St. Thomas Air Conditioning

Customer reviews

This business has 3 Google reviews. We show up to five of them below - read the full listing on Google before deciding.

Emmett Brewer

Jul 24, 2025

St.Thomas air conditioning cleaned a mini split for me recently. They were quick, respectful, and performed the job well.

Judith Rehder

Jan 27, 2023

Justin installed a split unit in our apartment. He diagnosed what we needed as we suffered from an inadequate unit. He then installed a beautiful unit and repaired the remaining damage from the old unit. All was done perfectly and at a very reasonable price.

Read all reviews on Google

Before you hire an HVAC contractor in Ontario

Yes for the parts that matter. Gas work requires TSSA certification, and refrigerant work requires a 313A or 313D certificate plus environmental handling certification.

TSSA Gas Technician certificate (G1, G2 or G3)

Legally required for anyone connecting, servicing or venting gas-fired equipment. G2 covers most residential work; G3 is an entry level that must work under supervision.

Verify with: The Technical Standards and Safety Authority regulates fuel safety in Ontario.

Check St. Thomas Air Conditioning on the official register

Certificate of Qualification, 313A or 313D

313A is the full Refrigeration and Air Conditioning Systems Mechanic; 313D is the residential air conditioning equivalent. Both are compulsory trades.

Verify with: Skilled Trades Ontario maintains the public register.

Check St. Thomas Air Conditioning on the official register

ODP / refrigerant handling certification

Required to legally purchase and handle refrigerant. Relevant to any AC or heat pump work.

Manufacturer certification for the equipment being installed

Not a legal requirement, but many manufacturer warranties are only valid when installed by a certified dealer. Ask before assuming you have a ten-year warranty.

Questions worth asking

Will you perform a heat loss and heat gain calculation, and can I see it?
Who on the crew holds the TSSA gas certificate, and at what level?
Is the equipment warranty conditional on registration or on installer certification?
What exactly is covered by your labour warranty, and for how long?
Does this quote include removal and disposal of the old equipment?

Read the full hvac contractors hiring guide