As of March 2015, full-size heat pump systems cost anywhere from $2,000 to $8,000 dollars including installation. Mini-split-style systems are less expensive, with costs ranging from $2,000 to $7,000 including installation, though the average cost is between $4000 to $5000 dollars.
Prices for heat pumps include installation, assuming adequate air ducts are installed already to allow the pump to function properly. Adding ducts for a full-size heat pump can double or triple costs depending on the complexity of the work required. However, mini-split systems are often designed to eschew ducts entirely, so their installation costs are much less affected by ventilation issues.