We have heated tile floors (electric grid heat) and while it does a nice job heating up the rig, we don't count on them to provide all our heat when it gets cold. There is no question the floor heat reduces the need for your other heating source to be used or reduces the cycles for your other heat source/s. We just set our thermostat to whatever temp we want and let the floor heat and the heat pumps or Aqua Hot run when necessary.
You can definitely feel the heat radiating up from the floors.
2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018.
2019 Grand Designs 384GK-R 5th wheel. Glen Allen, VA