Thornleigh Passivhaus

We had about a dozen or so people through for Sustainable House Day 2026 . Always a great day with lots of conversations with very interesting people. A couple different people asked about house performance relative to the PassivHaus design spec: Temperature performance (based on just over 6 years of data): Keep in mind that we aim for 18 - 25 °C rather than 20 - 25 °C. At the hot end, we have experience 1.1% of hours above 25 °C. Indoor, our maximum recorded temperature was 26.6 °C, and in comparison the outside max was 42 °C. I would translate as... 26°C inside feels really nice when it is 42 °C outside. Less than 0.03% of hours have a temperature < 18 °C, and 5.6% of hours have been between 18 and 25 °C.  Energy Use : Again over the same timeframe (minus a few months with some data issues associated with reconfiguring the system for batteries). Mean energy usage is 13.3kWh per day. Mean production is 13.0kWh per day, with half of our energy use being met by onsite product...

April: Summer has departed. Outside temperatures ranged from 8 to 30 °C (median temperature 17 °C), while inside we were a comfortable 19 to 24 °C (median 22 °C). The HRV was mostly between seasons and the split system off. With the sun mostly out the solar production was solid. Temperature from inside and outside the house as the percentage of hours in 0.5 °C bins. I've scaled the temperature in hope that I will be able to use the temperature range for all months. We have made a decision to keep the house above the WHO recommended 18 °C rather than the passive house standard of 20 °C. Methods:  I have taken the 5 minutely data from the wirelessTag sensors and calculated the median temperature for each hour and determined the proportion of hours falling inside of the 20 - 25 °C target temperature (using the R functions 'aggregate' and 'hist'). Inside includes data from the wirelessTag sensors spread across nearly every room of the house. Outside is the data fr...