How do I get hot water to my upstairs showers? It is, at best, luke warm. In the winter time, it's almost cold. PLEASE help!:confused:

I would need to know more about your home but even a very poorly insulated home should not cool off a hot water line to the extent your describe. I think your mixing valve is partially plugged. Are there any other second floor fixture that get good hot water? Describe your shower mixer or valves.