thanks mate for the info. 
yeh i think u are definately correct about the condensation with the pinnys in the garage. the wife finally got sick of all the pinnys in the house and i have 25 on custom storage racks in the dbl garage and no where else to put them.  i still have a heap inside, but alot less than before now that over half have been relegated to the garage etc. 
i didnt want to really put the new spa in there but i am unsure if i can get the spa down the side of the house to the rear undercover patio area. 
i was also a bit worried about the spa motor noise annoying the neighbours on that side of the house cause they have some bedrooms on that side of the house near there as well, so i thought the dbl garage, and it would hide the noise etc, so maybe i will have to wrap the stored machines in plastic, or relocate the spa elsewhere. nothing comes easy.lol   i wil take your advice re the thermostat and the insulation as well, thanks.great tip 4 sure.

soaking in the new toy will be fun for the kids and might mellow me out.lol   thanks again.