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- Mrs. Kugler asked that I e-mail you some information about the heating system for their house. I realize that the numbers are unexpected, i.e., the R-values for the insulation are very high and the BTUH values for the heat load are very low. I hope I can reassure you:
- I have been designing and building superinsulated houses here in Oregon for 20 years. I am used to low heat load numbers. My first house (in McMinnville) was heated for $95.40 for the first year. Our current house is 18 years old. So far this heating season we have spent $150 for heat.
- The Passivhaus Institute in Germany has gone beyond what I have been doing. They have reduced superinsulated design and building to a science. Over 15,000 Passive Houses have been built in Europe, all according to the Institute's formula. I have designed the Kugler house according to the Passive House standards. With R-values of R-87 for the ceiling, R-60 for the walls, and R-60 for the foundation we have exceeded the R-values required for the Willamette Valley. The German requirement for heat load is 3.17 BTUH/sq. ft. The Kugler house at 1.940 sq. ft. will require 6,150 BTUH at peak load. We have three heating zones, each with a 3,412 BTUH inline duct heater. This totals 10,236 BTUH, so we have a heating system that is oversized by 66%.
- The passive solar component should not be overlooked. My houses usually gain four degrees on a sunny day.
- And now for the ace up the sleeve. The pellet stove can put out 40,000 BTUH. This is almost seven times the heat required.
I hope this reassures you that the Kugler family will not be cold in this Passive House. Please contact me if you have any questions.