Investing in Solar Electricity. What’s the Payback?

What is the energy payback for photovoltaics? Producing electricity with solar photovoltaics (PV) emits no pollution, produces no greenhouse gases, and uses no finite fossil-fuel resources. The environmental benefits of PV are great. But just as we say that it takes money to make money, it also takes energy to save energy. The term “energy […]


Protect Yourself from the Sun

Sunlight contains ultraviolet (UV) radiation, which causes premature aging of the skin, wrinkles, cataracts, and skin cancer. The amount of damage from UV exposure depends on the strength of the light, the length of exposure, and whether the skin is protected. There are no safe UV rays or safe suntans. Skin Cancer Sun exposure at […]


Top 10 Tips to Stay Cool & Save Money in the Summer

Use these Easy and inexpensive solutions for business or home to stay cool and comfortable without stressing your pocket book.


Basic Passive Solar Design Techniques

Passive solar homes range from those heated almost entirely by the sun to those with south facing windows that provide some fraction of the heating load. The difference between a passive solar home and a conventional home is design. And the key is designing a passive solar home to best take advantage of the local […]


Clean Choices for Heating, Cooling, and Lighting: RENEWABLE ENERGY AT HOME

Part 12 of Buying and Using Renewable Energy at Home. Heating and cooling uses more energy and drains more energy dollars than any other system in your home. Typically, 44% of your utility bill goes for heating and cooling. What’s more, heating and cooling systems in the United States together emit more than a half-billion […]


How to size a Photovoltaic System to Meet Your Needs

After you have assessed the appropriateness of your site, you need to determine how much electricity your PV system must generate. This depends on how much electricity your loads require. Again, your dealer can help you with sizing a system that will meet your needs. The sidebar illustrates the steps involved in sizing a PV […]


When Are Photovoltaic Systems Appropriate?

People select PV systems for a variety of reasons. Some common reasons for selecting a PV system include: Cost—When the cost is high for extending the utility power line or using another electricity-generating system in a remote location, a PV system is often the most cost-effective source of electricity. Reliability—PV modules have no moving parts […]


Sunspace Design Guidelines

Part 3 of Sunspaces. Passive solar systems structures are conceptually simple. However sunspace designers and builders must pay close attention to details to ensure maximum performance and reliability of the structure. Computer software is now available to help design and establish criteria for specific projects such as passive solar sunspaces. This software makes it relatively […]


Sunspaces: Design Considerations for various functions

Part 2 of Sunspaces. Sunspaces serve three main functions: they are a source of auxiliary heat, they provide space to grow plants and have fun living areas. The design considerations for these features are very different, and although it is possible to build a sunspace that will serve all three functions, some compromises will be […]


Sunspace Basics: Introduction

Part 1 of Sunspaces. Everyone living in a home with a sunroom or sunspace will tell you that it is the most comfortable room in the house. Many times the homeowner only complaint is that the sunspace should be bigger. Although aesthetics often drive the decision to add a sunspace to a home design, sunspaces […]


Siting and Design: Landscaping for Energy Efficiency

Part 4 of Landscaping for Energy Efficiency. A well-informed and well-designed home admits low-angle winter sun, rejects overhead summer sun, and minimizes the cooling effect of winter winds. If you are building a home, pay attention to its orientation. In the northern hemisphere, it is usually best to bring home long axis in an east-west […]


How do you choose among competing bids?

Part 11 of Get Your Power from the Sun. If you decide to get more than one bid for the installation of your photovoltaic system (always a good idea), make sure that all bids are made on the same basis. For example, a bid for a system mounted on the ground is usually very different […]


Is your home or business a good place for a photovoltaic system?

Part 5 of Get Your Power from the Sun. Can you locate your system so it works well? A well-designed photovoltaic system needs clear and unobstructed access to the sun’s rays for most or all of the day, throughout the year. You can make an initial assessment yourself. If the location looks promising, your photovoltaic provider […]


What is a solar electric or photovoltaic system?

Part 2 of Get Your Power from the Sun. Photovoltaic (PV) systems convert sunlight directly to electricity. They work any time the sun is shining, but more electricity is produced when the sunlight is more intense and strikes the photovoltaic modules directly (as when rays of sunlight are perpendicular to the photovoltaic modules). Unlike solar […]


Saving Energy with Lighting

Part 8 of Ways to Save Money on Energy at Home. Increasing your lighting efficiency is one of the fastest ways to decrease your energy bills. If you replace 25% of your lights in high-use areas with fluorescents, you can save about 50% of your lighting energy bill. Indoor Lighting Use linear fluorescent and energy-efficient compact […]


Construction Considerations: Earth-Sheltered Houses

Part 4 of Earth Sheltered Houses. The climate in your geographical area will determine whether an earth-sheltered house can be a practical housing solution. Studies show that earth-sheltered houses are more cost-effective in climates that have significant temperature extremes and low humidity, such as the Rocky Mountains and northern Great Plains. Earth temperatures vary much […]


Advances in Glazing Materials for Windows

Part 1 of Advances in Glazing Materials for Windows. Until recently, clear glass was the primary glazing material used in windows. Although glass is durable and allows a high percentage of sunlight to enter buildings, it has very little resistance to heat flow. During the past two decades, though, glazing technology has changed greatly. Research […]


Blocking the Heat

Part 3 of Cool Your Home Naturally. Two excellent methods to block heat are insulation and shading. Insulation helps keep your home comfortable and saves money on mechanical cooling systems such as air conditioners and electric fans. Shading devices block the sun’s rays and absorb or reflect the solar heat. Insulation Weatherization measures—such as insulating, […]


Cooling Your Home Naturally

Part 1 of Cool Your Home Naturally. Keeping cool indoors when it is hot outdoors is a problem. The sun beating down on our homes causes indoor temperatures to rise to uncomfortable levels. Air conditioning provides some relief. But the initial costs of installing an air conditioner and the electricity costs to run it can […]