Start-up Aeroseal has been getting decent media exposure lately with a writeup on Energy.gov and a listing on This Old House‘s Top 100 Best New Home Products of 2011.  The company has an exclusive license to technology originally developed within the Indoor Environment Program at the Energy Department’s Lawrence Berkeley National Laboratory.  In short, Aeroseal sends a sealing mist through air ducts to eliminate holes and cracks of up to 5/8th of an inch — resulting in improved comfort and energy savings.

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When we bought our 1958-model home, it was newly painted but there wasn’t much else that was new about the place.  The toilets were old and less efficient than modern-style commodes, especially some of the WaterSense versions on the market.  One might think it’s expensive to replace an old toilet with a water-efficient model, but it’s not.  I was able to swap out mine for less than $120, all costs included.  Here’s how:
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Appraising a home is difficult work that’s made more difficult with the growing popularity of high-performance homes.  Appraisers have access to training to learn how to better value energy-efficient homes, but a lot of what’s in the home is behind the drywall.  Or may not be apparent with a site visit.  Which is why I like this addendum created by the Sustainable Finance department of the Earth Advantage Institute.

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On average, about 18% of home energy consumption is for water heating, the second largest consumer behind space heating.  The primary technology used to do this is the tank-type water heater (both gas- and electric-powered), but solar water heating can be a cost-effective way to generate hot water. 

Solar hot water systems vary, and one system we’ve mentioned previously is a passive-pump system by Virginia-based Sunnovations.  This video explains it.

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A smart homeowner can save up to 20% on heating and cooling costs with proper sealing and insulating, according to EnergyStar.gov.  Assuming the air-sealed home has sufficient and adequate ventilation, air sealing is supposed to reduce energy costs and improve indoor comfort.  One area that typically needs attention is recessed lighting.  In the video above, Yves Vetter of Vesta Home Performance, explains how to seal a can light from below.

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Although formaldehyde is now listed as a known carcinogen by U.S. Department of Health and Human Services, humans will be exposed to this substance in the environment, at home, and in the workplace.  It’s in soil, food, and water, not to mention one of the primary methods of exposure: indoor and outdoor air.  And besides being a carcinogen, health effects include eye, nose, and throat irritation; wheezing and coughing; fatigue; skin rash; and severe allergic reactions, according to the EPA.

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