You make a good point about the metal cover but since it is glued on and the fan cost $50 I was reluctant to try and rip it off from the start. I think the cover conducts some of the heat from the heatsink so its hard to tell if its much worse. I could feel the fan pushing more air compared to the older one but its not too significant. I made some rough temperature measurements using NHC with estimated times but take it with a grain of salt. Idle at startup: 39-40 degrees Heavy usage for 15 minutes - Firefox with 3 tabs, Adobe Digital Edition book reader, OneNote, Media player classic running Wall-E 720p trailer in repeat: 50-55 degrees Turned off everything except firefox for 10 minute web browsing: 49 degrees. Idle after 10 minutes: 46 degrees. During heavy usage the cpu was around 50% on average so it was not at its hottest point. I have the 1.06ghz cpu and I still struggled trying to get cpu to 100% usage. My usage of the computer is probably not as demanding as most people.