Questions to ask before approving furnace work

Begin with the problem you actually have

A useful service request describes the symptom, when it began and the equipment involved. No heat, intermittent heat, unusual noise and a planned replacement are different starting points. Give the model information if already available, but do not open unsafe equipment or enter a hazardous area to obtain it.

For this website, the property must be an eligible low-rise Toronto home with an individual furnace. The postal and property checks define the enquiry scope; they do not confirm that a technician is available or that a particular repair is possible. Provider identity, qualifications and timing are confirmed separately.

Separate diagnosis from repair authorization

Ask what the initial visit covers and what it costs. Clarify whether a diagnostic fee is separate from repair labour and parts, whether taxes and travel are included, and how additional work will be presented for approval. Do not assume that requesting a visit authorizes every repair that might be recommended.

After diagnosis, ask the provider to explain the cause identified, the proposed work and any uncertainty. A good explanation should distinguish the observed symptom from the part or condition being addressed. You do not need to perform technical tests yourself to ask why the recommendation fits the findings.

Verify the company and the work category

TSSA provides a registry of authorized fuels contractors. Use it to verify relevant registration rather than relying only on a logo or an advertisement. Registration is not an endorsement of a particular company, and the scope of the work and the person attending still matter.

Ask who is responsible for the job, who will attend, what qualifications are relevant and how you can contact the provider afterward. This website does not publish a verified technician roster or claim that its enquiry contact is itself a licensed contractor. Establish those details before work is authorized.

Compare replacement proposals on the same basis

If replacement is recommended, compare the complete proposed installation rather than only a furnace model or an efficiency number. Ask about sizing, controls, venting, condensate arrangements, access, removal of old equipment and any necessary changes. Different included work can explain different totals.

Confirm manufacturer and installer warranty terms separately, including registration requirements, labour coverage and exclusions. Do not treat a verbal promise as identical to a written warranty. Keep the quote, agreed scope and completion records together so future service starts with reliable information.

Avoid choosing from a single number

Furnace age, a repair estimate and an AFUE rating each provide part of a decision, not the entire answer. Ask how the equipment condition, repair history and suitability for the home affect the recommendation. A generic replacement rule cannot substitute for examining the actual system.

There are no universal installed prices or guaranteed savings on this site. Costs depend on the equipment and the accepted work, and operating costs depend on the home and its use. Compare written proposals and ask for the assumptions behind any savings claim rather than using it as a certainty.

Leave the conversation with an agreed next step

Before the appointment, confirm the arrival window, access instructions and who can approve additional work. Keep children and pets out of the mechanical area and make a safe route available. Do not send security codes in the initial enquiry.

After the visit, request a record of the diagnosis, work completed, parts and relevant operating instructions. If work is deferred, ask what restrictions or precautions apply and what action is needed next. The purpose is a clear, documented decision about the household furnace, not pressure to select the largest proposal.

Primary references

• TSSA: authorized heating fuel contractors
• Natural Resources Canada: furnace EnerGuide ratings

Reviewed October 7, 2026. Equipment-specific instructions take priority.