Room-by-Room Cooling Checklist for Singapore Homes

Keeping a Singapore flat comfortable without relying on air conditioning is not a single action — it's a set of small decisions applied consistently across each room. This checklist organises those decisions by space. Work through each section and implement what's applicable to your flat type, tenancy situation, and budget. Even half the items on this list, applied consistently, reduce the hours per day when the AC feels necessary.

Bedroom

• Install blackout or thermal curtains on east-facing windows (close before 7am, open after 12:30pm)
• Install blackout or thermal curtains on west-facing windows (close before 12:30pm, open after 7pm)
• Apply solar window film to all sun-facing glass for a permanent base layer of heat rejection
• Set the ceiling fan to run counter-clockwise (when viewed from below) to push air downward
• Use a standing fan directed at the body rather than at the wall
• Place a thick area rug beside the bed to reduce heat radiated from the concrete floor slab at night
• Switch to cotton or bamboo bedding — both conduct body heat away more efficiently than polyester or microfibre
• Pre-cool with AC for 30–45 minutes before sleep, then switch to fan-only. A pre-cooled, well-ventilated room stays comfortable for several hours
• On cool nights (after midnight), run a fan facing outward in the bedroom window and open an inlet in the hallway to flush stored heat out

Living Room

• Clear furniture away from windows — sofas or shelving in front of inlet windows reduce airflow by 30–50%
• Apply solar film to large west-facing windows or glass balcony doors
• Use light-coloured soft furnishings in sun-exposed areas — dark upholstery absorbs and re-radiates heat
• Position a standing fan to create cross-flow toward the kitchen or hallway, not toward the exterior wall
• Open internal doors to the bedroom and kitchen when ventilating to extend the airflow path through the flat
• If the living room has a high-level window or louvre, open it in the evening to let accumulated hot air escape upward (stack effect)
• Avoid running the television, gaming consoles, or other high-power electronics unnecessarily — each generates significant ambient heat

Kitchen

• Keep the ventilation window open at all times while cooking
• Run the range hood at maximum power during cooking and for 15 minutes afterward to exhaust hot, humid air
• Cook during cooler times of day where schedule allows — early morning or after 8pm significantly reduces heat load during peak afternoon hours
• Consider induction cooking instead of gas. Induction generates significantly less ambient heat — most of the energy goes into the pot rather than the surrounding air
• Ensure the refrigerator has at least 10cm clearance on all sides. A poorly ventilated fridge compressor works harder and generates more heat
• Run the washing machine in the evening or at night, not during peak afternoon heat
• Close the kitchen door during cooking if ventilation is already established elsewhere — this contains the heat source

Bathroom

• Run the exhaust fan during and for 10 minutes after showering — trapped steam significantly raises perceived temperature and humidity in adjacent rooms
• Take cooler showers in the afternoon. A hot shower raises both the room temperature and your core body temperature for up to an hour afterward
• If the bathroom has a window, keep it open during the day for passive ventilation — bathrooms are often a warm air source that affects adjacent bedrooms

General Flat-Wide Steps

• Service your AC annually — a clean, serviced unit cools more effectively with less energy. A dirty filter alone can reduce airflow efficiency by 15–25%
• When using AC, set to 25°C (NEA recommended setting). Each degree below 25°C increases energy use by approximately 10%
• Use the AC timer to switch off 1–2 hours after you typically fall asleep — most people enter deep sleep before they need active cooling
• Cool only occupied spaces — close internal doors to concentrate cooled air in the room in use
• Switch to LED lighting throughout — LED bulbs generate a fraction of the heat produced by fluorescent or incandescent alternatives
• Replace or move any large appliance generating heat in a poorly ventilated space (desktop computers, NAS drives, routers) — consider a ventilated enclosure or relocating to a room with better airflow