One thing that I have noticed makes a significant impact on shower use is how warm the bathroom is. Stepping into a cold bathroom that pretty much just stays cold encourages people to use a larger quantity of warmer water. Assuring that the bathroom is already warm enough to be comfortable in while in the buff can significantly cut down on the length of the shower and temperature of the water used.
One really easy solution there is to install a heat lamp if you don't already have one. Even one positioned nearby, outside the shower curtain or glass, can provide a significant boost in how warm it feels. Anybody with a standard ceiling bathroom fan can make this upgrade relatively easily. Make sure that same lamp is also on a timer as well to keep it from getting left on, and to regulate how long you spend in the shower.
It also helps to have a programmable thermostat turn on the heat shortly before people normally use the shower, and if you can ventilate the bath areas more with forced air systems, the baths will also tend to warm up before the rest of the house.
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