[Kedar Nimbalkar] thought so, and built a soda fountain that you can install right inside a fridge. The system is based around using small pumps marketed as “6V DC air pumps” on Amazon.

Heat-pump technology is currently used in a lot of different products, but the primary one you already have is in your kitchen: your fridge. Heat pumps are a very efficient way to move heat from ...

Looking to save on hot water? A heat pump water heater could slash your energy bills -- if your home is a good fit.