Wow - here they are, trying to save you some energy, and you start shouting. Sheesh.
The Jetsetter is one of two models which do not have removable side panels. But if your dealer is careful, the repair should be quick, clean and not noticeable after the fact.
I have one customer up in the mountains who has heat loss during the icy weather. He goes out and hits the 'Clean' button anywhere from ten minutes to a half-hour before getting in. It warms up the jet pump, and moves any cold water out of any part of the spa. The heater then bring it all back to temp, and by time he opens the lid, he can run the jets longer without noticing temp drop. Keep in mind that the air being injected into the jets is warmed by the jet pump, so try opening things up so more air comes in -
Give it a try.
8-)