Super-Insulated House Heats For Under $100/Yr

Super-Insulated House Heats For Under $100/Yr BUILDINGS Houses Super-insulated air-tight homes that require almost no outside source of heat to stay warm even during long Canadian winters are the wave of the future say Saskatchewan builders who ve constructed some of the first conservation houses anywhere In Montana Dave and Marcia Borst of Butte live in a super-insulated home built by Buffalo Homes also of Butte They ve spent $5 for heat since last February If it s cool in the morning when I get up I bake a batch of cookies or a loaf of bread That s enough to warm the house to 68 or 70?F A boiling tea kettle will take the chill off most mornings says Marcia Borst However she notes that in the summer you have to be careful to bake in the morning or at night You have to plan for the heat gain The Borsts say the house is extremely quiet and draft-free They suggest that a super-insulated home might be especially suited for anyone with allergies such as hay fever if care is taken to keep the allergy-causing materials out David Eyers construction engineer for an experimental building project in Regina Sask told FARM SHOW that they ve been able to build conventional looking super-insulated homes that operate with heating bills of less than $100 per year without any kind of solar heat wood-burner or other alternative heat source The houses are so tight that they re heated with only the body heat of people cooking hot showers baths laundry and other activities that generate heat The conservation house is based on several principles says Eyres It must be highly insulated have an airtight vapor barrier adequate ventilation a heat exchanger and be built to capture the sun s heat without using special equipment Here are the details on each feature: Insulation: A 2-story wood frame house with a crawl space should have double studded walls with 12 in of insulation and ceilings with about 20 in The crawl space should be insulated to an R-value of 35 and the underside of the basement floors should have an R-value of 10 Those values are about double or more those of a conventional house Vapor barrier: A layer of 6 mil polyethylene is placed between the inside and outside walls Special techniques developed by the Canadian National Research Council the project s sponsors make it possible to achieve a near-perfect airtight seal even around windows doors and vent pipes In conventional construction the vapor barrier has many gaps and holes for air to leak through Ventilation: In the conservation house one complete change of air takes place very six hours compared to a change of air every two hours in a conventional house By having less outdoor air to heat energy use is reduced 65% The system can be stepped up to exchange 80% of the air every hour if necessary Heat exchanger: This is the furnace in the conservation house It collects the stale warm air in the house and forces it out at the same time drawing in cool air But the key point is that all cold air that comes in through the heat exchanger is warmed by the- stale air going out Eyers says the exchanger recovers 70% of the heat in the exhausted air Passive solar heat: The house is oriented to the south to catch the sun is painted brown to absorb heat and 90% of the window space is on the south side Eyres mentioned some other details that create the optimum energy-efficient house: The conservation house is a 2-story cubical structure which exposes a minimum of exterior per square foot of floor space It also has deciduous trees on the south side to shade out the sun in summer but let it come through in winter The average cost of a super-insulated house built in Saskatoon Sask in 1980 was $60 000 excluding the lot A similar conventional house would have cost $55 000 according to Eyers How about using the super-insulation concept on older homes? We bought six older houses in various styles and designs and made them energy efficient Eyres told FARM SHOW Generally the cost of converting an old house is much higher than building it into a new one It could cost $10 000 to $15 000 with a contractor and about one-third less doing it yourself

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