i plan to do some residential construction in the southern african nation of mozambique. (lots of sunshine) i have become quite interested in these hybrid solar ac's that i am seeing. there seem to be two basic types of hybrids, one has tube type collectors and the other a flat style collector. has anyone had a chance to try one out or see one at a home show or something? i only have a vague idea of how they work but it appears the sun heats the gas and takes a big burden off the compressor thereby saving electricity. steve