Get Your Home Summer-Ready: A Checklist
The first hot spell of the year always feels like an ambush, yet it’s the most predictable event on the calendar. The homes that stay cool through it aren’t lucky — they were prepared in spring, when fixing a stuck shutter or planning an airflow path costs nothing. Here’s what to sort out before the heat arrives.
Fix your shading before you need it
The single biggest lever against summer heat is stopping sunlight before it passes the glass. Once it’s through the window, it’s heat you can’t send back out. So in May, while it’s still pleasant:
- Test every shutter and exterior blind. Lubricate, unstick, repair.
- Note which façades get sun at which hours — east in the morning, south midday, west in the late afternoon.
- If a sun-facing window has no exterior shading, decide now what to do about it. Not all shading is equal: outside beats inside, always.
Map your cross-ventilation paths
Night airing only works fast if air can flow through the home, not just into it. Walk through your place and answer one question: which pairs of openings sit on opposite or adjacent façades? Openings on two sides plus a bit of wind gives you cross-ventilation — air exchange many times faster than a single open window.
While you’re at it, check that those windows can actually stay open safely at night: security, rain exposure, insect screens, doors that slam in a draft. A doorstop bought in May saves a 3 a.m. bang in July.
Learn your home’s rhythm
Every building has thermal inertia: indoor temperature follows outdoor temperature with a delay of hours — sometimes more than a day in heavy stone or concrete construction, much less in light timber and plasterboard. That lag decides your strategy. A high-inertia home rewards discipline: kept shut by day and flushed at night, it can ride out several hot days on stored coolness. A lightweight home heats fast but also cools fast, so night airing pays off almost immediately.
You don’t need instruments to learn this. Notice how long your place takes to get hot on the first warm days — that’s the same lag you’ll exploit in the other direction all summer.
The checklist
| Task | Why |
|---|---|
| Shutters and exterior blinds working on every sunny façade | Blocks heat before the glass |
| Cross-ventilation pairs identified, doors wedge-able | Fast night flush |
| Windows can stay open at night (security, screens) | Cooling happens after dark |
| Fans located, cleaned, tested | Moves air when wind won’t |
| Fridge coils dusted, oven plans swapped for cold meals | Fewer indoor heat sources |
| Thermometer (ideally with humidity) in the main room | You can’t manage what you can’t see |
Rehearse the night routine
The summer rhythm is simple: shut and shade during the day, then open everything when the outside air is genuinely cooler — and holds less water — than the inside air. That window usually runs from late evening to early morning, and night airing is where a no-AC home actually gets its coolness back. Run the routine once on the first warm weekend, before it matters. You’ll find the stuck window and the slamming door while the stakes are still low.
Let the app watch for you
The one thing a checklist can’t do is tell you, tonight, the exact hour when outdoor air becomes cooler and drier than yours. Open/Shut watches temperature and absolute humidity for your home and says when to open and when to shut — all summer long. Free, private, no account.