The underground poly pipe is relatively cheap ($0.10 -0.13/ft) . You will need a dual manifold with valves to regulate air flow to each diffuser. Air hose is cheaper than electric line. Although some day you may want power at the pond for various reasons besides aeration. If you don't plan on keeping some snow off the ice for ice skating and if you have significant autumn tree leaf inputs then aeration in winter might be a good idea especially as the pond approaches 6-10 yrs old when fish winterkill becomes more likely. Normally keeping 20% of the ice snow free allows enough oxygen production under ice for adequate oxygen production. I don't like to see snow lie on all the ice for longer than 3-4 weeks.
