--- title: "Designing Luxury Homes with Limited Power: How Geothermal Heat Pumps Reduce Connected Load" date: 2024-12-20T15:26:00+11:00 author: Geoff Pennington canonical_url: "https://sogeo.com.au/blog/geothermal-heat-pumps-in-melbourne-sydney-reduce-connected-load-and-save-on-electrical-upgrades" section: Pages --- ![Shutterstock 2524287887 1]() # Designing Luxury Homes with Limited Power: How Geothermal Heat Pumps Reduce Connected Load How a SóGeo geothermal install for a luxury Melbourne home cuts peak electrical demand by 25 to 50 kW, avoids switchboard upgrades and private substations, and heats your pool for free in summer. ## When a Melbourne switchboard upgrade isn’t enough: the substation conversation For very large luxury Melbourne homes with multiple pools, EV bays, wine cellars, full home automation, and the heating and cooling loads that go with them, a switchboard upgrade may not solve the problem. Once peak demand exceeds what the existing street feed can deliver, the network requires a dedicated padmount transformer or kiosk substation on the property. That is a cost typically between $50,000 and $200,000, plus approvals that can run six to twelve months through the local distribution network. Geothermal collapses the connected load and max demand calculation in three compounding ways that air source cannot match. **1. Higher COP, weather-immune year round.** A SóGeo ground source hydronic system runs at a coefficient of performance of 5 to 7 in every Melbourne season because it rejects heat to ground at a stable 16 to 18°C. Air source heat pumps are rated at mild conditions and degrade in the heat. At a 35°C summer day, typical air source COP drops from a rated 3.5 down to 2.5. On a 40°C extreme day, it can drop below 2. These are the days the air conditioner runs at full capacity, exactly when peak electrical demand is at its highest, and exactly when the network supply is most stressed. A SóGeo geothermal install rejecting heat to the ground at 16 to 18°C is unaffected by the weather. **2. Heat recovery delivers pool, spa, and hot water for free in summer.** When a SóGeo geothermal system cools the home in summer, the heat extracted from the indoor loop is captured and diverted to other thermal loads on the property. The pool heats. The spa heats. The domestic hot water heats. All of it at no additional electricity cost, as a by-product of cooling the home. For a typical Melbourne luxury home with a 50,000 to 100,000 litre pool, this saves $2,000 to $6,000 per year on pool heating alone. Air source heat pumps reject this heat to the outdoor air and waste it. There is no fluid path between an air source condenser and a pool loop, which means an air source setup requires a separate pool heat pump, a separate spa heat pump, and a separate DHW heat pump, each with its own electrical draw. **3. Lower combined peak demand at every load size.** The compound effect of higher COP and heat recovery means a SóGeo geothermal install for a luxury Melbourne home running 50 to 200 kW of total thermal load draws roughly 6 to 25 kW at peak. An equivalent air source combination of house heat pump, pool heat pump, spa heat pump, and DHW heat pump running concurrently on a hot summer day draws closer to 18 to 70 kW at peak, before any further COP degradation in extreme conditions. On a 100 kW luxury install the geothermal advantage at peak is around 25 kW. On a 200 kW estate-level install it is 45 to 50 kW. That 45 to 50 kW saving is often more than the difference between staying on the existing supply and needing a switchboard upgrade or a private padmount substation. SóGeo works with architects and electrical engineers at concept stage to size the geothermal system around the building’s full electrical load budget and the heat-recovery integration. The conversation belongs in the early design phase, before the network application is rejected. For specifier-grade detail on pre-design coordination, see our [hydronic and geothermal pre-design guide for architects and builders](https://sogeo.com.au/architect-builder-guide-hydronic-geothermal). 01 ![SoGeo Team At Work]() ### The Geothermal Advantage Geothermal heat pumps, also known as ground source systems, use stable underground temperatures for efficient heat exchange. The result is: - **COP of 5 to 7** far higher than traditional air-based systems - **50 to 70% lower energy usage** for heating and cooling - **Significantly reduced peak electrical draw** Because they operate steadily and don’t rely on backup elements, geothermal systems help keep your **connected load low and predictable**. This avoids those demand spikes that cause distributor headaches. ### Freeing Up Power for What Matters With less of your site’s electrical capacity going to HVAC, you can preserve it for: - **EV chargers** (7 to 11 kW) - **Extensive wine cooling system** - **Home automation, lighting, and cinemas** Geothermal gives your clients all the luxury, without the electrical upgrade. --- ### Speak with SóGeo If you’re an architect or builder working on a project where power capacity is tight, geothermal could be the key to keeping things moving , and keeping the home high-capacity without compromise. 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