Aluminum vs. Copper

[Richard F Flynn <rflynn@dircon.co.uk>]

I hesitate to ask, but does anyone have and rigorous data on aluminum or copper
is better at dissipating heat?  I have been told by a HVAC type that copper is
usually the metal of choice for cooling systems in buildings because it is more
efficient than aluminum, yet people on the list seem to have had improved their
cooling situations with aluminum radiators.

Any hard data out there?

thanks in advance,

rick