newbie insulating question

[SkyWalker]

i am beginning to setup my AG 3 tier gravity beer rig and was planning on using 10gallon rubbermaid coolers... i just recently found some kegs already cut and plumbed for home brewing used for nearly the same price as new coolers

my question is... which is going to insulate my heat better in my mash tun? will it be hard to keep a steady heat in the keg/cooler? (im assuming the cooler would work best)... i am in southern california so i dont get any really cold or really hot weather, but i dont want to worry about keeping a steady heat in my MLT..

also, is it worth trying to do 10 gallon batches (when i get that far) in the coolers? or should i just buy all the kegs now since i have the opportunity? i am just worried about doing 5 gallon batches in 15 gallon kegs

any input would be highly appreciated!!

 

[azscoob]

I do 5 gallon batches in my keggle all the time, no worries there! as for the mash tun, I use a cooler that is big enough to do 10 gallon batches in, my cooler will drop 1° over a 90 min mash, and .5° to 1° on an average 60 min mash, I have thought of going to a direct fired mash tun/keggle but I have very good results from the cooler so I think I will continue to use it for a while longer.