Thermostat with a big span

I'd like to install a thermostat with a big temperature span so that, for instance I set temperature to 72 in heating mode and the heater doesn't turn on until the room temperature drops below 70. A couple of thermostats I checked have a span of 2 by default and 1 optional. Anybody knows a brand (and model) that has a span of 4 or at least 3? Thanks.