Posts Tagged ‘Contractors’

There are two ways that windows help in heating and cooling – by preventing heat loss from the room, and by taking in heat from the outside. The former is measured by a window’s U-Factor and the latter by SHGC. U-Factor measures how much heat is lost through the window. The actual math gets quite complicated – U-Factor tells you how much heat is lost in one hour for one square foot at a certain temperature. A low U-Factor value (usually of 0.35 or lesser) means less loss and thus better insulation. Conversely, some windows may even mention an R-value, which is a measure of insulation. A low U-value corresponds to a high R-value.
SHGC is a value between 0-1. The lower the value, the less the amount of heat a window admits. Depending on the climate and your heating/cooling requirements you will need to pick a window with the right combination of SHGC and U-value. In cold climates, you want a U-value lesser than 0.35 combined with a high SHGC of around 0.60 or higher. This will considerable reduce the load on your heating system. For warm climates, you want the opposite – a low SHGC of less than 0.40 with a high U-value.
Does this mean you will have to change windows to match the seasons? Not necessarily. A metallic oxide layer (called a low E coating) applied on the outside keep the heat out, lowering the SHGC and when applied on the inside decreases the U-value. Even tints work well, though they only reduce the SHGC value.
Does material matter? Very much so, windows made of wood are not very good on insulation, while vinyl and fibreglass frames have the lowest U-values. Metal should be your last option when looking for insulation.

No, we are not switching to promoting green software – we’re going to stick to good ole’ hardware and home building. For a long time, windows have been thought of just as basic necessities to a house, or as ornamental and status-symbols. However, windows are a big factor in terms of our electricity bills, keep us healthier, make our homes last longer, save energy and essentially, save the planet. However, they can do all this and more.
Eco-friendly windows are essentially energy efficient windows. The make, material, frame, size and positioning of windows has a great impact on interior lighting, indoor temperature, heating & cooling systems and indoor air quality. Energy efficient windows work at maintaining optimal levels of all these aspects and thus significantly reducing our bills and our carbon footprint. And with the new eco-friendly wave taking the construction industry by storm, energy star certified windows are easily available. Also, the certification system is such that it works well for different kinds of windows that are made for different home requirements and weather conditions.
Yet, it can still get quite confusing and most of us are not quite familiar with scientific window terminology. Essentially, when you buy energy efficient windows, you will come across a lot of numbers and ratings. There are five things you need to look at:
1. U-Factor (Level of heat transfer)
2. Solar Heat Gain Co-efficient (Heat capturing capacity)
3. Visible Transmittance (Light Transfer)
4. Air Leakage and
5. Condensation Resistance
And that’s why we have a series of how to understand and buy energy efficient windows – without wishing you’d done more math in high school.

1. Adaptability: GHP can be used in a variety of climates and conditions. With air-source pumps, the general external temperature matters quite a bit. However, regardless of surface temperature, the temperature beneath the earth’s surface remains more or less warm, constantly. This makes it possible to use GHP in different geographical regions with different temperatures. Add to this, there are four different types of GHP installations available, depending on different soil, climate and installation costs. The local installer will be able to guide you to the best option for you.
2. High Efficiency: Because the earth’s temperature is more or less constant, GHP provide you with better heating cooling without having to create any heat in the first place. For moving heat, GHPs use only 50-75% of the electricity used by other heat pumps. This makes them extremely efficient, with a rate of 300-400%. They’re also very efficient at controlling humidity, which works great for a wet weather like ours.
3. Durability: GHPs have no moving parts, and the parts are rarely exposed to weathering or destructive elements. As such, with a proper installation, the entire system can last up to 25 years (and certain parts up to 50)
4. GHPs are much quieter that other heat pumps, require less space and can be configured for use in a new home or old one. Plus, it is also possible to control the heat supply and therefore the temperature of different rooms with GHP.

There are also quite a few other things you should keep in mind when buying an installing LED lighting. Having the services of an experienced electrician at your disposal is very important, as is the knowledge of an interior designer who’s worked with LED lighting. Bear in mind the following points:
1. White LED lighting tends to emit a specific kind of white light, which is different from other kinds of white light. This causes certain colors to be seen differently. Thus, you might find that your interiors don’t look the way they were supposed upon installing LED lighting. It is thus important to get a ‘test’ done, or seek professional opinion to see if your interiors will go with white LED lighting. (However, newer LEDs seem to have conquered this drawback)
2. Many people will opt for LEDs specifically because of their aesthetic appeal. However knowing where to use which LED lighting is another important factor determining the aesthetics of the entire setup. An array of LED lightings could be used to illuminate an entire room, while miniature LEDs are great for lighting up stairways, corridors and external paths to the house. Many will also use miniature LEDs for lighting up kitchen closets from the inside. Using the wrong LEDs in the wrong place could lead to an interior disaster.
3. LEDs are the most expensive option – only in the beginning. Their initial high price is off-set by their efficiency (and thus the lower bills) and their lifetime. However, using them correctly is important to ensure this happens. Another aspect we suggest to all our customers who look at green building – When it comes to making eco-friendly decisions, we need to look at life time costs, rather than one-time costs. In this regard, LED seems to win the race.

The Eco Builders Guild \ South Sound Chapter has announced it will host the South Sound Green Tour on April 17th and 18th, 2010
The theme of the event will be Innovation – Education – Inspiration

It will be a community event to celebrate green innovations through education in sustainable building and inspired living.
This year’s tour will showcase the greenest homes and buildings in our area that incorporate significant use of solar or other renewable energies, new and reclaimed materials, low energy consumption and water conservation technologies, and sustainable design techniques.
Educational sessions will be held at various locations and feature real life topics on how to build and live greener. See our website for more details – www.SouthSoundGreenTour.com ( The site should be up and running by January 1, 2010

South Sound Green Tour is looking for participants and sponsors. If you are interested in either contact me at info@laupenhomes.com. After January we you will be able to contact us directly at SouthSoundGreenTour.com