I have never figured the concept behind a two stage furnace, except as a
marketing gimick. If you need heat, when you need heat, -- you need heat.
Getting half the heat seems pointless. I imagine you need a special
expensive thermostat to choose half heat or full heat. Or do you have an
outside thermostat that kicks the full heat on if the outside temperature
goes down a lot, that seems the only logical way to set one up. Personally,
getting full heat for 5 minutes vs. getting half heat for 10 minutes, is not
worth the extra cost and complexity, and I sure wouldn't notice the
difference unless the furnace could not supply enough heat.


"Ray Kostanty" wrote in message
...
Try also asking at alt.hvac.

Dano wrote:
pros and cons to a two stage furnace vs. single stage furnace with equal
EFUE #'s