Yes. There have been many experiments to recover the coolant.
Firstly you'll never recover 100%.
Next the efficiency comes at a cost, both in money and place (big condenser coils arent quite a beautiful thing in a living room).
There are so many ways, from the simple metallic grill on top of the bong, to condenser coils running along and leading to a separate res, anything goes, but keep in mind 2 things
- you dont want to condensate vapor and put immediately the water back into the loop. Like someone pointed before, you're just bringing back your heat.
- you'll want to keep a good airflow, good performance, less noise, etc... all this while saving some money (hey, bongs are the less expensive way of watercooling after all).
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