What is the consenus as to whthger the water in a jacuzzi/spa needs heating during July?

I have always travled in April/May when to make full use of the pol we have had the hetaing. Now of course it would be daft to heat the pool in July but surely to get the fizz or zipp from a Jacuzzi you wil need to warm it up?

Also what are the pros/cons of a jacuzzi aginst a hot tub..

Cheers