Originally posted by mark beiser
4 zone is fine with the correct equipment and controls. Be sure you find a contractor that is experienced with zoning, and absolutely use 2 stage heating and cooling equipment. You don't want to the guine pig for a contractors first 4 zone job, especially not with a mulitstory house.
Kick anyone out the door that wants to do a 4 zone system with single stage equipment.
A Trane XL19i system with the Trane Integrated Zone system, or a Carrier Infinity with the Carrier zoning system would be the only 2 options I would even considder for a 4 zone forced air heating and cooling system.