Oven:
Stop sneaking a peak! Every time you do so, 25 percent of the heat escapes. Cook
in glass or ceramic pans when possible, they allow you to set your oven
temperature 25 degrees lower than called for by the recipe. Scrub that oven
yourself! Self-cleaning ovens use tons of energy to super heat and burn off
residue. Scrubbing is free! Cook several items in the oven at the same time if
possible. Preheat your oven as little as possible. Most foods don't require it. For
foods that require immediate heat, such as cakes, pies and soufflés, preheat for
10 minutes only. Turn off the oven about 15 to 20 minutes before the end of
cooking time. The leftover heat in the oven will finish the job if you don't open
the oven door. (Source)
**Guys, you may hate us or love us for this tip! Use the grill as much as possible! This saves energy!