Answer by  
                                                                                          jr22 (59)
                                                            
                          
                          
                                                           The approximate cost of a split system is $5,000. 00 if using existing duct lines, If upgrading to
 a bigger system the cost would now be anywhere from $8,000. 00 to $10,000. 00. Lastly, the high 
 efficiency units usually will cost an extra $1,000. 00 to $3,000. 00 more.