Waste heat and renewable energy integration in buildings

•Pinch method modification overcomes time mismatch for thermal sources and sinks.•Test building: multi-family residential, hydronic floor heating, air conditioning.•Seasonal pinch temperature varies: 27.5 °C (Oct. to May), 47.5 °C (June to Sept.).•Solutions: greywater separation, groundwater, thermal solar, heat pumping, storage.•Economic and energy design analyses for test building; strategies for any building.