I've looked high and low, and I can't seem to find any examples of this on a small scale, home use type of setup. Industrial applications of solar powered absorption cooling have been around for years. Does anyone have any experience, or know of anyone who has tried to scale it down? My very general idea would be to place an evacuated tube in a parabolic trough, with the collector end heating the area that would normally be heated by the propane flame. Then at night, switch to a bio-gas flame if it is a refrigerator, or just let it sit with nothing happening if it is a freezer and gets cold enough during the day to maintain freezing temps over night. I'm not an engineer, just a hobbyist, so be gentle. Lol