DISNEYLAND (air-conditioned shows)
- Tiki Room
- Billy Hill & Hillbillies
- Honey I Shrunk the Audience
DISNEYLAND (rides to escape heat)
- Space Mountain
- Indy (can be a bit stuffy in the queue but it's at least out of the sun)
- Splash Mountain (If you FP this you'll remain mostly indoors and shade)
- Haunted Mansion (queue is outside but ride is A/C)
- Pirates (16-min ride indoors with A/C)
- Star Tours (most of queue is indoors, ride is also)
- Winnie the Pooh (always a short line, ride is indoors)
- Small World (queue is outside but ride is long and indoors)
- Roger Rabbit (FP it and the wait will be short; ride is indoors)
DCA (air-conditioned shows)
- Aladdin (but queue is outside)
- Turtle Talk (show and queue is indoors)
- Muppet Vision 3D
- It's Tough to Be a Bug
DCA (rides to escape heat)
- Soarin' (If you FP it you'll be indoors for the queue and ride)
- Monsters Inc (most of queue is outside but ride is indoors)
- Tower of Terror
Also, the shops are typically very well air conditioned. Disneyland has a lot of large trees and therefore you'll find it much easier to find shade than in DCA.