Cost of living in Coimbatore for a family of 4

Hey ! We are a family of 4 currently in Chennai , we are planning to shift to coimbatore due to weather and health issues in Chennai. up on advice of doctors coimbatore and mysore are the option suggested but I'm just curious about the cost of living here in Coimbatore . From what I have heard or read some people says coimbatore is costly than chennai or almost same as chennai. I'm currently in to retail business of housewares so I'm not someone who has to look for job here , I'm gonna start business here Can someone put some light of over all cost of living for a family of 4 , (2 childerns ) mostly going to reside near town hall or sukawarpet.