Jim & Geri's Home Page

Our HVAC system consists of a small air conditioner and a gas furnace. A single zone covers the whole house. There are 12 supply registers and four return registers.


The graph above shows temperatures at two locations. The outside and office temperatures are taken at 30 minute intervals by a Davis Vantage Vue weather station. These graphs are updated shortly after each hour.


These graphs show the temperature at the supply register in the computer room which is the register closest to the blower. The temperature at the supply registers rises rapidly when the heater fan starts to run. Timing starts when the temperature rises more than five degrees and stops when the temperature falls more then one degree. The lower graph shows selected room temperatures. Register temperatures are captured once a minute with an Adafruit MCP9808 Breakout Board connected to a Raspberry Pi via the I2C bus.