How much will it cost to replace a gas heat and electric cooling system? Both units are outdoors and are combined surrounded by one unit. ...

Both units are outdoors and are combined surrounded by one unit. My house size is 1100 sq ft. The heat part of the part is gas and the cooling is electric. How much would it be to replace both? How much to replace just the heat?
Answers:    My dad, the handy-man guy, will guess that it would take $4500 to replace both, but he's not sure.
almost $200 to $500