Our Carrier GreenSpeed central air and heat pump system heats and cools the main living space in our house. We now use oil for hot water and to supplement the heat pump in cold weather. The high performance air filtering system reduces dust and pollen. The system is efficient, quiet and comfortable.
The air handler is located in the attic, with short ducting runs to the bedrooms and the main living space. By insulating the attic roof (not the attic floor), the air handler is protected from temperature extremes, thus improving the overall comfort and efficiency.
We don’t use temperature setbacks much. We find that whatever energy savings occur with a lower temperature overnight is exceeded by having the system run at full tilt to restore the higher room temperature in the morning. It is better to keep a steady temperature.