Ductless Mini-Splits Can Get Nasty Inside
Have you ever used a flashlight to look up into the part of a ductless mini-split where the air blows out? I should have done that a lot sooner than I did. It turns out these heat pumps can get…
The Energy Vanguard Blog
A Fistful of New Building Science Videos
We're doing some new things here at Energy Vanguard. We've had a YouTube channel since 2010 but haven't done much with it. So one of the new things is working on putting out new videos every week. Here are the…
Do You Really Need to Run the Bath Fan in Summer?
In the comments of my last article, RoyC made an interesting point. "I don’t usually run my bathroom exhaust fan during a shower when it is hot and humid out," he wrote. I'm sure that statement shocks a lot of…
10 Ways to Reduce Your Indoor Humidity
With our changing climate, more people are having to deal with higher humidity for longer periods of time this summer. I'd say this has been probably the worst summer for humidity since I moved to Georgia in the summer of…
A Burnt Grilled Cheese and the Collapse of Indoor Air Quality
I burned a grilled cheese sandwich recently. I tried to bury the evidence by throwing it in the trash and forgetting about it, but my dear, sweet wife fished it out. "You need to tell the world about this," she…
To Zone or Not to Zone…and How?
Unless you have a simple, small home, you probably want more than one thermostat to control the heating and cooling. That lets you control the conditions separately in different areas. And that's where zoning comes in. A common example is…
Will a Heat Pump Work With Your Existing Ducts?
OK, you're thinking of replacing that old furnace in your home with a new heat pump. But you have doubts. You've heard that heat pumps don't heat as well as furnaces. (Wrong.) Or that they'll jack up your electricity bills…
Concrete, Steel, and Demolition in My Basement
Things are heating up in my basement now. Really. Our outdoor temperatures have risen since I began my basement renovation in early February and I still don't have heating and cooling down there yet. So it's getting a bit warm…
Going Deeper With Control Layers
Controlling the flows of heat, air, and moisture is where building science begins. This is so important that I devoted more than a third of my book to the building enclosure and control layers. As much as I love discussing…
The Achilles’ Heel of Heat Pumps
Air source heat pumps are a great way to keep a home comfortable. On the cooling side, they're exactly the same as an air conditioner. In heating mode, though, they have a limitation that other types of heating equipment don't…