Can I Install Central AC with My Furnace at Different Times?

Published: July 23, 2026 — BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning — Greater Vancouver, BC

Adding AC to Existing Furnace

Yes — you can add central air conditioning to an existing forced-air furnace at any time. The AC evaporator coil installs in the furnace supply plenum, and the outdoor condenser connects via refrigerant lines. The furnace blower distributes the cool air.

Cost Breakdown

Adding AC to an existing furnace costs $3,500-6,500 including: evaporator coil ($500-1,000), condenser unit ($1,500-3,000), line set ($200-400), electrical ($300-600), and labour ($1,000-1,500). No new ductwork is needed if the existing ducts serve all rooms.

Compatibility Considerations

The furnace blower must be capable of moving sufficient airflow for cooling. Variable-speed ECM blowers handle AC best. Older single-speed blowers may work but with less dehumidification. A larger furnace may need a larger coil cabinet — verify fit before purchasing AC.

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Safety Reminder

If you smell gas, suspect carbon monoxide or believe there is an immediate danger, leave the property and contact emergency services or the appropriate gas emergency authority. Do not remain inside — exit the building immediately and call for help from outside.