It makes sense to switch. PVC is lightweight, stackable, durable, and far better at holding in heat and humidity. At first glance, cutting a screen section into the top of a PVC cage seems harmless, especially if you're reusing dome fixtures from an old glass terrarium. The moment you open the top of a PVC enclosure, though, you remove two of its biggest advantages: stability and environmental control.
Why keepers choose PVC caging
Lightweight: easy to move, clean, and rearrange.
Stackable: solid tops make vertical setups safe and efficient.
Does not rot: PVC won't absorb moisture or warp in humid setups.
Less reflection and more security: solid sides reduce stress for reptiles.
Superior heat and humidity retention: the number one performance advantage.
How screen tops undermine PVC
Glass terrariums rely heavily on screen tops, and a screen top brings the same shortcomings to a PVC cage:
Rapid humidity loss as moisture escapes straight up.
Poor heat retention that forces you to use stronger bulbs and higher wattage.
Environmental instability with hot and cold pockets throughout the enclosure.
A PVC cage with a screen top behaves much more like a glass tank, and loses the efficiency and control PVC is known for.
Glass enclosures still have their place
PVC isn't always the better choice. Glass is still ideal for:
Showpiece displays in living rooms.
Fully naturalistic terrariums with 360° visibility.
Situations where viewing is the priority.
A properly built glass terrarium can look stunning, but it will never match the heat and humidity stability of an enclosed PVC design.
Reuse the hardware you already have
Many keepers add screen tops simply because they already own dome lights. At Cornel's World, we solve this by offering:
Matching canopies that hold existing domes without cutting into the PVC.
Solid tops that keep the thermal performance.
Controlled side ventilation instead of wide-open airflow.
That way, you get the full benefit of PVC without wasting the gear you already own.
When screen sections make sense
Small, intentional screen cutouts are useful for:
High-output UVB fixtures
LED bars that need ventilation
Specific species that need extra airflow
For every front and top option we build, and when a screen top is the right call, see PVC enclosure fronts and tops explained.
Final thoughts
Switching to PVC is one of the biggest upgrades you can make for your reptiles. Cutting in a screen top immediately throws away many of the reasons PVC beats glass.
Keep the top solid, use a canopy if needed, and let your PVC cage do what it does best: deliver a stable, secure, efficient environment for the animals you care about. New to PVC caging? Start with our starter kits.
Ready to upgrade your reptile's enclosure?
Solid-top PVC cages, built in Calgary and shipped flat packed or assembled.
