They lived in the center of muggle London, so their apartment was run entirely on electricity. When they’d first moved in, they’d tried to weave temperature regulation charms into the wards that surrounded the apartment. Unfortunately, they had never quite worked right, often doing the exact opposite of what was needed. After the third instance of returning home to a freezing apartment in the middle of winter, they’d dispelled the charms altogether and relied solely on the muggle heating systems with no cooling system to speak of. 