Energy Efficient Home Case Study

Energy efficient home case study, featuring heat pump heating and cooling, aircon and heat pump hot water

Project Summary:

This case study looks at a Port Melbourne renovation that transformed an 80 year old period home into a larger, energy efficient home. Importantly, it kept its original character. The build added a second storey, natural light, thermal mass and north facing windows for efficiency and comfort. New heating, cooling and hot water equipment also helped to make this home energy efficient including:

  • Stiebel Eltron heat pump for underfloor heating and reverse cycle cooling on ground floor
  • Ceiling fans assisting underfloor cooling in summer on the ground floor
  • Wall thermostat monitoring both temperature and humidity
  • LG multi-split air conditioning for cooling on the renovated first floor
  • Room zoning so the whole house does not need to be heated or cooled
  • Aircon cooling on the first floor falls down the stairway assisting the hydronic cooling below
  • The polished finishing screed over the concrete slab makes an attractive finished floor
  • Water heating by a separate low powered Stiebel Eltron heat pump (just 550 watts)

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Other points:

  • The hydronic heat pump sends tempered water to the underfloor circuits. This makes the floor feel comfortably warm at 26 deg in winter and cool at 18 deg in summer.
  • Concrete is conductive so moderately heating the floor in winter and cooling it in summer is important for both comfort and energy efficiency.
  • The heat pump sends hot untempered water at 60 deg to the radiators.  This includes the hydronic towel rail and space-saving fan coil convectors installed inside kickboards.
  • Insulation panels installed under the hydronic circuits prevent heat loss to the slab.
  • Radiators, in reverse cycle, cool by absorbing heat helped by ceiling fans.
  • Aircon on the first floor provides a boost for the hydronic heating or cooling when required.
  • Ceiling fans make us feel about 4 deg cooler, so less aircon and lower operating cost.
Energy efficient home, in-screed circuits