Have you guys considered using a thermocouple to monitor case and room temperature during graphics card reviews? You've mentioned that you don't have a climate-controlled bunker handy, but at least this way you could monitor the temperature and make sure that the graphics card you review last isn't unfairly penalized (Or the one you review at noon vs the one you review at midnight or such, and could compare temperatures between various TR locations), and you could also show what the effect of running one of these hot graphics cards has on your room. There seem to be a fair number of scientific USB thermocouples available, which would work, and I'm sure someone has made a cheaper model.
"In theory, there is no difference between theory and practice. But, in practice, there is."
- Attributed to Jan L.A. van de Snepscheut