HVAC terminology for temp/efficiency point?

[SonicExplorer]

Is there a term for the temperature point in a home that is the balance-point of efficiency? For example, in my home in Florida there is a specific temperature where efficiency and comfort is optimal, and if I go just one degree higher there is a very noticable energy impact.

To illustrate further: Now that I have a new programmable stat I was able to tune it for some interesting results. We've had over a week of consistent 95 degree weather so I was able to run some decent tests. I found by raising the inside temp up just 1 degree between 2pm and 7pm that it reduced the daily heat pump-related power consumption from roughly 19KW to 15KW. That's quite a savings (21%).

Sonic

[Shophound]

There's a thermal balance point and an economic balance point. They may or may not be at the same point, thermally speaking.

Thermal balance point = pertains mainly to heat pumps in heat mode but can also be applied to a/c. It is when the structure heat gain or loss is at the same rate as the system's maximum ability to create or remove heat.

Economic balance point = again, mostly for heat pumps; the point where it becomes more economical to operate a heat pump on heat strips alone vs. heat strips and compressor in heat mode. For a/c, it's a matter of thermostat set point.