Anonymous wrote:45 is fine but it shouldn't take more than an hour to heat up
There are not many homes on the planet that would reach comfortable temperatures in an hour starting at 45 if it is 30 outside.
45 is fine for a vacant house (though pipes in old interior walls could still freeze). Should be turned to at least 60 degrees 24 hours before anyone arrives.
It is not acceptable, to answer OP's question. That is not room temp. But good luck getting any compensation. I have had many good experiences with Airbnb but overall it seems like it's becoming more and more of a gamble every year.