How do I choose a professional for central air conditioner?
Choose a properly qualified and insured professional whose written scope identifies diagnosis, permits, parts, labour, exclusions, warranty, cleanup, and total price.
What this means
Central air conditioner covers cooling performance, cycling, outdoor equipment, and condensate. Relevant observations include Runs but the house stays warm, Will not turn on, Starts and stops rapidly, Water is leaking near the indoor unit, Outdoor unit makes a loud noise. The correct response depends on age, design, climate, usage, installation, recent work, and the exact manufacturer instructions; these observations narrow next steps but do not prove a failed part.
Safe checks
- Verify the licence or certification required locally for work on central air conditioner.
- Compare at least two written scopes when the situation is not an emergency.
- Confirm insurance, permits, parts, labour, warranty, exclusions, cleanup, payment schedule, and change-order rules.
Stop and get help if
- Leave for a gas odour or carbon-monoxide alarm; stop for smoke, scorching, damaged wiring, or repeated breaker trips.
- Do not open combustion, refrigerant, high-voltage, or sealed compartments.
Which professional to call
Use a qualified HVAC technician when the condition exceeds safe user access or the visible checks do not explain it.
Find the relevant tradeSource and method
This answer combines HomeSOS's structured triage with safety boundaries supported by a public source. It does not replace inspection.
Health Canada: Home safetyReviewed August 12, 2026