to convert it back to energy to move the system itself, and that would make fridges more efficient? Or maybe the amount of heat we take doesn't compare to the amount we spend moving air constantly so it wouldn't matter.
Another thought I've had on the matter, let's say someone on the ISS needs to freeze something, he could go outside and take it out in the hatch to the vacuum outside and freeze it instantly right? It wouldn't require any energy to cool it because it's energy fleeing the object into the vacuum, the only energy used then would be the one the guy uses to take the object out, walking, floating, hatch opening, etc.
