by 
Heating a poorly insulated home is a bit like trying to fill a leaky bucket. You can run the heater all evening and still feel a chill, because warm air is escaping through gaps and poorly insulated surfaces almost as fast as you are creating it. The good news is that a lot of the biggest heat losses in a typical home can be reduced with low-cost fixes, well before you need to consider a full insulation upgrade.
Where homes actually lose heat
Before spending anything, it helps to know where the losses are coming from. In most homes, the biggest and cheapest-to-fix losses are draughts around doors, windows and gaps in the building envelope, followed by heat escaping through uninsulated or under-insulated ceilings, and then heat lost through single-glazed windows and floors. A full ceiling or wall insulation upgrade is often the most effective long-term fix, but it is also the most expensive, so it makes sense to start with the cheaper draught and window fixes first and see how much difference they make on their own.
Cheap fixes that make a real difference
Seal draughts around doors and windows
Draught-proofing is usually the single cheapest, highest-return fix available. Self-adhesive foam or rubber draught seals for door and window frames cost very little and can be fitted in an afternoon with no special tools. A door snake (or a rolled towel) along the bottom of external doors is a free, quick way to block one of the most common draught points overnight. Check for gaps around window frames, skirting boards, and where pipes or cables pass through external walls, since even small gaps add up.
Use heavy curtains, and close them properly
Thick, floor-length curtains, especially ones with a thermal or blockout lining, add a genuine layer of insulation over a window. The trick that makes the biggest difference is closing them as soon as it gets dark, and choosing curtains that extend past the window frame on both sides and pool slightly on the floor or sill, since gaps at the edges let warm air slip behind the fabric and cool against the glass.
Add rugs over hard flooring
Floors, particularly floorboards or tiles over an open subfloor, can be a significant source of heat loss and cold underfoot. A rug in living areas and bedrooms is a low-cost way to add a layer of insulation and noticeably reduce that cold-floor feeling in winter.
Block unused fireplaces and vents
An open, unused fireplace can act like a permanently open window, pulling warm air straight up the chimney. A fitted chimney balloon or draught excluder (removed again before the fireplace is next used) can noticeably cut heat loss in homes with a disused fireplace. Similarly, check that any unused exhaust fans or vents are not left open to the outside.
Use door snakes and gap fillers on interior doors too
Closing doors to unused rooms, and sealing gaps under those doors, stops you paying to heat rooms you are not using and helps keep the heated part of the house warmer for less energy.
Check window and door seals are actually working
An easy way to find draughts is to run a hand slowly around window and door frames on a cold, windy day, or to hold a lit incense stick near the frame and watch where the smoke moves sideways rather than rising straight up. Both are free ways to identify exactly where to focus your sealing effort rather than guessing.
Slightly bigger, still budget-friendly upgrades
If the free and low-cost fixes above have helped but there is clearly more heat loss to deal with, a few mid-range options are worth considering before a full insulation retrofit:
- Reflective or thermal window film, applied directly to glass, can reduce heat loss through windows at a fraction of the cost of double glazing.
- Ceiling insulation top-ups, where existing insulation has thinned, compressed or shifted over time, can sometimes be addressed without a full reinsulation job. This is genuinely a job to have assessed by an insulation professional rather than attempting yourself, since roof cavities involve safety risks around structural stability, electrical wiring and, in older homes, materials that should not be disturbed without proper assessment.
- Weatherstripping garage doors and roller doors, which are often overlooked but can be a significant draught source if the garage adjoins living space.
A word on ceiling and wall insulation
Full ceiling and wall insulation typically offers the biggest single improvement in a home’s ability to hold heat, and various state and federal energy efficiency programs periodically offer rebates for insulation upgrades, so it is worth checking current government energy saving schemes before committing to a full retrofit at full price. This is not, however, a DIY roof job: assessing existing insulation, working safely in a roof cavity, and installing new insulation correctly (including maintaining safety clearances around downlights and other heat sources) is best left to a licensed insulation installer.
Getting the most from what you already have
Cheap insulation fixes work best alongside sensible heating habits: heating only the rooms you are using, keeping doors to unused rooms closed, and closing curtains before the house starts to cool in the evening rather than after. None of these changes cost much, but done together they can make a genuinely noticeable difference to how a home holds warmth through winter, and to the heating bill that comes with it.
Join The Discussion