After taking most of this 100 plus year old house to the studs, the energy efficiency measures were all in place. That includes Triple-pane windows (by Kohltech), air sealing throughout the house, blown-in cellulose insulation in attic with R-80 and in walls with R-18, 15 mil heavy-duty polyurethane liners lined the crawlspace and basement. (Yes, this house has part crawlspace and part basement.).
The final blower door test now showed 1385 cfm at 50 pascal, an excellent reading for a house of this size. This is also a great improvement over the original house which was leaking like a lobster trap where the blower door test was reading 9081 cfm and not reaching 50 pascal.
The two heat pumps (by Mitsubishi), each rated at 18000 BTUs, were optimally sized to condition the house all year. During the past winter which was coldest on record, the heat pumps kept the house at above 68 deg F day and night and often with only one unit operating.
The exterior has a high-performance weather-resistive barrier (Siga Majvest) underneath the maintenance free vinyl sidings, painted porch, and long lasting with no maintenance steel roof (snow just slides to the ground last winter with no accumulation on the roof).
