If you are weighing aluminium vs PVC windows for a home or commercial building near the coast, the local climate should be a deciding factor, not an afterthought. North Cyprus and the Famagusta coastline share a demanding combination: long, hot and sunny summers, intense UV exposure, salt-laden sea air, occasional strong wind, and a wetter winter season with humidity and condensation. These conditions test the two materials in different ways. This guide compares aluminium and PVC windows specifically for hot, salty coastal conditions, covering durability, thermal performance, deformation risk, maintenance and appearance.
How each material behaves in heat and sun
PVC is a polymer, and polymers expand and contract more than metal as temperatures rise and fall. On dark-coloured PVC frames exposed to direct sun for long hours, this movement is more noticeable over time and can gradually affect sash-to-frame fit and seal performance. Aluminium, being a metal, has a lower coefficient of thermal expansion and generally keeps its dimensional stability better under high heat. This matters most on large window and door openings, where a frame that resists bending, sagging or warping over years of sun exposure is a real advantage.
The trade-off is that aluminium conducts heat faster than PVC on its own. This is why projects that need strong thermal performance use thermally broken (insulated) aluminium systems rather than bare aluminium frames — a topic we cover in a separate article.
Resistance to salt air near the sea
Corrosion is the most overlooked factor for coastal properties. Salt-laden air can oxidise unprotected metal surfaces over time and cause pitting on coatings that are not suited to marine exposure. Aluminium naturally forms a thin oxide layer that protects the metal underneath, and this protection is reinforced with anodising or electrostatic powder coating. With the right alloy (the 6063 series is a common structural choice in window and door framing) and an appropriate coating, aluminium performs well against salty sea air. That said, the hardware — screws, hinges, locks — must also be specified for coastal use; the weak point is often the hardware, not the profile itself.
PVC is inherently immune to corrosion because it is not a metal, so it will not oxidise or pit from salt exposure. However, PVC sashes rely on internal steel reinforcement to add rigidity, particularly on larger panels, and if moisture reaches that reinforcement through gaskets or joints over time, it can become an indirect risk. So rather than saying "PVC never corrodes," it is more accurate to say its visible surface resists corrosion well, but the internal reinforcement detail still deserves attention.
Comparing thermal performance
Comparing bare aluminium to PVC, PVC has lower thermal conductivity on its own. But that comparison is incomplete today, because modern aluminium window systems place a low-conductivity thermal break between the inner and outer profile faces. Once you compare PVC against a properly specified thermally broken aluminium system, the gap narrows significantly, and the real-world outcome depends just as much on the glazing package (double glazing, Low-E coating, spacer detail) and the frame-to-wall installation detail as it does on the frame material. No profile alone guarantees thermal performance without the right glass and correct installation.
Frame lifespan, colour fading and deformation
A long, sunny season means intense UV exposure. PVC surfaces, especially in dark colours, can dull or shift slightly in colour over the years under sustained UV. Anodised or powder-coated aluminium finishes are generally considered more UV-resistant than PVC and tend to hold their colour longer. On deformation, aluminium's lower expansion coefficient is again an advantage on large sliding and lift-and-slide panels; PVC needs steel reinforcement at larger sizes, which also adds to sash weight.
Maintenance requirements
Both materials need regular cleaning, but the routine differs. PVC surfaces clean easily with neutral cleaning products and never need repainting. Aluminium surfaces stay protected long-term through anodising or powder coating; in a coastal area, periodically rinsing salt and dust off the surface is worthwhile. Tracks, rollers and gaskets on sliding and lift-and-slide systems need their own regular maintenance regardless of frame material — a topic we cover separately.
Appearance and frame slimness
Aluminium's structural strength allows slimmer profile sections for the same size of glazed opening, which supports the sleek, minimal look many modern homes want and helps maximise glass area on villas and residences with large openings. PVC frames tend to need bulkier sections to meet structural requirements, which can mean less visible glass relative to frame. Both materials offer a wide range of finishes, including RAL colours and wood-effect finishes.
Which one fits your project?
Rather than a blanket rule, weigh these points against your specific project:
- If large glazed openings, slim sightlines and a modern look are the priority, aluminium is generally the stronger fit.
- If thermal insulation is the top budget priority and a bulkier frame section is acceptable, PVC is worth evaluating — though thermally broken aluminium narrows that gap.
- Close to the shoreline, where wind and salt exposure are higher, aluminium's dimensional stability is an advantage for large sliding or lift-and-slide panels.
- For commercial and industrial buildings needing high strength and large spans, aluminium is typically the more practical solution.
The most reliable way to decide is to have your building's orientation, wind exposure and sun path assessed on site, so we recommend arranging a survey before finalising your choice.
Frequently asked questions
Does aluminium corrode in salty sea air?
Aluminium does not rust the way steel does; its natural oxide layer plus anodising or powder coating add further protection against corrosion. With the right alloy and coating it performs well in coastal use, but hardware quality (screws, hinges, locks) matters just as much as the profile.
Does PVC deform in hot climates?
PVC expands and contracts more than aluminium with temperature swings. Large, dark-coloured PVC sashes exposed to long direct sun can show slight movement over time; profile quality and internal steel reinforcement reduce this risk.
Which material insulates better?
Bare aluminium conducts heat faster than PVC, but a thermally broken aluminium system closes most of that gap. Actual performance depends on the profile type, the glazing package and correct installation working together.
Which requires less maintenance?
PVC generally needs only simple cleaning and no repainting. Aluminium stays durable with quality coating and benefits from periodic rinsing in coastal areas. Both systems also need regular track, gasket and hardware maintenance.
Which is better for large glazed openings?
Aluminium's higher structural strength allows slimmer frames for the same opening size, which is why it is the more common choice for large glass façades on modern homes.
The right choice depends on your building's orientation, sun and wind exposure, and budget priorities. Browse our systems to see what fits your project, or get in touch to arrange a site survey and measurement visit.
