INTRODUCTION

Mr. Davis, the consummate architect, relaxes against the piano in his sundrenched living room. It is February 12, approximately 1:30 PM, and the low winter sun reaches long tendrils of brilliant light and heat across the hardwood floor. “Oh, yes, the light is lovely,” he agrees. “It’s so warm down here that in winter, I turn the heat off at night. But in the morning, it’s chilly! I come downstairs, turn the heat back on, and go back up to bed until it warms up!”

“In the summer, it’s much darker down here, and cooler, but it gets quite hot upstairs. Late summer afternoons, about 6, I go upstairs, open all the windows, turn the fan on low, and then go up again to turn it off at midnight; it’s too noisy for sleeping. It’s a bit of a problem on really hot days, but we don’t have that many.”

C & D Energy Detectives exchange knowing glances. Mr. Davis is navigating an extra 60 steep steps per day on behalf of his thermally challenged house. Twelve thousand Americans die each year from falls on stairs, according to Prof. Jenny Young in Human Context of Design. Electricity is an inefficient way to generate heat, even with EWEB tilting at windmills. And global warming has only just begun.

Building Highlights

Building Highlights
1. Completed Date:1990
2. Location: Eugene, Oregon
3. Two-story wood frame with gable roof
4. Plywood subfloor over crawlspace
5. Unobstructed southern exposure
6. Electric forced-air furnace with floor registers
7. Remford fireplace and brick chimney
8. R-19 insulated roof, walls, and floor

Preliminary Questions

Questions

* How could the living room be so hot when the adjacent kitchen and studio were so cool?
- Was it the height of the southern windows and glass doors?
- Was it the total southern glazing area?
- Was it a special high-SHGC glass?
- Was it the concrete pavers outside the southern glass?
- Why wasn’t the mass of the fireplace helping?

* Would more mass help? How much? How much would it take to let Mr. Davis sleep an extra hour?

* Why wasn’t the heat rising up the stairway into the second story?

* And what did those little yellow squares mean?

Hypotheses >>