Do Blinds Actually Beat Delhi Heat? What Works at 45°C

Every May, the same question arrives: will good blinds actually make the flat cooler? The honest answer is yes — measurably, if the fabric and the habit are right. Here is the mechanism, minus the sales fog.

Where the heat actually gets in

Radiant heat lands on the glass, transfers through, and becomes heat the AC must remove. Blinds work at the first step: a fabric on the glass side absorbs or reflects the solar gain before it joins the room's air. The closer the fabric sits to the glass — inside mount, fully lowered — the better the interception.

Fabric, in heat-fighting order

• Sunscreen weaves: the mesh that filters solar gain while keeping daylight and a view — the specialist for west and south elevations. Openness percentages (1–5%) trade view for interception
• Dim-out and blackout fabrics: stop light and the heat it carries; the bedroom answer, especially with outside mount
• Zebra bands: the daylight arrangement with better-than-nothing heat duty — the generalist for living rooms
• Light-filtering basics: privacy and glare, not a heat strategy

The habit that doubles the effect

A sunscreen blind closed at 1 pm intercepts the day's peak; the same blind opened until 4 pm has already let the worst of it in. Closing the sunny elevation through the afternoon is the free upgrade — automated on a schedule if you motorise (roughly ₹3,000–₹6,500 per window, sunset schedules included).

The one window worth fixing first

Walk the house at 4 pm in May. Whichever room makes you wince — almost always a west or south window — is the one where sunscreen fabric pays back in comfort every single afternoon. A 5×6 ft window in sunscreen runs from ₹3,000 (₹100/sq ft upward by fabric), GST included; the rest of the house can wait a season.

Rates and size examples: 2026 price guide; configure the culprit window on the roller blinds page and watch the price update. For a room that fights back despite good fabric, ask us about the mounting — overlap and side channels do more for an afternoon than any upgrade to the cloth.