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Outdoor air is added to a building via a controlled ventilation system. What isn't controlled is the air change created by wind effects, stack effects and pressure effects caused by the operation of… Read More

When designing a building’s envelope and its interaction with the mechanical system, temperature, humidity, rain, and the interior climate often are ignored. The focus for the building may be more on… Read More

How water gets into a structure, why it doesn't leave, and how these architectural flaws become HVAC headaches. This two-part article was first published in HPAC Engineering, December 2001 and… Read More

Here we explore issues unique to Veterans Era Housing and present three cases where moisture problems were successfully addressed. Originally published in Home Energy November/December 2001, pages 33… Read More

Multifamily public and low-income housing have particular problems when it comes to moisture and air pollutants. In this first of a two-part series, we look at one particular type of multifamily… Read More

A multi-zone, single-gas, tracer gas decay measurement technique was used to test the ventilation systems of a single-story, slab-on-grade 1350 sq. ft. house in Las Vegas, Nevada, and a two-story,… Read More

This article addresses the issue of undercutting bedroom doors to provide return airflow from bedrooms resulting in risks such as insufficient airflow, pressure imbalance, energy-inefficient loss of… Read More

This article addresses the issue of unsealed conditioning equipment and ducts located outside the conditioned space in a vented attic, unconditioned crawlspace or basement resulting in risks such as… Read More