Been doing this with my water heater for years. Makes a big difference. Adding to this, limit the amount used DURING a shower. I wet down, turn water off, lather, then water on & rinse. (RV camping taught me this) My water heater, used this way, keeps enough hot for 2-3 days without flipping switch back on so long as I don't run dishwasher, lot of hot water for something else, etc. Next two BIG users of power -- clothes dryer & electric stove -- on day to day basis, that is. Of course, heat is always a concern IF electric.
So, clothesline, inside racks. Solar oven. Or cook in batches to freeze in smaller portions & reheat. As said, cook & use oven heat to warm house for that time of use. Cook far less in summer, limited AC use. I open windows when cool at night & close in day to keep cool inside -- shades on South windows (plus they are multi-pane, gas filled, e glazed, etc).
My whole house heat system is electric heat pump. I have a propane heater (looks like wood unit it replaced) which heats entire downstairs very nicely, far less expense. Upstairs I close off in winter as unused. It's always above freezing up there but cool for daily use. Rare use.
I don't get extreme or uncomfortable but use methods such as these to reduce use of utilities when possible.