Danny D'Amico wrote:
On Sat, 14 Dec 2013 18:24:04 -0500, krw wrote:

After using one, the thing that sold me on the Nest was the ability to
control the second-stage heat. Since no one was living there, I
didn't care about recovery time so turned off the second stage unless
it took more than two hours to recover.

What's a second-stage heat?

Googling for 'second stage heat', I find it's apparently related to
heat pumps.

So, I guess I don't have that (since I never saw a heat pump in my life).

Hi,
Heat pump or forced air furnace or air conditioner has multi stage ones.