Typical cost Furnace repair: $150–$600 per repairTypical cost AC repair: $150–$600 per repairTypical cost New furnace: $4,000–$8,000 installedTypical cost New central AC: $4,500–$9,000 installedTypical cost Tune-up: $90–$200 per systemDes Moines Fall tip Schedule your furnace tune-up now.Des Moines Fall tip Replace your furnace filter.Des Moines Winter tip Keep high-efficiency furnace vents clear of snow.Des Moines Winter tip Change filters every one to three months.Des Moines Spring tip Schedule your AC tune-up before summer.Des Moines Spring tip Clear debris from the outdoor unit.Des Moines Summer tip Keep blinds closed on hot afternoons.Des Moines Summer tip Change filters during heavy use.