This is a little thing, but it helps with cooling in the summer and heating in the winter!
I bake enough sweet potatoes and white potatoes for the weeks meals all at once. In the summer, this means the house only heats up once a week for that. In the winter, after the cooking is done, I open the oven door and let it escape into the house.
I also have a little electric oven that I got at Walmart for $20 a couple of years ago. In the summer, I set it up outside and cook a complete meal in it. Can't do it on a windy day, though.
If you have a vent fan to the outdoors over your stove (or in your bathroom) be sure to turn them off as quickly as you can. They don't just pull odors out of the house, they also pull heat and air-conditioning out.
Sure hope this helps, even a tiny bit.