Key Takeaway
Never allow direct sunlight on a glass door — only filtered/secondary sunlight is safe. Solid doors can tolerate direct sun, though minimising exposure where possible will extend the unit's expected life. For alfresco, shade placement is more important than glass type. LOW E glass helps with heat and humidity, but this is location dependent — check your local humidity to confirm the best door config. Always check IP ratings for any outdoor install — and remember that most fridges have never been officially tested. When in doubt, ask us about your specific installation.
Sunlight, LOW E Glass & IP Ratings
These three topics are closely related to alfresco fridge placement and are often overlooked until after installation — when problems are already happening. Understanding sunlight exposure, glass heat protection, and water ingress ratings before you choose your fridge and decide on placement can save you a very expensive mistake.
This page covers how sunlight affects fridges, how LOW E glass reduces heat gain, and what IP ratings actually mean — including why most fridges on the market have never been properly tested.
Sunlight Exposure Guide — What's Safe?
A glass door fridge must never be in direct sunlight — only filtered/secondary sunlight is acceptable (see below). The fridge will overheat, the compressor will fail prematurely, and the contents will not stay cold. This applies regardless of glass type — even LOW E glass cannot overcome direct sun.
Solid door units can be installed in direct sunlight — it isn't the install-blocker it is for glass. Where possible, minimise direct sun exposure to extend the unit's expected life. A real-world example: a Rhino solid door unit installed in Perth WA under a pergola since 2015, facing North with the sun passing over it, still running fine.
Secondary sunlight means light filtered through a UV blind, tinted roof sheet (like Laser Lite), shade sail, or similar. This is less intense and a fridge can usually handle an hour or two of this exposure. However, always consult before installation — the angle of the sun, the percentage UV transmission of the cover, and the ambient temperature all matter.
A fully shaded undercover area where no direct or indirect sunlight reaches the fridge is ideal. Indoor installations away from windows are also fine. This is where glass door fridges perform at their best.
LOW E Glass — How It Works
A microscopic metal coating reflects heat while letting light pass through.
LOW E (Low Emissivity) glass has a specially formulated permanent transparent coating that reflects long-wave infrared energy (heat radiation from the sun, lighting, and ambient heat). This does two things:
1. Keeps heat out — reduces heat gain through the glass, so the fridge works less hard and uses less energy.
2. Keeps the outer glass warmer — by reducing cold transfer from the inside to the outer glass surface, it raises the outer pane temperature, which significantly delays condensation in humid conditions.
| Glass Type | U Value (W/m²K)* | Heat Loss |
|---|---|---|
| Standard glass doors | 2.6 | Baseline |
| LOW E glass doors | 1.6 | −38% vs standard |
*U values based on EN 673, 6mm glass with 12mm argon cavity. Lower = better insulation.
The U-value is 38% lower than standard glass. Since around 70% of a glass door cooler's total energy loss passes through the glass, this translates to approximately 27% less total energy loss overall (38% × 70% ≈ 27%).
IP Ratings — Ingress Protection Explained
IP (Ingress Protection) is a universal international standard measuring how well a product is sealed against solid particles (dust) and water. The rating appears as two digits, e.g. IP55 — the first digit is solid protection (0–6, or X if untested), the second is water protection (1–8).
Important: If you see a rating like X3, the X means the solid particle rating has not been declared — only the water ingress level was rated. A full rating requires two tested digits.
First Digit — Solids
Second Digit — Water
Indoor installations away from direct window sunlight are straightforward. As long as the fridge is not in a position where afternoon sun shines directly on the glass door, you won't have temperature issues from sunlight.
The main considerations for indoor installs are noise level (especially bedroom-adjacent spaces) and condensation if you're in a tropical climate.
A covered alfresco with a solid roof (timber, Colorbond, etc.) is the most common alfresco fridge installation. If the fridge is positioned so that the sun angle doesn't reach it at any time of day — including low winter or morning sun — it can work very well.
Key checks for covered alfresco placement:
- Does morning sun (lower angle) reach the fridge face at any time of year?
- Does afternoon western sun penetrate the opening at low angles?
- Is the area open on multiple sides? (More wind = more heat in summer)
- Is rain likely to reach the fridge in heavy weather?
For glass door fridges in covered alfresco, LOW E glass is a solid choice for humidity performance — but this is location dependent, so check your local humidity levels to confirm the best door config (heated glass, LOW E, etc.) for your site. For solid door units, a model with an IP rating is recommended if rain could reach it.
Fully open alfresco areas with large openings or minimal overhead cover present the most challenging conditions. Glass door fridges can work in these environments if carefully positioned, but it requires planning.
For a real example: one of our glass door installations is in a fully open alfresco with large openings on multiple sides. The fridge is positioned so that the only sun it receives is filtered through a large tinted UV window — no direct sunlight ever reaches the glass door directly. In heavy rain, the fridge could potentially get splashed — so an adequate IP rating is essential.
For glass door fridges in open alfresco:
- Map the sun path at all times of year — include low winter and morning angles
- Ensure glass gets no direct sun — only filtered/secondary sun at most
- Choose LOW E glass for humidity performance — location dependent, so check your local humidity to confirm the best door config
- Verify the IP rating for water resistance
A solid stainless steel door naturally reflects more sunlight and conducts heat into the cabinet far less than a large glass pane. Unlike glass, direct sunlight is not an install-blocker for solid door units — where possible, minimise exposure to extend the unit's expected life, but it isn't a hard rule.
The Rhino ENVY range is available with a solid door option and a certified IP rating, making it our recommendation for any outdoor placement where sun exposure is unavoidable, rain exposure is possible, or placement doesn't allow perfect shade control. Note: the Rhino GSP range is glass door only, so it keeps the same "no direct sun" rule as any other glass fridge.