Below is 10kW photovoltaic system recently installed in Ypsilanti. This will save the customer about $250.00 per month on their electricity bill!
Many home owners ask me what the most important green feature would be to implement if funds were limited. Is it solar thermal, photovoltaics, a green roof… My answer is not the most exciting, and it is tough to show off to friends and family, but it is extremely important to any efficient building: controlling air infiltration.
Heat loss and heat gain are the leading contributors to increased utility bills and decreased building efficiencies. When an HVAC system has to work harder to make up for these losses, then even the most efficient system will not operate as cost effectively as it should. The first step in any green building should be to stop the losses.
First, to stop the bleeding, we need to know where the wounds are. I suggest anyone wanting to improve the efficiency of their home, to start with a simple energy analysis. This can be done by hiring an energy inspector which performs a blower door test along with thermal imaging. These tests are very affordable and have a very good return on investment. A blower door test pressurizes the building so that if there are leaks, it will be forced to do so. The thermal imaging helps define where these leaks are occurring.
Once the problem areas are isolated, it is important to come up with a strategy with your builder on how to address each issue. Solutions can be as simple as caulking around exterior windows, or insulating and installing seals on your attic access panels, or fixing a damaged fireplace flue. Sometimes more intrusive solutions may including adding insulation to an attic space or filling gaps within the wall assemblies. A knowledgeable contractor can help you make your house air tight with the right planning. It is important to re-test the home after the corrections are made to assure the problems have been fixed. Ask your inspector about re-inspection charges, they usually have a reduced rate for the follow up inspection.
Another thing to consider when making a home airtight is indoor air quality. If your house tests with a low ACH (air changes per hour), then an HRV (heat recovery ventilator) or ERV(Energy recovery ventilator) may be required to maintain proper fresh air ventilation. A balanced fresh air ventilation system will improve indoor air quality and comfort. HRV’s and ERV’s increases or decreases incoming air temperature, depending on the time of year, to reduce HVAC load. ERV’s also help maintain proper humidity of the home and is recommended in heavy heating areas.
Once the house is air tight, now it is time to focus on other green features like solar thermal or photovoltaics. Otherwise, as may grandpa would say, “it’s like perfume on a pig”.
Greenlife Building, LLC uses a combination of age old techniques and modern technological advancements to build and consult on green buildings. David Eifrid is a LEED AP and has a decade of experience in sustainable building.
What is a Green Building?
A green building uses sustainable building products and practices which decrease the impact on the environment. This includes reducing water, waste, gas and electrical consumption thru innovative products and techniques and using sustainable locally sourced and recycled content materials. Green building also improves indoor air quality by eliminating high emitting building materials and urea-formaldehydes. Greenlife utilizes LEED certification created by the USGBC (U.S. Green Building Council) to assure that everyone involved in the project shares mutual goals toward sustainability.
Why Build a Green Building?
A green building is a healthier environment to live in. Green buildings save money by reducing monthly utility costs without the occupants having to change their accustomed lifestyle. A green building reduces the impact on the environment compared to traditional building practices.
Does it cost more to build a Green Building?
A green building may have a marginal initial cost increase but in most cases, a green building will have a lower net cost.