Now, to economics
If a passive solar house was to keep the temperature constant in the comfortable zone of 20–25 degrees Celsius, it would cost more to run and build compared to an equivalent Passive House.
Moreover, it would need to be calculated as it is with Passive House to make sure what is built achieves this performance.
- Lower temperatures will cause too high a mould risk.
- Higher temperatures are not comfortable without running an active fan, which could be acceptable to about 27 degrees Celsius.
20–25 degrees Celsius is comfortable, healthy and safe.
Passive House has no guesswork when it comes to economics.
Passive House allows for some heating and cooling because zero energy is not economical.
Every decision can be made upfront keeping the economics in check.
Now to the question: “How much more does a Passive House cost?”
From 10% less to about 20% more.
Yes, it could even be cheaper to build than traditional construction.
Generally, it costs more to build, but over the lifetime of the building, it will be economical, and energy-price fluctuations have nearly no impact on a Passive House.
The break-even point is usually reached before the end of the loan repayment.
I hope this explains why the Passive House approach is the way to go, and I recommend every passive-solar designer to undertake the Certified Passive House Course.
If you are in or want to come to Australia, you can do the course with me. However, the course is offered worldwide, and I am sure there is a provider close to you.
Passive-solar designers, you can be the elite of Passive House designers and help less-experienced designers to improve their skills.
We are all in the same boat and have equal responsibility for the health of our clients and to reduce the 39% of the world’s CO2 emissions caused by construction and the use of buildings.
This is your opportunity to become Passive House certified. Visit our website here for more information.