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What relative humidity should I have in my home? Seems like a simple enough question. However, the answer can sometimes be difficult to understand.

This article is the fourth in a series on various building diagnostic tools and techniques to sleuth out problems in buildings.

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

High performance homes—due to superior insulation, better performing windows and more efficient lighting and appliances, can be expected to have smaller sensible cooling loads than typical new homes… Read More

The issue becomes even more complex when you realize that you can replace the word humidity in the previous sentences with the words "indoor air quality " and not change the meaning or impact.… Read More

A range of house and mechanical system types were evaluated, including standard building enclosures and cooling systems and high-performance building envelopes with enhanced cooling or… Read More

This is all about the current ongoing disasters in Great Britain, New Zealand and Australia that are due to bad insulation and mechanical system retrofits and bad new construction….they are repeating… Read More

OK, we all know this…but for the record…a heat pump water heater (HPWH) uses electricity to transfer heat from the surrounding air to heat the water rather than using electricity to heat the water… Read More