We have a Great Room that has warm air heating that is supplemented with baseboard heting that we use when it gets very cold up north here. There are three or four baseboard heters (14 to 16' length)controlled by a single thermostat. I want to control the heaters with a manual mechanical timer so so it switches off after the set time (30 min to say 3 hours) has elapsed. I need to have a decent looking switch as this is upsatirs living space. I am not an electrician but can wire a switch. Any help?