You don't "burn" fat. Losing fat has nothing to do with the temperature in your body.
To keep it simple, you have two main energy stores in your body... carbohydrates and fat. Fat requires more than twice the energy to convert into usable energy by your body as compared to carbohydrates. That's why many athletes would traditionally "carbo load" before a major event... carbohydrates are more easily converted into energy than fat.
You "lose" fat through a combination of diet and exercise that forces your body to tap the fat stored in your body, rather than the available carbohydrates. You do this by using more calories than you consume. That's the basis for many low-carb diets. You can circumvent these low-carb diets by simply eating healthier and adding exercise into your weight-loss regimen.
Fact: Right now, you have roughly the same number of fat cells as you will have through most of the rest of your life. You never "burn" or "lose" fat cells... they just become smaller.
Long story, short... you don't "burn" fat. If:
calories(used) < calories(consumed) === weight loss