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HeatWave: Smart Window Alerts

HeatWave: Smart Window Alerts

Open windows at the right time

0 ratings
1 review
🔧 Utilities
☀️ Weather
Free
In-App Purchases

Details

  • Released
  • Updated
  • May 28, 2026
  • July 11, 2026

Features

Developer

Christopher Hefferman
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HeatWave: Smart Window Alerts screenshot #1 for iPhone
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iphone
ipad
🧾$2.99 - $14.99
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About

This app monitors outdoor and indoor temperatures to alert you when to open or close your windows for optimal home climate control. It uses your HomePod's sensor and local weather forecasts to provide timely notifications, helping you save energy and stay comfortable without an air conditioner.

✓Real-time indoor/outdoor temperature display
✓Forecast-based opening/closing alerts
✓30-minute advance notifications
✓Home screen widgets
✓Privacy-first, no servers or tracking
✓Multi-language support
Show original description

What's New in HeatWave

1.0.4

July 11, 2026

New: pin the weather to your home The forecast can now stay locked to your house instead of following your phone — so you get the right window advice even when you're out. Set it up during onboarding or in Settings. Plus a refreshed setup flow and design polish throughout. Thanks for using HeatWave!

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In-App Purchases

$2.99

Coffee Money Tip

This will treat me to a coffee

User reviews

Most RecentHighest RatedLowest Rated

Keep Cool - Save Energy

I created a simple shortcut for a similar task but this is a fully fledged professional implementation. I’m really happy with the app. Finally, I’m using technology to do a simple task and it means I don’t need my air conditioning anymore. I can stay cool and save energy using this simple app.
Jonny5AlivJonny5Aliv

Response from developer

Thanks very much for the 5-star review, it’s very much appreciated and I’m pleased you’re enjoying the app and managing to stay cool in this ridiculous heat we’ve been having!

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FAQ

What devices are required to use HeatWave?

HeatWave requires an iPhone running iOS 17 or later. For indoor temperature readings, a HomePod mini or HomePod 2nd generation is necessary. It also utilizes Apple Weather for outdoor forecasts.

How does HeatWave help save energy?

By alerting you to open windows when it's cooler outside and close them before it gets too hot, HeatWave helps maintain a comfortable indoor temperature without relying on energy-intensive air conditioning.

Does HeatWave have ads?

No, HeatWave does not contain advertisements. The app is designed with a privacy-first approach, meaning all data processing happens on your device without servers or tracking.

How often is HeatWave updated?

The app was last updated on July 11, 2026, with version 1.0.4. This indicates a recent update, suggesting ongoing development and support from the developer.

What is the age rating for HeatWave?

HeatWave has an age rating of 4+, making it suitable for a wide range of users. The app's interface and functionality are designed to be straightforward and accessible.

Can I use HeatWave without a HomePod?

While HeatWave can be installed on an iPhone, it requires a HomePod mini or HomePod 2nd generation to access the indoor temperature sensor. Without a HomePod, the app cannot provide its core functionality of comparing indoor and outdoor temperatures.

How does HeatWave compare to other weather apps?

Unlike general weather apps, HeatWave focuses specifically on actionable alerts for window management. It integrates indoor temperature data from your HomePod, offering a unique approach to home climate control.

Is HeatWave available on Android or iPad?

HeatWave is currently supported on iPhone and iPad devices. The app's functionality is tied to iOS features, including Apple Weather and HomePod integration.