Project Description
This home received a complete building envelope update, including new windows and doors, 6" Exterior Insulated Finish System, attic air sealing and insulation and 4" Extruded polystyrene insulation to 18" below grade. It then received a Daikin heatpump for forced air heating, a heat recovery ventilator, and an AO Smith heatpump hot water tank. It was topped off with a 12 kW Solar array.
This homeowner was able to eliminate their operational carbon footprint while achieving a much more comfortable home environment.
Before & After
General
|
|
Before |
After |
Building Condition
|
Before
In need of maintenance |
After
CHBA Netzero labeled |
Comfort
|
Before
Uncomfortable with cold areas in winter and hot areas in summer |
After
Consistent temperatures throughout |
Envelope
|
|
Before |
After |
Ceiling/Attic Insulation
|
Before
R30 |
After
1.5” 2lbs spray foam, R60 Blown in |
Foundation Insulation
|
Before
2×4 walls with R8 effective |
After
R24 XPS effective to 18″ below grade |
Wall Insulation
|
Before
2×4 walls with R8 effective |
After
R24 EPS added to exterior for R32 effective |
Windows and Doors
|
Before
Original 1960s windows |
After
Lux Windows & Glass, Triple Glazed Low-E |
Air Changes per Hour
|
Before
5.22 ACH50 |
After
1.79 ACH50 |
Mechanical & Electrical
|
|
Before |
After |
Heating
|
Before
Natural Gas |
After
Daikin Heatpump |
Cooling
|
Before
None |
After
Daikin ASHP & Electric Furnace |
Hot Water
|
Before
Natural aspirated gas |
After
AO Smith electric heatpump |
Ventilation
|
Before
None |
After
Heat Recovery Ventilator – Greentek PH7.15ES |
Renewables
|
Before
None |
After
12.7 kW Canadian Solar PV array |
Annual Energy Usage
|
|
Before |
After |
Light and Appliance Energy Consumption
|
Before
11.9 GJ |
After
11.6 GJ |
Other electrical consumption
|
Before
14.04 GJ |
After
14 GJ |
Space Cooling
|
Before
0 GJ |
After
0.4 GJ |
Space Heating
|
Before
56.2 GJ |
After
9.2 GJ |
Ventilation Energy Use
|
Before
0 GJ |
After
0.4 GJ |
Water Heating
|
Before
25.9 GJ |
After
4.4 GJ |
Total Net Consumption (with Renewables)
|
Before
108 GJ |
After
-15 GJ |
Total Annual Consumption
|
Before
108 GJ |
After
40 GJ |
Annual Cooling Demand Intensity
|
Before
0 kWh/m2/a |
After
0.75 kWh/m2/a |
Annual Electricity Consumption
|
Before
7222 kWh |
After
11111 kWh |
Annual Heating Demand Intensity
|
Before
105.6 kWh/m2/a |
After
17.3 kWh/m2/a |
Annual Natural Gas Consumption
|
Before
82 GJ |
After
0 GJ |
Energy Use Intensity
|
Before
203.1 kWh/m2/a |
After
75.2 kWh/m2/a |
Carbon Emissions
|
|
Before |
After |
Annual Operational Carbon Emissions – Electricity
|
Before
3538.9 KgCO2e |
After
-2041.7 KgCO2e |
Annual Operational Carbon Emissions – Natural Gas
|
Before
4312.2 KgCO2e |
After
0 KgCO2e |
