Improvement of Indoor Air Quality (IAQ) is of interest to many of the people that are pursuing an Energy Audit. Over the last 40 years, many of the worst outdoor air pollutants have been controlled, reduced or eliminated as a problem. New understanding of air pollution, new technology and new approaches have all had roles in these improvements.
As the improvement has been happening outside, people have begun to take a stronger look at what is happening inside their homes. Again new understanding of how a home works, new technology, and new approaches to handing indoor air have a role in improving IAQ.
In building a new home, following the Indoor Air Plus specifications, part of the Energy Star program, provides for long term Indoor Air Quality basics. Following many of these specifications gives each homeowner a guideline to apply to improvements in an existing home. It is easier and less expensive to build a home with these features. It is also possible to incorporate many of them into an existing home.
The list and discussion below provide information to homeowners about those improvements that are cost effective to implement and can be done over time or immediately. These are all improvements that will improve or maintain the indoor air quality and at the same time will improve the durability of the home.
Heating and Air Conditioning System
- Ducts are sealed in all accessible areas.
- Pressure Balance Supply to each room and Return from each room. Use Jump or transfer ducts as needed to maintain balance.
- Install a whole house type ventilation system to meet ASHRAE 62.2.2010 specifications.
- Spot exhaust fans in bathrooms, kitchen, laundry, dryer, central vacuum systems are exhausted to the outside, not into the area between floors or the attic. Use the specifications of ASHRAE 62.2.2010 here as well.
- Adjust HVAC to maximize dehumidification in the summer.
- Do not run HVAC blower on ‘On’ or circulate; use the Auto setting.
Combustion Pollutant Sources
- Change furnace to sealed combustion unit
- Vent Fireplaces outside and have them checked to verify they meet emission standards.
- Install a Carbon Monoxide Alarm in each sleeping zone and in any room with a standard gas hot water heater or gas range.
- Consider changing conventional atmospherically drafted hot water heater to electric or Tankless Demand with sealed combustion.
The Attached Garage
- Air seal all common walls and ceilings in the garage. Maintain the air barrier by repairing holes, cracks in the drywall.
- Install an automatic door closer on any doors into the home, from the garage. A spring loaded hinge will meet this item. Do not prop the door to the garage open or use this opening to bring fresh air into the home during spring or fall.
- Consider installing a ventilation fan to the outside, rated at 70 cfm in continuous use. Provide make up air source with this improvement.
Materials used in any Future Remodels
- Certified low-formaldehyde pressed wood materials (plywood, OSB, MDF, cabinetry.
- Certified low-VAC or no-VOC interior paints and finishes used.
- Carpet, adhesives, and cushion quality for CRI Green Label Plus or Green Label testing Program
The last step in any Indoor Air Quality program is filtering the air.
Most people start with this step. It is really the last step. If you keep stuff from getting in, you don’t need to filter it out. Somewhat like closing the barn door after the cow is gone.
Duct Cleaning Services
Due to the varied construction of heating and air ducts, the heavily advertised duct cleaning service presents unique problems. The use of panned body cavities within walls and floors means ducts are not smooth inside. Flex Duct with increased friction losses, possible tight bends and up and down runs also creates issues. The EPA advice is without compelling visual evidence of an extreme problem, duct cleaning is not advised. You may view the entire EPA Web Page http://epa.gov/iaq/pubs/airduct.html
Where Do I Start?
Get some Professional Advice. This should involve a complete review of your home. It can be done by someone that is selling a service. The assessment can be done by someone that doesn’t not have a financial interest in a product or service that may be recommended after the assessment. It is your home, it is your choice!
Efficient Energy Savers can do this assessment. It can be done stand alone, or with a comprehensive Home Energy Audit. Call or e-mail for more information.