Solar-PV-Powered Heat Pumps: Why not all homes?

Irrational Exuberance about Heat Pumps The  Passive House and Net-Zero movements  have spawned some irrational exuberance about heat pumps. When you build a home that requires less than 5 BTU/hr per square foot of floor space, you can often heat and cool it with...

Passive Houses

What is a Passive House? The passive house concept was pioneered in the Northern U.S. and Canada in the late 1970s and early 1980s when it was called “superinsulation”. European builders have improved the superinsulation technology and applied it to both...

Energy Conservation for Buildings: Our Best Investment

Approximately half of all energy used in the U.S. is consumed within buildings. Half of that energy is wasted because of shortsighted design, sloppy construction practices, and careless building operation. Energy conservation in buildings is the easiest and best...

Natural Cooling to Beat the Heat

The seasons are heading into fall.  It gets cool at night, but the temperature still climbs to plenty warm during the day.  Here in Helena, Montana, we’re dropping down to the low 40s and upper 30s in the evenings and climbing up to the upper 70 and sometimes...

Cooling Your Home with Night Air

Tired of your house always being hot? Nighttime ventilation works well for cooling buildings in many climates, especially in milder summer weather. Nighttime temperature and relative humidity are big factors for determining whether you can use nighttime ventilation....