My previous 56 plate is250 had heated and cooled seat, the ISF doesn't. It was quite a nice touch but the Mrs did used to say it made a noise and sounded like being sat on an aeroplane (cabin pressurisation) 😂. The ISF seats are different in their construction, so perhaps the clearance wasn't enough to add the fan/blower, or there are some reliability issues with the fan so they didn't bring it into the ISF. I did think the same thing at first but I don't miss the cooled seats in the ISF. If all else fails, if you drive fast enough in the ISF with the windows open you do get a lovely breeze throughout the whole car, even on a hot day 😉