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Do you have external shutters on your windows? These will help prevent the increase in temperature within your home during the day. As others have said, good insulation is the best option.You can get a programmable timer which can be set for different on/off times on Mon - Fri and Sat/Sun with manual override and 1 hour boost.
Have you read the thread, this far, Karsten?Heat loss / gain is proportional to the temperature difference. Once at ambient temperature, the house won't lose or gain any heat. There is a limit to how much the A/C or heater will have to do to get back to a temperature you want, this way. If you run the system constantly, you are using maximum energy all the time. No comparison!
...I would not be surprised to find that some homes can reach inside temps of 60C on 40C days. Does it still make sense to let it get this hot if you want the inside to be 25C during the evening/night time?