What I would buy before a Super El Nino summer in Canada

Trending in Canada tonight: a Calgary heat warning and the bigger story behind it — a Super El Nino forming that meteorologists say could rival 1997-98. Here is the actual kit I would buy in May for a Canadian summer that might break records.

Global News, The New York Times, and The Weather Network all ran versions of the same story in the last week: a powerful El Nino is forming, and historic Super El Nino years have brought droughts, heatwaves, and crop failures across the northern hemisphere. Calgary just clipped its first heat warning of the year. If you live anywhere in Canada south of latitude 55, this is the kit I would assemble now while the portable air conditioner units and tower fans bedroom are still in stock at sensible prices. Once a real heatwave lands, inventory disappears overnight.

Who actually needs this

Anyone living in a Canadian home built before 2010 without central AC. That is most of Toronto east end, half of Montreal Plateau, the older neighborhoods of Vancouver, and almost all of Calgary pre-2000 housing stock. Walls and windows in older Canadian houses were optimized for winter heat retention — exactly wrong for a 33°C July afternoon.

Also anyone who walks to a transit stop, works outside, has small kids or seniors at home, or rents a third-floor walk-up where the heat collects. The biggest mortality factor in heatwaves is not the daytime peak — it is the overnight low when the home does not cool down. If your bedroom stays above 26°C at 3am, you do not sleep, and a week of that wrecks people. The 2021 BC heat dome killed over 600 in roughly that pattern. A bedroom cooling fan is the minimum baseline.

Skip the panic-buying tier if you already have central AC, live above the 60th floor in a modern Toronto condo with high-performance glazing, or live north of Edmonton. The latter still gets hot, but overnight relief is real and an evening cross-draft from a window box fan does most of the work.

What I would actually buy, in order

Order matters because the budget runs out. Buy in this sequence:

• Two box fans, $40 each. A window box fan in the upstairs window blowing out, plus a second on the main floor pulling cool night air in around 9pm. This single trick drops indoor temperature by 4-6°C overnight if you commit to opening and closing windows on a schedule.
• blackout curtains for south and west windows. Solar gain through unshaded windows is the actual reason your apartment hits 31°C by 2pm. A set of thermal blackout curtains in a heavy weave blocks 70-90% of incoming solar load.
• A portable AC for the bedroom only. Do not try to cool the whole house. A 10,000-14,000 BTU portable air conditioner units is enough for a single bedroom. Sleep is non-negotiable in a heatwave.
• A real $40 thermometer with humidity. The indoor humidity meter tells you when to vent and when to seal. The heat-index math matters more than the raw temperature reading.
• A water-bottle setup you will actually use. An insulated water bottle you refill in the morning is the most boring and most effective heatwave purchase you will make.

What I would skip, even though they are marketed for this

Evaporative swamp coolers. They sell hard in Canadian summer aisles. They work in dry-air Calgary in June. They actively make humid Toronto in July worse, because they pump moisture into a room already at 70% humidity. Read the climate map before the marketing copy.

Personal neck fans. Cute Instagram product, marginal real-world cooling, batteries die in three hours. A rechargeable handheld fan is fine for a 20-minute outdoor commute leg, but I would never count on it for indoor relief.

Cooling towels. Lukewarm wet cloth that dries out in 15 minutes. Save the $25 and use a regular cotton towel run under cold tap water.

Wi-fi-enabled smart fans. Adds $80 to the price, fails when your router has a bad day. Save the money and buy a second tower fans bedroom for the room you actually need cool.

Power and grid resilience

The other lesson from the 2021 BC heat dome: when grid demand spikes, power can drop. Many of the deaths happened in homes with cooling that lost power for hours during the peak.

I would add a portable power station of at least 500Wh capacity. Enough to run a box fan for 8 hours overnight, or top up phones for a week. A 1000Wh unit can run a small portable AC for one to two hours during an outage — long enough to bridge most utility events.

Add a battery backup pack for medical devices if anyone in the house uses a CPAP machine. Sleep apnea sufferers without backup power during a 12-hour outage are at real risk. Insurance does not cover the hospital bill if it goes wrong.

What I would do this weekend

Walk the house at 2pm on a sunny Saturday. Touch each south-facing and west-facing window. The hot ones are your priority for thermal blackout curtains. Measure them. Order before June 15. They take 7-10 days to ship.

Pull the box fan out of the basement, dust it, test it. If you do not have one, the window box fan is $40 at any hardware store right now and $90 in late July when the heat hits. Do not wait. The same applies to the cheaper pedestal fan models.

Make a written heatwave plan with the kids. Where everyone sleeps when it is 38°C upstairs, when you open and close windows, what to do if AC quits, who checks on grandma. The plan is half the value of the gear. See our notes on the actual car emergency kit if you are already thinking about heat-season road safety.

What I do not know yet

Whether this El Nino actually peaks at Super status. The climate models say it is likely. The peak does not lock in until late August. The story could turn out to be a hot but unremarkable Canadian summer. That is the optimistic case.

The pessimistic case is 1997-98 redux: roughly $100 billion in global damage, the warmest year on record at the time, droughts across multiple breadbasket regions. Canadian summers in those years saw multiple 35°C-plus stretches in southern Ontario, and several weeks where the overnight low stayed above 22°C.

I am betting on the middle: hotter than average, two or three real heatwave weeks for southern Canada, occasional wildfire smoke from a worse-than-usual fire season. The kit above covers the realistic case and the bad one. If it is a mild summer, the box fan and curtains still see use next year. Nothing on the list is a one-summer wonder.

Do not panic. Do not doom-buy a $4,000 split-system AC. Spend $400 in May on the boring stuff and you will thank yourself in July.