The short answer
A gas furnace heats air and distributes it through ducts. A useful replacement assessment considers the building, duct system and installation conditions together, rather than copying the old furnace size.
Start with the symptom, not a replacement quote
Record which rooms are uncomfortable, when the problem occurs and whether there are fault messages or unusual operating sounds. Bring the service history and a photograph of the accessible model label. Ask for a diagnosis that separates the immediate fault from optional upgrades. Avoid repeated resets or opening safety covers to investigate a fault.
What belongs in a replacement assessment?
Ask the contractor to explain the proposed heating capacity, return-air arrangement, filtration, venting and condensate provisions for the selected model. Include planned window, insulation or suite changes in the conversation. A quote should identify equipment, removal, commissioning and responsibility for related electrical or gas work.
Compare the alternatives before committing
A home with ducts may also be a candidate for a ducted heat pump or a dual-fuel arrangement. Request comparable scopes: the same rooms, comfort objectives and installation assumptions. Compare ongoing costs using your actual bills and current utility rates; a high efficiency label alone does not predict your bill.
Lower Mainland property details
For a Vancouver renovation, describe limited equipment-room access. For a Surrey or Langley home with a suite, explain who controls the thermostat and which rooms the system serves. In a strata, confirm whether the equipment or vent route involves common property. These details shape the assessment; they do not establish approval.
Prepare for your assessment
- Current furnace label and service records
- Cold rooms and thermostat location
- Duct, vent and equipment-room access
- Planned renovations and approval contact
Common questions
Should the new furnace have the same capacity as the old one?
Not automatically. Ask for a sizing assessment that considers the current building and any planned changes.
Can a gas furnace work with a heat pump?
Some systems can form a coordinated dual-fuel arrangement. Compatibility and controls must be assessed for the exact equipment.
Continue planning
Sources & further reading
Speak with Robert Hamilton at BeeWarm about your property and confirm availability, qualifications and the accepted scope. Find your Lower Mainland service area.
Published October 8, 2026 by BeeWarm. General planning guidance, not an installation procedure. Exact requirements depend on the equipment, property and authority.