An HVAC system costs $3 to $6 per square foot, including a new furnace and AC unit installation. Replacing an HVAC system for a 2,000 square foot house costs $6,000 to $12,000. Residential HVAC unit cost per ton HVAC unit prices are $1,000 to $6,000 for the system alone. An average 3-ton HVAC unit costs $1,700 to $5,000.
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