Window Film vs Blinds and Curtains: Which Keeps Heat Out?
Window film and blinds both reduce heat, but they work in different places. Window film stops much of the sun’s heat at the glass, so the room stays cooler with the view open. Blinds and curtains only help when they’re closed, and some of the heat they block has already come into the room. For most hot rooms, film does the day-to-day work and blinds or curtains handle night privacy and darkness.
This guide compares window film vs blinds and curtains on heat, light, view, privacy, UV and cost, and explains when it makes sense to use both.
Why it matters where the shade sits
When sunlight passes through glass, it hits floors, furniture and walls inside the room. They warm up and give off heat that can’t get back out through the glass easily. That’s why a sunny room keeps getting hotter through the afternoon.
The best way to stop that heat is before it gets inside. The Australian Government’s Your Home guide says effective shading can block up to 90% of the heat that would otherwise come through a window, and recommends adjustable external blinds for east and west-facing glass.
That gives a simple order of effectiveness for heat:
- External shades and awnings stop the sun before it reaches the glass.
- Window film rejects a large share of the sun’s energy at the glass itself.
- Internal blinds and curtains stop the sun after it has passed through the glass. The blind itself heats up, and that heat stays in the room.
Window film vs blinds and curtains at a glance
| Window film | Internal blinds and curtains | External blinds and awnings | |
|---|---|---|---|
| Heat during the day | Rejects around 40–80% of solar energy, depending on the film | Some reduction, only when closed | Highest reduction, only when lowered |
| View and daylight | Kept, film stays in place all day | Lost when closed | Lost or reduced when lowered |
| Glare | Reduced with the view open | Removed when closed | Removed when lowered |
| UV and fading | More than 99% of UV blocked, all day | Only when closed | Only when lowered |
| Daytime privacy | Yes, with reflective or frosted films | Yes, when closed | Yes, when lowered |
| Night privacy | Only frosted or blackout films | Yes | Yes |
| Winter warmth | Low-E films help hold heat in | Heavy lined curtains help | Little effect once raised |
| Approvals | Strata approval often needed | Rarely needed | Often council or strata approval |
| Maintenance | Gentle cleaning, no moving parts | Dust, cords, motors, fabric wear | Weather, motors, fabric wear |
What window film does well
The biggest advantage of film is that it works with the blinds open. You keep the view, the daylight and the room you paid for, while much of the heat and glare stays outside.
Here’s what Solar Gard’s official figures (6mm clear glass) show:
- TrueVue 15, a dual reflective film, rejects 77% of total solar energy.
- Ceramic CX 50, a low-reflective ceramic film, rejects 48% while letting 50% of the light through.
- LX 70, a near-clear spectrally selective film, rejects 54% while letting 70% of the light through.
Every film we install also blocks more than 99% of UV, which is the main cause of floors, rugs and furniture fading. See whether window tint stops fading and whether window film protects your skin from UV.
Film also has no cords, slats or motors to break, and it doesn’t collect dust. Once it has cured, it just needs the occasional gentle clean.
The limits are worth knowing too. Most films give no privacy at night, when the lights are on inside. They don’t make a room dark enough for sleeping, unless you choose a blackout film. And film reduces heat, but it won’t match a fully closed external blind on a west-facing wall in February.
What blinds and curtains do well
Blinds and curtains still have jobs that film can’t do on its own:
- Night privacy. Closing them is the simplest way to stop people seeing in when the lights are on.
- Darkness. Blockout blinds and lined curtains are the easiest way to make a bedroom or nursery dark.
- Winter insulation. Heavy, lined curtains that sit close to the window and floor help keep heat in on cold nights.
- Style. They’re part of how a room looks.
Their weakness is heat during the day. A closed blind keeps the sun off you, but it doesn’t stop the room heating up. Dark fabrics and metal slats get hot and pass that heat into the room. And when the blinds are closed, you lose the view and the daylight, so the lights often go on in the middle of the day.
What external shades do well
External blinds, awnings, shutters and louvres are the strongest option for heat because the sun never reaches the glass. On west-facing windows they can make a big difference.
The trade-offs are cost, appearance and approvals. External blinds are a bigger investment than film for the same window, can need council or strata approval, have to be raised in strong wind, and block the view when lowered. On high windows, apartments, shopfronts and office buildings, they often aren’t practical at all.
Using film with blinds and curtains
You don’t have to choose one. The most comfortable homes usually combine them:
- Film for the day, curtains for the night. Film cuts heat, glare and UV with the blinds open. Curtains go across after dark for privacy. See which window films give privacy day and night.
- Film plus sheer curtains. A light sheer softens the view from the street during the day while film handles the heat.
- Low-E film plus heavy curtains in winter. Low-E film reflects heat back into the room, and curtains add another layer on cold nights. See whether Low-E film keeps your home warm in winter.
- Blackout film or blockout blinds in bedrooms. For shift workers and nurseries, a fully dark room is the goal, and either can do it.
Which to choose, room by room
- West-facing living area: film first. It’s where the afternoon heat is worst, and it keeps the room usable with the blinds open. See how to stop heat through west-facing windows.
- Bedroom: film for daytime heat, plus blockout blinds or curtains for sleep.
- Street-facing front room: reflective or frosted film for daytime privacy, curtains for the evening.
- Home office: film to cut glare on screens without closing the blinds.
- Rental: blinds may already be there. Removable film is an option with the landlord’s approval. See tinting a rental and landlord approval.
- Apartment: external blinds are often not allowed, so film is usually the practical option, with strata approval. See tinting apartment windows and strata rules.
What about cost?
Professional window film in Sydney generally costs around $100 to $400 per square metre installed, depending on the film, the glass and whether old film needs removing. See how much window tinting costs in Sydney.
Blinds and curtains vary enormously, from cheap ready-made blinds to motorised, made-to-measure systems. External blinds and awnings are usually the most expensive of the three. When comparing, think about what each option does with the blinds open, because that’s how most rooms are used during the day. Our energy savings calculator gives a rough idea of what film could save on cooling.
The bottom line
When it comes to window film vs blinds, film is the better choice for keeping heat, glare and UV out while you still use the room and keep the view. Blinds and curtains are still the best way to get night privacy and a dark bedroom. External shades block the most heat, but cost more and aren’t always possible.
For most Sydney homes, the best answer is film on the sunniest glass and blinds or curtains for the evening. As a Solar Gard Authorised Dealer, we can recommend the right film for each room. See our heat reduction window film, or send your glass sizes through the free quote form.
