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Make the space feel warmer in this order: use available winter sun, stop controllable draughts without blocking required ventilation, insulate the floor where people sit and walk, keep seating away from cold windows and moving air, and check that the heating system is capable of serving the whole connected volume. Curtains, rugs and furniture changes can improve comfort quickly; persistent cold usually indicates heat loss through windows or the building envelope, or heating that is undersized or poorly distributed.
Why an open-plan room can feel cold even when the thermostat looks reasonable
An open-plan living room combines several zones into one air volume. Warm air can drift toward a kitchen, hallway, stairwell or high ceiling instead of staying where people sit. A person may also feel cold because of air movement or cold surrounding surfaces, even when the measured air temperature is acceptable.
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- Cold windows: Glass and frames can be much colder than the room air. A seat beside a large pane can feel chilly because your body loses heat toward that surface and because small air currents fall beside it.
- Cold floors: Tile, concrete and uninsulated timber conduct heat away from feet. A rug or carpet adds a layer between the floor and the room’s occupants.
- Draughts: Gaps around windows, external doors, floors and service openings allow unwanted air movement. The moving air can make a room feel colder than its thermometer reading suggests.
- Uneven heating: A single heater may warm the area immediately around it while leaving a distant seating zone, dining area or passage cold. Furniture can also obstruct warm-air outlets or return-air paths.
These effects are why comfort depends on air movement, temperature distribution and the temperature of surrounding surfaces, not just the thermostat setting. The YourHome heating-and-cooling guidance makes the same distinction when discussing thermal comfort and heater placement.
Start with the changes that cost nothing
- Track the winter sun. On sunny days, open window coverings on the side of the room receiving direct sunlight. Move a tall sofa, bookcase or plant that blocks the glass if it can be relocated safely.
- Close coverings when the sun leaves. Shut curtains once the window is no longer sunlit, rather than waiting until the evening chill has already entered.
- Keep seating out of cold-air paths. Do not place the main sofa directly beside a cold window, at the foot of an exterior door, or where air returns toward a hallway or stairwell.
- Leave heating outlets clear. Keep sofas, storage baskets and long curtains from covering radiators, vents or fan-heater outlets. Maintain the clearances specified by the appliance manufacturer.
- Use the smallest practical heated zone. If your system allows separate zones, heat the occupied living area instead of every connected room. Close an internal door only where doing so does not interfere with ventilation or the intended circulation of the home.
- Reduce unnecessary air exchange. Keep external doors closed and repair a door that does not latch against its seal. Do not tape over permanent vents or intentionally disable mechanical ventilation.
These steps are reversible, so they are suitable for renters and useful before spending money on insulation or a new heater.
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Stop draughts while preserving safe ventilation
First identify the gap rather than sealing every opening. On a windy day, feel around the perimeter of windows, the bottom and latch side of external doors, skirting boards and any service penetrations. A visible strip of daylight, moving curtain edge or cool narrow stream of air is a useful clue. The Australian Government’s insulation and draught-proofing guidance lists windows, doors and floors among common leakage points.
Low-cost measures for doors
- Use a fabric “draught sausage” or fitted door sweep beneath a door with a clear gap. A sweep should contact the threshold without preventing the door from closing or becoming a trip hazard.
- Fit removable self-adhesive sealing strips to a sound door frame. Clean and dry the surface first, and choose a profile that compresses when the door closes.
- Repair a warped door or damaged threshold when the gap is too large for a temporary stopper. A permanent repair may require a landlord or qualified tradesperson.
Low-cost measures for windows and floors
- Replace perished window seals or use a suitable removable sealing product on operable sashes. Do not seal a window shut if it is a required emergency egress route.
- Check skirting-board joints and floor penetrations for obvious gaps. Use a material appropriate to the substrate and movement; an insulation professional can advise on larger or concealed leaks.
- Keep intentional trickle vents, fresh-air inlets and exhaust paths open. They are part of the home’s air-quality strategy, not accidental draughts.
Sealing must not obstruct ventilation needed by unflued gas heaters, combustion appliances or other equipment. If the room contains such an appliance, follow its instructions and local safety requirements before adding seals. The Australian Government guidance also recommends qualified advice for insulation and more extensive draught work.
The Australian Government’s winter guidance states that draught-proofing can save up to 25% of heating bills; that is an agency estimate, not a guaranteed result for an individual home. The same department cites CSIRO 2015 research that sealing may reduce heat loss by 15% to 25%. Actual results depend on the size and location of the gaps, weather, indoor temperature and how the home is heated.
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Use curtains to manage window heat loss
Window coverings work only when they form a reasonably continuous barrier beside the glass. For a living room, choose panels that reach the floor, extend toward the wall at each side and sit close to the window when closed. A pelmet or close-fitting track can reduce the open gap above the fabric. Thermal lining can add resistance, but a poorly fitted curtain can still leak air around its edges.
A winter day-and-night routine
- Open the curtains on the sunny side of the room in the morning or whenever direct winter sun reaches the glass.
- Leave them open while the window is receiving useful sunlight, provided glare and privacy are acceptable.
- Close them as soon as the sun moves away from that window, then keep them closed overnight.
Window performance varies with orientation, frame, glazing and climate. The Australian Government estimates that up to 40% of a home’s heating energy may be lost through windows; treat that as a broad government estimate rather than a prediction for every open-plan room. If replacement is being considered, compare glazing and frame performance with the existing window and the local climate instead of assuming any new window will deliver the same result.
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Put an area rug under the main seating group or along the path where people stand and walk. A dense rug with a suitable underlay is more effective at separating feet from a cold floor than a thin decorative mat. Anchor the edges so they do not curl or slide, especially near a heater or a frequently used doorway.
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Rugs improve contact comfort and add an insulating layer; they do not heat the air. The Australian Government’s winter page says, “Warm rugs and thick carpet can also add a layer of insulation and improve comfort levels.” No quantified reduction in heating bills should be promised from a rug alone. Choose a washable or low-pile option if the room also serves as a dining or kitchen area, and leave required floor vents accessible.
Arrange furniture and heaters for even comfort
Map the open-plan room as a set of comfort zones rather than one rectangle. The sofa, reading chair and dining seats should not all occupy the coldest perimeter. Place the main seating where it receives warmth without being in the direct blast of a fan heater or the return flow toward a hall.
Check the air path
- Stand near each heater while it is operating and observe where warm air travels. A high ceiling, open stair or doorway can carry it away from the seating area.
- Keep the space in front of a radiator or supply vent open. A sofa pushed tight against a radiator can block convection and overheat the furniture while leaving the room cool.
- Do not cover a return-air grille. A blocked return can reduce circulation and create a warm pocket near the heater with colder areas elsewhere.
- For a ceiling fan, use the manufacturer’s winter direction and low speed only if the fan is designed for that function. Stop if it creates a perceptible draught at seated level.
Create practical zones
If the system supports zoning, direct heat to the occupied living area and use a lower setting in little-used connected spaces. Where there is no zoning, a qualified heating technician can assess whether an additional outlet, radiator or duct adjustment would distribute heat more evenly. A small portable heater may make one chair comfortable but is unlikely to heat a large connected volume evenly; never use one as a substitute for correct sizing or safe fixed-system design.
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Compare the main fixes before spending money
| Intervention | What it addresses | Cost and effort | Renter suitability | Important limitation |
|---|---|---|---|---|
| Sun-and-curtain routine | Uses solar gain and reduces night-time window losses | Free; daily habit | Excellent | Depends on orientation, weather and window covering fit |
| Door stopper or sealing strip | Air leakage at a known door gap | Low; usually removable | Usually good with approval where required | Must not block ventilation or create a trip hazard |
| Window seal repair | Perimeter leakage around operable windows | Low to moderate; careful fitting | Possible if removable, otherwise ask the owner | Does not upgrade poor glazing or a cold frame |
| Area rug and underlay | Cold floor and foot-level comfort | Moderate; no building work | Excellent | Comfort measure, not a guaranteed bill saving |
| Thermal-lined, close-fitting curtains | Radiant loss and air movement at windows | Moderate; track or pole installation | Good with permission | Must be opened for useful sun and kept clear of heaters |
| Insulation upgrade | Heat flow through roof, walls or floor | High; building work and assessment | Usually owner-led | Correct specification depends on climate and construction |
| Heating-system redesign | Insufficient capacity or poor distribution | High; professional design | Owner-led | Requires correct sizing, efficiency and safe installation |
When the problem is the building envelope
If the room remains cold after curtains, draught control, floor coverings and furniture changes, inspect the envelope rather than continually increasing the thermostat. Cold ceilings, exterior walls or floors can indicate missing, compressed or wet insulation. Condensation, mould, peeling paint or a persistently cold surface are reasons to investigate moisture and insulation together, not simply to add another heater.
The Australian Government reports that effective insulation may reduce household heating and cooling costs by 45%. This is a government estimate, not a universal prediction; savings depend on the existing insulation, climate, construction, occupancy and heating system. Insulation work can also affect moisture movement and ventilation, so use a qualified installer who understands the local building method.
Questions to ask during an assessment
- Is the roof or ceiling insulated continuously, including edges and access hatches?
- Are exterior walls and suspended floors insulated, and are there thermal bridges around beams, slabs or window reveals?
- Are window seals, glazing and frames suitable for the local climate?
- Will proposed sealing alter required ventilation or the operation of combustion appliances?
- Can the assessor document the work and provide local credentials and warranties?
For major work, obtain more than one written scope. A low quote that omits difficult edges or access areas may not solve the cold surfaces that are causing discomfort.
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When the heating system is the limiting factor
Heating capacity must match the room’s volume, insulation level, window area, climate and desired temperature. An open-plan layout can effectively combine several rooms, so a heater sized for a closed lounge may be undersized once a kitchen, dining area and hallway are opened to it.
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- The heater runs continuously on cold days while the far side of the room never reaches the target temperature.
- The area immediately around the unit is hot, but seats near the perimeter remain cold.
- Temperature varies markedly between floor level, sofa height and the opposite end of the room.
- Closing an internal door makes the room comfortable, showing that the connected volume may exceed the system’s design.
A professional should calculate the heat load and check airflow, controls, filters, ducts and zoning before recommending a larger appliance. Compare options by energy efficiency, correct sizing, installation requirements, noise, maintenance and health considerations. Do not place a portable heater where curtains, rugs, furniture or children can contact it, and follow the appliance’s clearance and electrical instructions.
Use paint and lighting to look warmer, not to claim physical heat
Warm whites, muted ochres, clay tones, timber accents and layered lamps can make a room read as more inviting. They change colour perception and atmosphere; they do not replace insulation, draught control or adequate heating. Test paint samples in morning, afternoon and artificial light because a colour that looks warm on a small card can appear noticeably different across a large open-plan wall.
For a painting project, coordinate the colour plan with the room’s heat strategy: keep curtains able to close fully, avoid placing heavy furnishings over vents, and protect rugs and textiles from splashes and heater clearances. Treat the visual layer as a finishing choice after the physical sources of discomfort have been addressed.
Troubleshoot by the symptom you feel
| Symptom | Likely source | First check | Escalate when |
|---|---|---|---|
| Cold feet but comfortable upper body | Hard or poorly insulated floor | Add a secured rug with underlay; check for floor vents that must remain open | The floor is damp, persistently icy or cold across the entire footprint |
| Chilly seat beside a window | Cold glass, frame or window draught | Move the seat, improve curtain fit and inspect seals | Glass remains markedly colder than other surfaces or seals are failing |
| Moving air at an external door | Threshold or perimeter gap | Fit a suitable sweep or sealing strip | The door is warped, the threshold is damaged or ventilation is affected |
| One end warm, the other cold | Insufficient capacity or blocked/poorly balanced airflow | Clear outlets and returns; check zoning and filters | The system runs continuously without reaching its set point |
| Cold after sealing work | Ventilation reduced or moisture problem exposed | Confirm intentional vents remain open and monitor condensation | There is mould, combustion-appliance risk or worsening indoor air quality |
A practical weekend plan
- Morning: note which windows receive sun, then open those coverings and move one obstruction if safe.
- Midday: walk the perimeter with a hand or tissue to identify moving air; mark the locations instead of sealing blindly.
- Afternoon: reposition the main seating away from cold glass and clear every heater outlet and return grille.
- Evening: close sun-exposed curtains after the light leaves, deploy a door stopper at a confirmed gap and place a secured rug in the seating zone.
- Next cold day: compare comfort at the sofa, dining table and far end of the room. If the pattern has not improved, document temperatures, drafts and heater run time for an assessment.
Australian guidance is the main basis for the savings and window-loss estimates above, with New Zealand Building Performance guidance also describing curtain fit and draught “sausages.” Climate, orientation, construction and heating practice differ by country, so use the figures as context rather than promises. A qualified local energy assessor or insulation installer is the appropriate next step when inexpensive, reversible measures do not solve the cold.
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