Welcome to our forum.
He's scratchin' your leg, cappykat. A lot of people have been doing that lately, except for me. I'm a Southern gentleman. Terminator
Sorry Cappykat and ssbraun! Just a sarcastic yankee poking holes in certain sales pitches.
In my mind there are 3 types of spas relative to insulating value: Full Foam, a well insulated thermopane and a poorly insulated thermopane. The first 2 types are good choices, the 3rd is an energy pig. If you inspect the spa closely the 3rd type are pretty obvious.
ST, you forgot about a 4th type and a 5th type. Alot of brands are partial foam, meaning they have foam srpayed on the shell but not all the way out to the cabinet walls. Then theres the brands that have foam sprayed on the shell and a perimeter insulation. Are these type TP or FF, I would say neither.