Laws of thermodynamics aren’t going to let most average-insulated houses in my zone get much above 90°F, with outside temp at 40.
My mother in a retirement home kept setting her thermostats at the max (two through-the-wall heat pumps in a 2 bedroom apartment), and it did end up around 90F, but there was only one exterior wall. Electric resistance heating would push it higher but not that much, because the heating capacity is sized for normal heating demand.