I have several planes now, two 40 size and one 60 size. Can I store these in the garage? I can come up with a way to hang them up just fine, but I am wondering if the heat from the garage will warp the wood in any way during the summer. The garage is not air conditioned and our temps outside get as high as the mid 90's in the summer.

Storing them inside the house is possible but a little difficult. I have plenty of walls in the garage if the heat wouldn't be a problem.

Sure, store them in the garage. My garage here in Texas probably gets hotter than I can say and no problems.

I store mine in the garage in SC and its plenty damn hot down here... I use phone wire (smooth) and loop it rafter to rafter as a sling with the tails up in the empty spaces between rafters.

I store mine in a cargo trailor and beleive me it gets hot in there in the summer. Know problems. That's where they stayed last winter too, and have had know problems this year even after being in cold storage.