
Looking for the best units in Stirling Horizon that avoid afternoon sun? This comprehensive guide reveals the top energy-efficient units in the February 2025 BTO launch that will keep you cool and save money on electricity bills by avoiding the afternoon sun.
Stirling Horizon Project Overview
Stirling Horizon was introduced in the February 2025 BTO launch, bringing a fresh development to Singapore's housing landscape. This project comprises multiple residential blocks, offering a variety of well-designed units to cater to different family needs.
The development features thoughtfully designed 2-room Flexi, 3-room, and 4-room flats, all classified as Plus flats under the new HDB classification system. With modern amenities and strategic positioning, Stirling Horizon offers residents both comfort and convenience.
Why Avoiding Afternoon Sun is Crucial
In Singapore's tropical climate, the afternoon sun can turn your home into an oven. It leads to:
- 🔥 Unbearably hot bedrooms — even with fans, solar films and curtains
- 💸 Higher aircon bills — often up to 50% more
- 🌙 Walls that radiate heat well into the night
- 🧰 Faster wear and tear on aircon units
For those working from home or children studying, the heat isn't just uncomfortable — it affects focus, well-being, and can cause fatigue or headaches.
Real Stories From Sun-Facing HDB Homes
Don't just take our word for it. These Reddit users shared their real struggles living in sun-facing HDB units:




These real experiences show how harsh afternoon sun can seriously impact comfort, focus, and well-being.
The good news? It's completely avoidable if you choose the right unit.
Demo Sun Analysis Tool
Stirling Horizon: Our Analysis on Which Units Minimize Afternoon Sun
Based on our sun analysis, here are our recommendations for units with minimal afternoon sun exposure:

Best 2 Rm Unit: Block 186B Stack #533
Bedroom will catch direct afternoon sun for a few months of the year but it will be at an angle so the heating would still be controlled. Mid floor units are recommended for optimal sun avoidance.
Best 3 Rm Unit: Block 186B Stack #529
Bedroom will catch direct afternoon sun for some months of the year but it will be at an angle so the heating would still be controlled. Mid floor units are recommended for optimal results.
Best 4 Rm Unit: Block 186A Stack #515
Bedroom will catch direct afternoon sun for some months of the year but it will be at an angle so the heating would still be controlled. Other units like #505 will get direct sun to the master bedroom walls for the full year. Mid floor units are recommended for optimal sun avoidance.
Want to Analyze Specific Units You're Eyeing?
The units above are our top recommendations, but every buyer has different priorities—views, floor level, distance from amenities, or privacy.
BTOs are a major financial commitment, and unlike resale flats, you can't visit them before buying. Whether you're considering our recommendations or have other units in mind, here's how you can make an informed decision:
Option 1: Join Our Beta Waitlist
Get early access to our full sun analysis tool.
Option 2: Do It Yourself
Can't wait for the beta? You can perform your own sun analysis using the Compass Overlay app.
Follow this step-by-step guide to analyze sun exposure for any unit using the Compass Overlay app, available for a one-time purchase of just $4.98 SGD.

Frequently Asked Questions
What makes a unit "best" for avoiding afternoon sun?
The best units are those where main living areas (bedrooms, living room) face away from the afternoon sun. This means avoiding west orientations, though the exact sun path varies throughout the year.
Are there other factors I should consider besides sun direction?
Absolutely! While sun direction is crucial for comfort and energy costs, you should also consider factors like proximity to amenities, floor level, facing direction for views, and privacy from neighboring blocks.
How accurate is the sun analysis?
Our analysis uses precise astronomical calculations to determine sun paths throughout the year, ensuring you get accurate information about sun exposure patterns for each unit.
