My kids all wear socks and runningshoes in the house and they are a pair left at my daycare just for use inside as in never been on any floors but mine. The house is air conditioned and if anything the floors are cooler in summer than they are in the winter. I do it for the safety of toes. We run, kick balls, jump and play in such a way that toes can get stepped on or have things dropped on them. The running shoes just make for less tears all around. In school they must have indoor shoes for the same reasons so they just get used to it. I will allow those silly robeeze slippers that cost twice as much as running shoes if a parent insists but tell them what the shoes are for and by age 2 they must be in runners so we can do all of our games like kicking which yes we play soccer in the house. We jump and need protection for tender foot bones. No body goes to the gym to work out in their sock feet - they wear expensive runners with shock absorbers etc. Just think what a child's feet are going through in the course of a normal day of play. But that is just me. Sandals allowed if the toes are closed in and child must have been walking securely for at least several months ie stable. Crocs ok but again not my favourite.

We have hardwood in the playroom upstairs although there is an area carpet on it but no underpad as I didn't want it raised in such a way there could be tripping on the edges, the kitchen is ceramic, playroom in the basement is carpeted. Running shoes just work for me and no one has complained about it.