What WindowWise does, when, and why each part is here.
The minimum viable WindowWise is the engine that decides when opening or closing your windows actually saves you money — and tells you exactly that, when it matters.
On a hot day we tell you when the dawn air is colder than your house — that's free cooling waiting to be banked. On a cold day we ping you when the afternoon sun has heated outdoor air above your indoor target. Math handled, you crack a window.
We watch the forecast hour by hour. The instant outdoor temperature is about to cross your indoor temperature, you get a push: close now and the morning's cool stays banked. Wait an hour and it's back outside.
A scheduled push 45 minutes before quiet hours start when the overnight forecast shows a banking opportunity. Crack a window before bed, wake up to a cool house, no 3 AM alerts.
When indoor + outdoor are both comfortable and air quality is good, we'll invite you to open the windows just to enjoy the breeze. Air-quality-aware — silent when AQI climbs above 50.
Walked out the door with windows open on a 95°F day? We alarm — even during quiet hours. The kind of mistake this app exists to catch.
Tell us the indoor temperature you're comfortable at. We do the rest. If you have a smart thermostat, we'll just follow your live setpoint — no separate range to drift apart from reality.
Every adult in the house gets the alerts. Whoever is closest acts. State syncs back to everyone's device. No accounts to create, no emails to enter, no logins.
One device generates a QR. The other scans it. 20-minute invite token, 6-character backup code if you want to text the invite. Done — both devices share the household.
Phones, tablets, computers, multiple parents, kids' iPads — up to 10 devices in a single household. Inactive devices auto-clear after 90 days so a stolen phone or dead computer never blocks new pairings.
Mom closes the windows from her phone, Dad's phone shows "windows closed" within seconds. No more "did you close them?" calls.
Each device keeps its own quiet hours, schedule, and theme — Dad's early-bird schedule doesn't override Mom's night-owl one. The household shares state and location; sleep schedules stay private.
WindowWise works without any of these. Connect them and the recommendations get sharper.
Nest, Ecobee, Honeywell, plus anything paired through Home Assistant or SmartThings. We read your live setpoint so the engine follows your real comfort target — not a separately-configured guess.
Tempest, Ecowitt, NWS NOAA, Open-Meteo — and any sensor you've already exposed via Home Assistant. Microclimate accuracy at your exact home, not the airport reading.
Home Assistant, SmartThings (and HomeKit + Matter on the roadmap). One login, every sensor and thermostat in your ecosystem available to the engine.
On iOS we read directly from the same source as the iPhone Weather app. On Android, macOS, and Windows we route WeatherKit through our backend so every platform shows the same numbers. Open-Meteo is the auto-fallback if WeatherKit is down.
Everything else on this page is free. WindowWise's job — preventing waste, alerting you to act, keeping the family in sync — never sits behind a paywall. Premium adds dashboards and conveniences for the people who want them. One purchase by anyone in your household unlocks it for everyone. No subscription, no renewal.
When the windows open, we pause your smart thermostat's cool/heat. When you close them, we resume. Stops your HVAC from chasing weather you're already letting in.
See what you've banked over time — minutes of free cooling, dollars saved, weekly trends. The dashboard for "is this working?" Answer: yes.
Optional weekly push: "You saved 4h 12m of A/C this week, ~$11.40." A quiet pat on the back.
Premium also unlocks household-wide theme sharing. One family member buys the Coastal Cliff theme; every device in the household sees it.
The engine quietly learns the rhythm of your day — when you wake, when you leave, when you're home, when you sleep — and shapes alerts to fit.
We never wake you mid-night. Banking opportunities that fall during your sleep window get a heads-up nudge before bed, not at 4 AM.
Activity-aware learning quietly figures out your weekday/weekend rhythm. The "open before you leave for work" prompt shows up before your usual departure, not at random.
We track your local outdoor temperature on a rolling two-week median. Phoenix in August and Boston in January get different default comfort suggestions — ASHRAE adaptive-comfort science, not one-size-fits-all.
Windows open and the heater's running? We catch it and tell you. The opposite case (AC running while windows open) too. The most expensive five minutes of every day is when those two things overlap.
A peaceful surface over a precise backend. We looked at every weather app on the market and built the opposite of the loud ones.
The backdrop animates with the time of day, weather, and season. Sunrise behind a coastal cliff in the morning; light rain on the glass in the afternoon; snow drifting past at dusk. 20 hand-tuned variants per theme.
One temperature, big and clear. A short plain-English sentence telling you what to do. No dashboards screaming numbers, no graphs you don't have time to read. Glance once, you know everything.
iOS, Android, macOS, Windows — all four ship together. Phones for alerts on the go, computers for the dashboard at home. Family-shared state stays in sync across every platform.
WindowWise