User Manual GE Profile PK7500SFSS 27" Built-in Double Wall Oven

To change the oven temperature while baking or broiling, you do not need to turn the oven off first.
While the oven is in use, press Bake or Broil (as appropriate).
Change the temperature using number pads or +/-, depending on model.
Press Start.

If you are raising the temperature, the unit will go into Preheat to reach the new temperature. During Preheat, the upper and lower heating elements are on high to speed preheating. You may need to remove your food until the oven reaches the new temperature.

You can also switch between Bake and Broil in a similar manner. For example, if you are Baking and want to switch to Broil to brown the top of the item you're cooking:
While the Baking temperature is displayed, press Broil Hi/Lo (once for Hi, twice for Lo)
Press Start

The unit does have a fan to cool it. That is why the oven can be large in the relatively compact 27" cabinet. However, the fan is almost silent, and it is designed to broil with the door closed. Of course, the oven fan vent does throw off heat. Any oven will heat up a room. It has nothing to do with a fan. It cannot defy the laws of physics. However the vent is the full width of the oven and at the bottom, so the air movement is soft and quiet; its actually kind of nice on a cold evening... For summer, your HVAC contractor should factor that the room has an oven when designing your cooling.

Thanks for viewing our 27" Wall Ovens! Both ovens feature Self-clean with Steam Clean option.

It also features 2 Self-Clean Heavy Duty Oven Racks, 1 Self-Clean Roller Rack (Upper) and
2 Self-Clean Heavy-Duty Oven Racks (Lower).

Thanks for checking with us