Ian M. Shapiro

V-Strip Weather Strip Update: Two Years Later

Author: Ethan Skutt and Ian M. Shapiro

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November 21, 2014

An important factor in the airtightness of a building, and its energy efficiency, is the amount of infiltration allowed through closed windows and doors. Typical old double-hung windows are especially prone to infiltration. [continue reading]

Heating Loads: Upstairs Versus Downstairs

Author: Ian M. Shapiro

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September 06, 2017

Some time ago, my colleagues and I at Taitem Engineering observed that two-story buildings with open staircases used significantly more heat downstairs than upstairs. We saw this in two buildings. This led to further investigation ... [continue reading]

Heat Pump Water Heaters: Bring Them Upstairs?

Author: Ian M. Shapiro

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September 14, 2018

Heat pump water heaters are seeing increasing use in homes. They go well with solar PV and so support strategic electrification to reduce carbon emissions. And they are more efficient than electric-resistance water heaters. Several ... [continue reading]