Detached homes are just one of the simpler low hanging fruit to fix -- subsidies on insulation and regulation rentals and on new homes -- rather than a huge part of the whole. It's an easy 5-10% depending on area (with side effects of helping the poor and reducing strain on infrastructure during extreme weather events) rather than a large part of the whole.
About half for heating and cooling in EU, https://energy.ec.europa.eu/topics/energy-efficiency/heating... iirc 40% of that or around 20% of total was domestic -- it often looks small because it is broken dowm into two subsets of electricity and two subsets of methane use (and decreasingly kerosene) being for water and space heating. Detached homes use at least double compared to a row house (twice as many walls, but they also tend to be larger and have more windows) or far more than a similarly built apartment with one wall, and tend to be poorly insulated in places like the US.
Heating and cooling represents a lower proportion in the US for a variety of reasons (primarily driving/trucking and some differences in industry as well as a colossally wasteful military), but a huge amount is caused by cows, clearing land for cows, moving cows, cooling cow products, moving feed for cows, and producing fertilizer to grow feed for cows.
Unrelated, but detached home suburb design is also responsible for a lot of other emissions indirectly. Larger living space and fewer communal areas leads to more travel and more stuff. Things being spread out leads to low labour high emissions big box store stuff rather than local hand crafted and second hand markets and local in season produce. Transit and pedestrian hostile layout leads to more driving (and one car per person). Car dependent infrastructure leads to more trucking and less freight trains. Large centralised shopping centers like walmart leads to more uniform goods and just in time logistics which depemd on planes. Flight, trucking, driving and fossil fuel heating leads to more dependence on oil and gas. Oil and gas security is maintained by military activity which is responsible for a huge portion of emissions. None of this stops if you build a 5 over 1 and a train line or a medium density village instead of a suburb of course, but you make a small dent in every step.
About half for heating and cooling in EU, https://energy.ec.europa.eu/topics/energy-efficiency/heating... iirc 40% of that or around 20% of total was domestic -- it often looks small because it is broken dowm into two subsets of electricity and two subsets of methane use (and decreasingly kerosene) being for water and space heating. Detached homes use at least double compared to a row house (twice as many walls, but they also tend to be larger and have more windows) or far more than a similarly built apartment with one wall, and tend to be poorly insulated in places like the US.
Heating and cooling represents a lower proportion in the US for a variety of reasons (primarily driving/trucking and some differences in industry as well as a colossally wasteful military), but a huge amount is caused by cows, clearing land for cows, moving cows, cooling cow products, moving feed for cows, and producing fertilizer to grow feed for cows.
Unrelated, but detached home suburb design is also responsible for a lot of other emissions indirectly. Larger living space and fewer communal areas leads to more travel and more stuff. Things being spread out leads to low labour high emissions big box store stuff rather than local hand crafted and second hand markets and local in season produce. Transit and pedestrian hostile layout leads to more driving (and one car per person). Car dependent infrastructure leads to more trucking and less freight trains. Large centralised shopping centers like walmart leads to more uniform goods and just in time logistics which depemd on planes. Flight, trucking, driving and fossil fuel heating leads to more dependence on oil and gas. Oil and gas security is maintained by military activity which is responsible for a huge portion of emissions. None of this stops if you build a 5 over 1 and a train line or a medium density village instead of a suburb of course, but you make a small dent in every step.