Laundry your clothes in COLD water. Most of the time cold water and liquid soap will clean the clothes fine. You save on heating the hot water.
Hang clothes to dry. You can do this inside on coat hangers from the shower rod for small wearables. Use a dryer rack for undies and such. Line dry sheets, etc. outside. Drying clothes inside the house during the winter will generate moisture in the air which makes a lower-set heat more comfortable and also is better for your breathing.
Use fans to circulate air during the hot weather. You can tolerate a higher set thermostat for your air conditioning if the air is moving. Floor fans, and ceiling fans work for this.
Avoid eating much sugar during hot weather. Your body converts the sugar into fuel which your body goes into gear to burn. So you start getting warmer.
During the winter, cook moisture generating soups, etc. to heat the house. Bake to heat the house.
During the summer, cook large batches that need long cooking.This way you are cooking ahead. Rewarm quickly in microwave. The pre-cooked meals are convenient and one-cooking time uses the heat for several meals. During hot weather, the one-cooking time method heats up your kitchen only once saving on your AC and also saving on the fuel to cook. Microwaves are great for no-heat cooking.
Cook up a large batch of boiled chicken. Portion it out to..... Make chicken salad. Freeze meal portions of cooked chicken for other uses - salads, tacos, casseroles, quick-stir frys.