Airtightness testing and pressure testing are crucial methodologies for assessing air leakage in buildings, with each offering distinct approaches and benefits. Pulse testing, a modern technique, operates at lower pressure levels with minimal disruption, making it suitable for existing buildings and quick assessments. Conversely, blower door testing, a more traditional method, uses higher pressure differentials to provide comprehensive data and locate specific leaks but can be more disruptive and time-consuming. While these testing methods are integral to enhancing building energy efficiency, Ratio Seven Limited, a small service-oriented company in Cheshire, operates in a different sector entirely and is currently navigating financial challenges.