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The Purple House was once an energy-hungry 1940s home running on gas, but itโs now a super comfortable and efficient all-electric home that rivals new builds. After a deep retrofit for thermal comfort and energy efficiency, the transformation is remarkable.
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In planning for their retirement the owner of the Purple House wanted to find ways to make their outlook more financially secure and predictable. They wanted to find ways to avoid Bill-Shock, improve the comfort of their home, and in-turn reduce their footprint on the planet.
85% reduction in heating energy requirements.
Abolishment of gas connection and associated running and connection costs.
Approximately $2000 per year energy bill savings.
Maximised self-consumption of Solar PV energy.
Energy Security, with reduced energy demands, costs and reliance on the grid.
Significantly improved thermal comfort in winter and summer.
Appliances: Heating: 5.5-Star Mains Gas Ducted Central Heating Cooling: 3.5-Star Reverse Cycle Split System (2020 Rating) Hot Water: 5-Star Gas Storage System
Building Fabric: Ceiling Insulation: Calculated R0.5 - Loose Fill Rockwool Wall Insulation: None Floor Insulation: None Window Coverings: 70% With good quality thermal coverings. Draughts: Air leakage to wall vents, doors, windows, skirts and arcs and heater ducts.
Scorecard Ratings: Energy Star Rating: 5.6 Stars (10-Stars) Thermal Rating - Hot Weather: 1 Bar (5 Bars) Thermal Rating - Cold Weather: 2 Bars (5 Bars)
Energy Consumption: Energy Usage: 71073Mj
Appliances: Heating & Cooling: Removed Gas Ducted Heating System. We retained the existing small Reverse Cycle Split System traditionally only used for cooling as the primary heating/cooling system. Enfort specified and then managed the installation of a DC ceiling fan in this zone to help destratify and distribute the heat throughout the house. Hot Water: Enfort specified and then managed the replacement of the Gas Storage Hot Water System with a Heat Pump Hot Water System.
Building Fabric: Ceiling Insulation: Enfort managed the addition of R5.0 of Loose Fill insulation on top of the existing R0.5 of Rockwool. Wall Insulation: Enfort managed the installation of R2.3 Blown into the weatherboard walls. Mainly from the exterior. The property was coming close to requiring re-paining so this worked well. Use of our thermal camera detected some missing areas that the contractor remediated on-site. Floor Insulation: Enfort installed R2.0 Polyester Batts to the underfloor. Window Coverings: Enfort supplied and installed Double-Cell Honeycomb Blinds which were added to any large areas of glazing without any coverings. This included a horizontal sliding honeycomb blind for the back glazed door. Draughts: A Detailed Draught Detection Audit and draught proofing was performed by Enfort. This was applied to:
Sealed heater vent outlets and return air grille.
Skirting boards and architraves.
Chimney brickwork and chimney throat.
Doors and windows.
Wall vents. Renewable Energy: A relatively small 3kW Solar PV System was installed. Due to roof size and shading. Scorecard Ratings: Energy Star Rating: 10 Stars (10-Stars) Thermal Rating - Hot Weather: 3 Bar (5 Bars) Thermal Rating - Cold Weather: 5 Bars (5 Bars)
Energy Consumption: Energy Usage: Negative 10592Mj (With Solar) OR 5687MJ (Without Solar)
Appliances: Heating: 2.5-Star Reverse Cycle Split System (2020 Rating) Cooling: 3.5-Star Reverse Cycle Split System (2020 Rating) Hot Water: Heat Pump Hot Water System
Building Fabric: Ceiling Insulation: Calculated R5.5 - Loose Fill Rockwool PLUS Loose Fill Fibre Wall Insulation: R2.3 Blow-In Retrofit Loose Fill Floor Insulation: R2.0 Polyester Batt Window Coverings: 95% With good quality thermal coverings.
Scorecard Ratings: Energy Star Rating: 10 Stars (10-Stars) Thermal Rating - Hot Weather: 3 Bar (5 Bars) Thermal Rating - Cold Weather: 5 Bars (5 Bars)
Energy Consumption: Energy Usage: Negative 10592Mj (With Solar) OR 5687MJ (Without Solar)
