One man's meat is another man's poison. You don't have to crank up the heat, because light bulbs generate heat? I have to crank up the AC, because light bulbs generate heat.
I prefer tech that most efficiently puts energy to its intended purpose. I don't turn on a light to heat the house, or dial a phone to cook dinner, or use the microwave to wash laundry.
Now you tell me!
What do you do with the heat from your oven?