Light control and room comfort are connected
A window covering changes how sunlight reaches a room. Its position, material and fit can influence glare and comfort, but the glass, frame, ventilation, orientation and room use also matter. A showroom can explain light and movement; it cannot predict an energy bill or a temperature change.
When does the room feel uncomfortable?
For summer overheating, note the glazing receiving direct sun, the time of day and whether the covering is used before the room becomes hot. For winter discomfort, distinguish a draught from cold surfaces or other building issues. A blind is not a repair for a defective window or a substitute for needed insulation.
Discuss the actual system
A close-fitting lined fabric arrangement may behave differently from a lightweight open weave. Shutters and slatted systems also have their own gaps and operating positions. Ask what evidence is available for the proposed product and glazing combination; do not assume one published percentage applies to every window.
Keep useful light and ventilation
The most closed setting is not always the most useful one while the room is occupied. Consider screen glare, retained daylight, access to opening windows and the controls you can easily reach. Required vents must remain usable.
For a conservatory
Roof glazing, side windows and doors may need separate consideration. Read the conservatory heat guide, then ask Gemini about your room. The recommendation should address the opening and your needs, without promising a guaranteed thermal result.