Why windows matter so much
Even good double glazing insulates far worse than an insulated wall. A big or older window can be responsible for a large share of a room’s heat loss — which is why the area near the glass feels cold and why your heating runs harder. A window covering that traps still air against the glass slows that loss down.
Ranked: what actually helps
1. Honeycomb (cellular) blinds — the winner
Cellular shades trap air in rows of closed pockets, and still air is a poor conductor of heat. Nothing else in the blinds world comes close. Double-cell honeycomb roughly doubles the effect again — that’s the pick for the coldest windows. Mount them inside the frame, close to the glass, so the trapped layer is sealed. Read the full honeycomb guide.
2. Lined curtains — a close second, and warmer-feeling
Heavy, thermally lined curtains that hang to the floor and overlap the window generously create a big pocket of still air. They also absorb sound and make a room feel cosy. The details matter: floor length, wide overlap, and ideally a wraparound track so the sides seal. See curtains & drapes.
3. Layer the two — the warmest option of all
A honeycomb blind against the glass with lined curtains in front. Two trapped air layers, maximum comfort, and it looks like a designer did it. This is what we recommend for cold bedrooms and big living-room windows.
4. Roman shades, lined
A lined Roman shade helps meaningfully — more than a roller, less than honeycomb — and looks lovely.
5. Roller and zebra blinds — modest
A single fabric layer with gaps at the sides doesn’t trap much air. Still useful for privacy and glare, and blackout/thermal-backed fabrics help a bit — but if warmth is the goal, choose honeycomb.
The details that make it work
- Fit close to the glass — an inside mount with minimal gaps seals the air layer.
- Close them at dusk — most heat is lost overnight; open on sunny days to catch free solar heat, especially south-facing.
- Side channels on a honeycomb or blackout blind seal the edges — better insulation and darkness.
- Automate it — motorized blinds on a sunset/sunrise schedule do the closing for you.
The most common comment after we install honeycomb blinds in an older Montreal home is some version of “the room just feels warmer.” It’s not imagination — it’s the cold draft off the glass being interrupted.
Frequently asked questions
What are the warmest blinds?
Honeycomb (cellular) blinds — double-cell for the coldest windows — mounted close to the glass. Layer lined curtains over them for maximum effect.
Do blinds really reduce heating bills?
They reduce heat loss through the glass, so your heating runs less to hold the same temperature. The effect is biggest on large, old or north-facing windows, and most noticeable in comfort near the window.
Are curtains warmer than blinds?
Thermally lined, floor-length curtains are very warm — comparable to a good honeycomb blind. Together they beat either alone.
Should blinds be open or closed in winter?
Closed at night and on grey days to hold heat in; open on sunny days (especially south-facing) to let free solar warmth in. A motorized schedule makes this automatic.
Do you install honeycomb blinds in Montreal?
Yes — custom-made and installed free across the island and surroundings.
