Ours is set to 23 ℃ / 74 ℉ during the day and then 20 ℃ / 68 ℉ for sleeping.
The small apartment in Madrid has a 2.3-ton (8 kW) central forced-air system that cools and heats (heat pump). It's variable speed and just coasts along silently on low speed even in the height of summer. The apartment also has underfloor heating, fed by a gas boiler, which is nice but very slow to respond. The forced air heating is much more efficient and cheaper to run compared to the gas underfloor heating. But the underfloor heating is zoned and the A/C is not, so we use the underfloor heating in winter to heat the living area only, as the last thing I want to do is heat the bedroom as I like sleeping in a cold room.
In Palm Springs we have 3 central forced air systems. One in the casita (heat pump) and two in the house (both gas-fired for heating).
The system for the bedrooms is 4 ton (14 kW) and keeps up in summer. The casita keeps up in summer too. The living area system is a 5 ton (18 kW) and only just about keeps up in summer. They are 25 years old and we are managing to keep them going! We'll need to bite the bullet and replace them at some point.
Fortunately, it's very common to have A/C in Spain and of course in Palm Springs, where you couldn't live without it. Newer homes in Spain are built with central A/C and older homes often have central A/C retro fitted (like our apartment, built 125 years ago) or they have mini splits installed. You see more and more mini splits in Palm Springs too, especially in garages and bedrooms, where people just want to cool one bedroom at night. Unfortunately it's still uncommon to see A/C in homes in the UK and Ireland, despite being common in commercial/public buildings. Our apartment building in Dublin was new and yet had no A/C in the apartments, despite all the commercial areas in our multi-use building being air conditioned. We struggled with two noisy and inefficient portable air conditioners. Hopefully this will change as people move away from gas boilers. Perhaps heat pump systems via forced air will become more common as people start to demand cooling as well as heating. You don't need much A/C in the UK and it would therefore be cheap to run and would make a massive difference to sleeping during the summer and general comfort.