Well yeah, if you are running temps of 100 you are probably stressing the plants and causing them to yield less. That said, plenty of people have had great grows with a nice yield with high temps - afterall, it was thought for a long time that higher temps = more resin so people ran super high temps and they ended up just fine.

How much are you getting off your 1000 watt lamp? You should be aiming for a pound per 1000 watter.

Also, d\h will raise the temp in your room about 5+ degrees... have you tried only running it during the night cycle? You shouldnt need it when the lights are on as the r\h should drop as the temp increases (to a certain degree) I run 2600 watts and dont need the d\h while the lights are on.

You might want to consider an a\c unit that goes in the window in the room you are growing in. They cost around 60 bucks, but run up the energy bill, in the end you might save money by getting one though. Keep us updated.