How much does electricity used by running a treadmill for an hour for a month cost? My apartment eletric cost kw: 7 baht

Peanuts. The motor will be a few hundred watts - look at the plate on the back - and that, multiplied by 7, is the cost per hour. So, 300 watt motor = 7/0.3 = 2.1 baht an hour. The heat might also cause the air con to work a bit harder, though. 

Thanks alot )