Chardy, I bought the same air fryer, really like it!
Electric throw is my suggestion for winter, had one years ago when I worked from home in a big drafty house (since moved out of said house to a smaller, warmer place thank heavens - ten years ago my heating DD for a year was £180 a month). Anyway, a heated throw and electric blankets keeps you and your bed warm fairly inexpensively. We only use an electric shower most of the year and don't heat any other water except on an ocassionl basis. I do have concerns though, if you turn the water heating off there is a small risk of things like legionnaires disease, and turning off all the heating means cold but well insulated homes can easily get moldy. I think it's a potential problem these days as we're told to block up drafts but there's too little emphasis on other sorts of ventilation.