Elf Sternberg

I've recently heard that there's a couple of other sources of heat that you probably aren't considering:

1. Wireless sources, like proximity to cordless phones, wifi, and microwave ovens.
2. Shiny desk surfaces that actually reflect infrared radiation back into the laptop.

I would suspect 2. before I suspect 1. at your workplace however. 2. is often counter-intuitive for laptops, since hard surfaces usually work better for airflow than soft ones like your lap or sofa.