This is the fifth winter since I've been heating my house with a Mitsubishi* heat pump. And finally I got to see something I've missed every time it happened until last week. Yep. I'm talking about seeing frost on the…
My wife and I bought our 1961 house in 2019, and it came with a basement in pretty rough shape. It smelled musty. There was evidence of moisture damage. The slab was cracked along the perimeter of the exterior walls. …
Oh, the dreaded "cold blow." That's HVAC technician-speak for a forced air heating system that blows cold air on the occupants of a home. Is it really a problem? Is the supply air from a heat pump really cold? How…
Last week at the 5th annual HVAC School Symposium in Florida, I gave a talk on undersized heating and cooling systems. You know, those systems that just can't keep the house warm enough in winter or cool enough in summer. …
Bathrooms need some way of exhausting air. Mostly it's to keep the humidity down, but, depending on who lives in the house, the bathroom also can be a source of a lot of volatile organic compounds (VOCs). Not all homes…
Ah, who can resist the ambiance of a crackling fire! Well, it turns out quite a few can. Whether to use a fireplace or not is a controversial topic in building science. The main problem is that a typical wood-burning…
A lot of volunteers gathered in Decatur, Georgia this past weekend for the annual Martin Luther King Jr. Service Project. They worked at a number of sites doing all kinds things to improve the homes of low-income senior citizens. The…
Everyone's talking about heat pumps. These machines for heating buildings can exchange heat with the outdoors in multiple ways, of course. Ground-coupled heat pumps pull heat out of the ground or water and send it to heat the building. But…
This week I saw a photo that will haunt me for the rest of my life. It's one thing to know something. It's another to see it. I've been writing about indoor air quality and the health effects of indoor…
Here we are in the midst of another holiday season. You may already find yourself in a house full of relatives and friends, wondering what you might be able to do at the last minute to improve your indoor air…