162.248.50.20

Archive for April, 2011

Windows and Home Energy Performance

Windows and Home Energy Performance

Posted on 26. Apr, 2011 by .

5

Many architects have yet to realize how much a window’s energy performance can impact their projects, especially under the new Title 24 energy code. Ordinary glass is great at letting in daylight but it’s a terrible insulator. It also does little to block the sun’s heat in the summertime. Windows lose heat through the glass, and they can also leak air around the edges of the frame.

Here are a few analogies to understand the different ways that windows can lose both heating and cooling energy. If you wear a big holey sweater in the wind, it doesn’t keep you very warm. That’s air leakage. Now, imagine just wearing a single sheet of clear plastic on a winter day. It’s a better windbreaker than that holey sweater, but you’ll still feel pretty darn cold. That’s because a thin sheet of plastic, like a single sheet of glass, is a poor insulator. And remember what happens to your car parked in the summer sun? It gets 20 degrees hotter than the outside, or more – if you have black vinyl seats, you’ll scream when you sit on them in your summer shorts. That’s solar heat gain.

[...]

Continue Reading

California Energy Upgrade Incentives

California Energy Upgrade Incentives

Posted on 26. Apr, 2011 by .

0

Recently, Green Compliance Plus was contacted by Jeffery Liang of Ecology Action, a nonprofit group engaged to promote information to the public about the rebates and incentives available through Energy Upgrade CA. Here’s the result of our conversation.

What is Energy Upgrade CA?

It’s a statewide incentive program for California homeowners that offers rebates for overall energy improvements. In the past, utilities like PG&E have offered rebates for single measures, like a furnace upgrade. However, this is a bit like going to the doctor and getting a cure without first getting an overall diagnosis. This program attempts to rectify this piecemeal approach by encouraging homeowners to start with a complete home energy audit in order to understand where the biggest shortfalls really are within their particular home.

The way it works is the homeowner selects a qualified contractor (see below), who performs the initial energy audit, physically installs the energy upgrades, and then submits the rebate paperwork to the utility company on behalf of the homeowner.

[...]

Continue Reading