It is not a good idea to have simultaneous schedules and rules acting on the same thermostat.
The reason being, one will take place before the other, and we do not consider the action completed until the thermostat confirms receipt of the event. In that time the second one may try to execute. If the second event is dependent on the first, the second event may not complete.
e.g. Rule: At 10 am on Monday's tell my thermostat to switch on the heat.
Schedule: At 10 am on Monday's tell my thermostat to set the heat point to 75 degrees.
The scheduled event will probably not succeed since the thermostat is not yet in heat mode.