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Heating Up, But Slowly

Last week we talked about that mug of coffee and the notion of thermal capacitance. Thermal persistence is another way to think of this concept.

To one degree or another things are slow to change temperature. This is due to both the way heat is transferred (convection is rapid while conduction tends to be slower)and the […]

Cold and Getting Colder (at least north of the equator)

We’ve turned the calendar to a new month and year—Happy New Year readers! We’ve also turned the corner of the Winter Solstice, at least here in the Northern Hemisphere, and are headed to longer days.

We may be getting more daylight, but it will be about six more weeks until the average temperature begins to increase. […]

Accurate but not Exact

As we inevitably move into winter here in Vermont, talk often turns to the weather, and in particular, the temperature. We all live with some unrealistic illusions about temperature. For instance, people can be tricked into thinking they are comfortable simply by adjusting a thermometer to show a slightly higher temperature, and in fact they […]

Winter Arrives

I captured this photograph last week at sunrise showing that winter has come to the small town of Montpelier, Vermont where I live. The golden dome of our statehouse can be seen in the lower right against a backdrop of the Green Mountains.

Here in Vermont, as well as in much of the rest of […]

Bundle Up Your Overcoats!

Adding more layers of clothing helps us keep warm in the winter by reducing heat transfer. But Frosty seems to do just fine without any additional layers.

In much of the country, including NC and GA where I just spent a couple weeks, the weather is quite “seasonal,” meaning it is getting cold—right on schedule […]

Getting Ready for “Winter” Building Energy Inspections

John Snell in Winter Mode

As winter makes itself known—undeniably so here in Vermont, with hard frosts, flurries of “hard water” and a couple feet of snow in the mountains—it is useful to review the procedures and techniques for using our imagers to find problems, especially those in buildings.

Industry standards, including the new RESNET Guideline, […]