BEDDING GUIDE · 1 NOVEMBER 2026 · BY LAVE STUDIO
Choosing a silk duvet when your heating changes overnight
A bedroom can feel comfortable when you get into bed and quite different by morning. Before choosing a heavier duvet for winter, look at when you feel too warm or too cold, and what your heating is doing at those times.
Check the routine before changing the duvet
For boiler systems, a timer controls when heating runs, a room thermostat responds to temperature, and thermostatic radiator valves help control individual rooms. The Energy Saving Trust’s heating-controls guide explains these different jobs. A radiator dial number is not a universal temperature setting across models.
This matters when choosing bedding: “the heating is on” does not tell you exactly what your bedroom feels like through the night. Check the schedule and controls you already use. The Trust notes that advice differs for heat pumps and electric heating; follow your system’s instructions rather than changing its operation to suit a new duvet.
Try a simple bedroom diary
Before buying, note your experience over a few ordinary nights. This is a practical shopping exercise, not a sleep test. A room thermometer can add context, but no single reading tells you which filling will suit you.
| When | What to record |
|---|---|
| At bedtime | How the room feels, whether the radiator is warm, and the bedding you use. |
| If you wake | Whether you want to remove a layer, add one, or adjust your coverage. |
| In the morning | Whether you still feel comfortable and whether the heating routine has changed. |
Include the removable cover, sleepwear and any blanket in your notes. If you change several things together, it becomes harder to tell what helped. Where practical, compare one bedding change at a time.
Choose filling for the pattern you notice
- Often pushing the duvet away: consider less filling instead of automatically choosing the heaviest winter option.
- Comfortable initially, but wanting more coverage later: consider whether an optional extra bedding layer would suit you before replacing the insert.
- Consistently wanting more substantial bedding: compare a higher filling amount, alongside the room conditions.
Lave’s mulberry silk insert comes in Light at 150 g/m², Medium at 250 g/m² and Warm at 400 g/m². These describe the silk filling per square metre. They are relative options within the range, not tested temperature bands or a promise of comfort throughout the night. Our fill-weight guide explains the quantities.
Keep the cover and the other sleeper in mind
Lave’s long-filament mulberry silk filling sits inside a cotton shell. You add your own removable duvet cover, so include that cover when thinking about how the whole bed feels. A new filling is only one part of the setup.
If two people want different amounts of bedding, separate inserts are worth considering. Each person can choose a filling amount without expecting one shared duvet to suit both preferences. Check the cover dimensions for whichever arrangement you choose; our custom-size measuring guide can help.
Bedding is not a substitute for a comfortable room
Choose the insert around your household’s heating needs. Do not use a heavier duvet as a reason to leave an uncomfortable room unheated. The Energy Saving Trust advises checking the system’s instructions and keeping comfort ahead of energy savings. A duvet choice does not establish a safe heating setting or guarantee lower bills.
If you also notice condensation or damp, investigate the room conditions separately. Silk filling does not dehumidify a bedroom or fix mould. Read our airing and damp-home care guide for that distinction.
Published by Lave Studio, which sells silk duvet inserts. The diary is a shopping aid, not a product performance test or heating-system specification.