Boulder Pop Top

Boulder Pop Top

Built: 1951

Boulder Pop Top

Remodelled: 1993

Boulder Pop Top

Sq Ft: 2,921

Becoming Carbon Neutral

This customer moved from New York City to Boulder with his family and wanted to make their house carbon neutral. They had radiant baseboard heating for the entire house, a gas hot water heater, and two wall mounted AC units upstairs.

We replaced their gas hot water heater with an electric heat pump model and removed the radiant heating system and the two AC units upstairs. We replaced those units with a 9 head mini-split system powered by two outside condensers. Aesthetics were important to the customer so we used both ceiling cassettes and wall heads to fit what was best for each room. We also added a CERV ventilation system, solar and battery backup, and a SPAN panel to better orchestrate the house.

Not only were we able to get the customer to net zero, but we added zoning to the house with the mini-splits so that each room could be a comfortable temperature. Since the heat pumps provide both heating and cooling, they had AC for the entire house and not just the upstairs bedrooms. With the addition of the battery and the SPAN panel the homeowner felt they had sufficient control to get rid of the UPS backing up their computer system.

The Results

Before

CO2 Production (yearly)

10.8

TONS

Natural Gas Usage (yearly)

1176

THERMS

Total energy use (yearly)

88

MMBtu

Energy Use Intensity Score

Average
US Home

30

1

75

After

CO2 Production (yearly)

0.0

TONS

Natural Gas Usage (yearly)

0

THERMS

Total energy use (yearly)

17

MMBtu

Energy Use Intensity Score

Average
US Home

6

1

75

80

%

Energy Efficiency Improvement

The Results

Before

CO2 Production (yearly)

10.8

TONS

Natural Gas Usage (yearly)

1176

THERMS

Total energy use (yearly)

88

MMBtu

Energy Use Intensity Score

Average
US Home

30

1

75

After

CO2 Production (yearly)

0.0

TONS

Natural Gas Usage (yearly)

0

THERMS

Total energy use (yearly)

17

MMBtu

Energy Use Intensity Score

Average
US Home

6

1

75

80

%

Energy Efficiency Improvement

The Results

Old House

CO2 Production (yearly)

TONS

Natural Gas Usage (yearly)

THERMS

Total energy use (yearly)

MMBtu

Energy Use Intensity Score

Average
US Home

1

75

New House with Gas

CO2 Production (yearly)

TONS

Natural Gas Usage (yearly)

THERMS

Total energy use (yearly)

MMBtu

Energy Use Intensity Score

Average
US Home

1

75

New House with Electric

CO2 Production (yearly)

0.0

TONS

Natural Gas Usage (yearly)

0

THERMS

Total energy use (yearly)

17

MMBtu

Energy Use Intensity Score

Average
US Home

6

1

75

The Results

Old House

CO2 Production (yearly)

TONS

Natural Gas Usage (yearly)

THERMS

Total energy use (yearly)

MMBtu

Energy Use Intensity Score

Average
US Home

1

75

New House with Gas

CO2 Production (yearly)

TONS

Natural Gas Usage (yearly)

THERMS

Total energy use (yearly)

MMBtu

Energy Use Intensity Score

Average
US Home

1

75

New House with Electric

CO2 Production (yearly)

0.0

TONS

Natural Gas Usage (yearly)

0

THERMS

Total energy use (yearly)

17

MMBtu

Energy Use Intensity Score

Average
US Home

6

1

75

The project in pictures

Condensers
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Garage Solar
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House Front
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Meter Gone
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New Water Heater
Alt text here
Span Panel
Alt text here
Span Panel
Alt text here
Existing Boiler
Alt text here
Existing Water Heater
Alt text here
No items found.
Condensers
Garage Solar
House Front
Meter Gone
New Water Heater
Span Panel
Span Panel
Existing Boiler
Existing Water Heater
No items found.

80

%

Energy Efficiency Improvement