Should I install a 240V outlet for a window AC in NB?

For a window AC unit, a dedicated 240V outlet is almost certainly overkill — most window ACs run on standard 120V power and don't need a special circuit at all.

Window air conditioners are designed to plug into a regular 15A or 20A household outlet. The vast majority of units sold in Canada — even larger ones cooling 500–1,000 sq ft — operate on 120V. You'd only need a 240V circuit for very large commercial-grade window units (typically 18,000+ BTU), and even then, it's uncommon in residential settings. Before planning any electrical work, check the nameplate on your unit or the product specifications — it will clearly state the voltage and amperage requirements.

What you actually need to think about is whether your existing outlet can handle the load. A large window AC (10,000–15,000 BTU) can draw 10–15 amps on a 120V circuit. If that outlet is shared with other loads — a bedroom with lamps, a TV, a phone charger — you may trip breakers regularly. In that case, a dedicated 15A or 20A circuit for the AC makes sense, even if it's still 120V. This is a much simpler and less expensive project than running a 240V circuit.

From a TSANB and Canadian Electrical Code perspective, adding a new dedicated circuit does require a permit in New Brunswick, even if it's just a 120V outlet. A licensed electrician would pull the permit, run the circuit from your panel, install the appropriate outlet, and arrange the TSANB inspection. For a straightforward dedicated 120V circuit, you're typically looking at $300–$600 in the New Brunswick market. A 240V circuit would cost more — $400–$800+ depending on panel location and distance — so it's worth confirming you actually need it before going that route.

The one scenario where 240V makes sense is if you're planning ahead for a future mini-split heat pump. Mini-splits are extremely popular in NB given our heating costs, and they run on 240V. If you're thinking long-term, it might be worth having an electrician assess whether installing a 240V circuit now (and using a window AC temporarily) makes sense for your situation.

For safety, never use an extension cord with a window AC unit — it's a fire hazard and violates the Canadian Electrical Code. The unit should plug directly into a wall outlet rated for its amperage.

If you'd like help finding a licensed NB electrician to assess your panel and run the right circuit for your setup, New Brunswick Electrical can match you with a local electrician for free.