Honeycomb Blinds That Hold Back the Heat

A honeycomb gives its best insulation when it sits close to the glass inside the recess, because the air between blind and pane stays still. We measure the reveal width at the top, middle and bottom, take the smallest figure, and check the depth at the handle. Because the stack is so small, honeycombs fit reveals that are too shallow for a Roman blind or a cassette roller.

Where the reveal is out of square, which is common in older Goan houses with plastered laterite openings, a small gap appears on one side. On a light-filtering blind that hardly matters. On a blackout blind it lets in a bright line, so we either fit side channels or move the blind onto the face of the frame with a generous overlap.

In the hot months before the monsoon, the late-afternoon sun strikes west-facing glass at a low angle and heats the pane well into the evening. A flat blind behind that glass warms up and passes heat into the room. A cellular blind adds a buffer: the outer face gets hot, but the trapped air slows that heat before it reaches the room side.

For the largest effect, choose a pale or reflective outer face, a double cell and an inside-recess fit. It will not equal an external awning or a chik outside the window, which stop the sun before it reaches the glass, but among blinds hung indoors it is one of the strongest choices, and it helps an air-conditioned bedroom stay cool for longer once the unit is switched off.

The fabric is rarely the weak point in Goa; the hardware is. The headrail, the lift cords and any metal end caps sit in still, damp air through the monsoon, and close to the sea that air carries salt. We specify coated aluminium headrails, stainless or polymer fittings and enclosed cord paths, so nothing plated is left to rust and stain the pleats.

Houses closed for months are the other risk. Dust and the occasional insect find their way into the cells, and in a sealed humid room that dust holds moisture. Leaving a blind fully lowered over a shut window for the whole monsoon is a recipe for marks along the folds. Raise it, or ask a caretaker to open the room on dry days.

Many Goan homes have a window that faces the lane, the neighbour's balcony or a shared compound, yet is also the room's main source of light. Lowering any ordinary blind solves the privacy problem by making the room dim. A top-down, bottom-up honeycomb lets you drop the top rail to bring sky light in over head height while the lower half stays covered.

At night the picture changes. Light-filtering cells become a glowing panel from outside, and silhouettes can show through when lamps are on. In rooms used after dark, choose a denser fabric or blackout cells for the lower part of the window.

Because the cells are light and hold their own shape, a honeycomb can be guided along wires or side tracks and stay flat across sloping or horizontal glass, where a roller would sag. That makes it a common fabric choice for roof lights over stairs and bathrooms.

Overhead blinds bring their own questions about tensioning, motors and monsoon leaks, so we cover those separately on our skylight blinds page. The short version: specify the cell fabric for heat, and specify the system for the slope and the reach.