Airtightness construction trends.

mechanical ventilation is needed to avoid indoor air quality problems. Many new conventional houses have low natural air change rates ...... and are tight enough to require mechanical ventilation, but most have none.

The little house that could.


What's being built out there? Performance tests on 100 new homes.

There is a substantial gap between truly energy-efficient construction and what is currently being built. The problems range from lack of training to carelessness. But there are ways to cure the problems and bring best practices into widespread use.