How to Integrate a Heat Pump with an Existing Gas Furnace

Published: July 20, 2026 — BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning — Greater Vancouver, BC

System Components

A dual-fuel system requires: outdoor heat pump, indoor evaporator coil (installed above the furnace), a transition box (if needed for duct connection), a dual-fuel thermostat (Ecobee, Nest, or manufacturer-specific), and a control board that manages the changeover between heat pump and furnace.

Installation Cost

Adding a heat pump to an existing gas furnace costs $6,000-10,000 (heat pump, coil, controls, installation). If the furnace also needs replacement, total cost is $10,000-18,000. CleanBC rebates of $2,000-4,000 apply to the heat pump portion.

Changeover Logic

The thermostat decides which heat source to use based on: outdoor temperature (setpoint), indoor temperature versus setpoint difference (large difference = furnace), and time to recover from setback. Most systems prioritize the heat pump and only use the furnace when needed.

Related Services

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.