The Set Up

Heating

Situation:

House is uncomfortably cold in the winter time without enough heating available. The back of the house is especially cold during these colder months. This area includes bed- and bathrooms as well as Bern’s office.
Bern works mostly from home and needs to run an electric heater when it gets too cold in his office. We also run electric heaters in the bathrooms. Without heating, bath towels won’t dry during cold days and nights. I often take towels after we showered and let them dry in the warmer living room, of course I forget to put them back before I take my next shower…
I let our mini split run all day during cold periods in the front of the house where I work. Due to the open floorplan of our house the heat spread unevenly and creates hot and cold spots, especially in the evening.
We have slab on grade, concrete floors throughout the house, which are uncomfortably cold during the wintertime

Cause:

House is very leaky and inside warmer air transfers fast by convection to the outside colder air in winter.
House has no wall insulation. House was build with 8″ hollow concrete blocks with paint on both sides nothing else. Again, warm air transfers fast to the outside, this time by conduction. Exception is one room addition to house, finished in 2015 with R-22 insulation.
House has various levels of roof insulation, in some areas never replaced in some areas replaced and added but installed improperly with gaps during previous remodel.
The slab on grade concrete floor does not have any insulation and extends to the outside at 80% of the house to a veranda, breeze way and sliding door sill. It creates a huge thermal bridge transferring any warmth from the inside floor quickly to the outside. The inside floor is always cold no matter how much we heat.

General Information 
Building Type:Detached single family
ranch-style house
Year of construction:1948
Location:US -Rolling Hills, CA 90274
Construction type:Hollow lightweight CMU
Treated Floor Area:
(Passive House Institute)
2,500 sq ft / 232 sq m
Conditioned Floor Area:
(CA Energy Code)
2,578 sq ft / 240 sq m

The Team 
Architecture:
Building services
Building physics:PV Blue
General Contractor:
Passive House Certifier:
Current Thermal Envelope 
Exterior Wall:
Floor Slab:
Roof:
Window Frame:
Window Glazing:
Entrance Door
EnerPHit Thermal Envelope 
Exterior Wall:
Floor Slab:
Roof:
Window Frame:
Window Glazing:
Entrance Door
Current Mechanical Systems 
Ventilation:
Heating installation:
Cooling installation:
Domestic hot water:
EnerPHit Mechanical Systems 
Ventilation:
Heating installation:
Cooling installation:
Domestic hot water:
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2018-03-27T14:46:18+00:00

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