Take puppy out, and wait up to 5-10 minutes. When you bring him back in- crate him for 5 minutes. Then back out you go. Repeat cycle until he goes. Keep him on a leash while outside, so he knows it's not a play time adventure.

This accomplishes two things: 1. He doesn't get a chance to soil inside on the carpet, 2. You get to cool down before heading back out.