Simple Ways to Improve Energy Efficiency

Why Energy Efficiency Is Worth the Effort Now

Every winter, the same conversation comes up in households across the country: the heating goes on, the bills land, and everyone wonders where the money actually went. The good news is that most homes can be made noticeably warmer and cheaper to run without a full renovation. A few well-chosen improvements — insulation, draught-proofing and better heating controls — often pay for themselves within a few years, and they make everyday life more comfortable in the meantime.

If you rent out a property, these upgrades matter for a second reason too. Tenants notice cold, damp-feeling homes very quickly, and a well-insulated, efficiently heated property is easier to let, easier to keep and far less likely to generate complaints about condensation or sky-high bills. Whether you own the place you live in or manage a portfolio of rentals, the principles are the same.

Start With the Roof Over Your Head

Heat rises, and in an uninsulated home a startling amount of it escapes straight through the roof. Loft insulation is one of the simplest, cheapest and most effective measures available, and in many properties it can be installed in a single morning.

The current recommendation for a well-insulated loft is around 270mm of mineral wool, roughly the depth of a standard loft joist plus a good layer on top. If your loft has a thin, dusty layer of insulation from decades ago, topping it up is usually straightforward. If there is nothing there at all, you could be losing a quarter of your heating through the roof.

• Insulate between and then across the joists for the best result, keeping the eaves clear so air can still circulate.
• Insulate and lag any cold water tanks and pipes in the loft — frozen pipes are an expensive nuisance.
• If you use the loft for storage, consider rigid insulation boards or a raised platform rather than squashing soft insulation flat.
• Don't block ventilation gaps at the eaves; trapping moisture in the loft causes damp and rot.

For homes with rooms in the roof, insulation goes between and under the rafters instead. That is a bigger job, but it transforms the warmth of those rooms.

Don't Forget the Walls

Walls are the quiet culprit in many older properties. Cavity wall insulation, where the gap between the inner and outer brickwork is filled with mineral wool or beads, is a proven way to slow heat loss and is often surprisingly affordable. It suits homes built roughly between the 1920s and the 1990s, and a quick check of the brick pattern — or advice from an installer — will confirm whether your property has a suitable cavity.

Solid-walled homes, typically those built before 1920, need a different approach. External wall insulation wraps the outside of the building, while internal insulation adds a layer inside, though it reduces floor space slightly and needs care around damp and ventilation. Both are larger investments, but they can make a dramatic difference to a cold, hard-to-heat house.

While you are thinking about walls, check any exposed pipes and the hot water cylinder too. A simple insulating jacket on the cylinder and foam lagging on pipes keeps heat where it belongs and costs very little.

Seal the Draughts Before You Turn Up the Thermostat

Draught-proofing is the cheap win that so many homes overlook. A cold breeze under a door or around a window can make a room feel several degrees chillier than it really is, tempting you to crank the heating up and waste energy in the process.

• Fit brush or hinged draught excluders to the bottoms of internal and external doors.
• Use self-adhesive foam or rubber seals around window frames and opening casements.
• Fit letterbox brushes and a keyhole cover on the front door.
• Seal gaps around pipework where it enters the house, and around loft hatches and skirting boards.
• Consider a chimney balloon or draught excluder if you have an open fireplace you don't use.

A word of caution: never block ventilation that is needed for a boiler, gas fire or wood burner. Some airflow is essential for safety and to prevent condensation. Seal the draughts, but keep permanent vents clear.

Upgrade Your Heating Controls

Heating controls are where modern technology has moved fastest, and they are often the easiest upgrades to justify. A room thermostat that is twenty years old simply cannot match the efficiency of a modern programmable or smart system.

Set your heating to come on only when it is needed, and turn the thermostat down by one degree — most homes never notice the difference, but it can trim a meaningful slice off the annual bill. Zone your system if you can, so bedrooms and rarely used rooms are not heated to the same level as the living room. Thermostatic radiator valves let you control each room individually, and they are inexpensive to fit.

Bleed your radiators at the start of the heating season, and consider a magnetic filter to keep sludge out of the system. A well-maintained boiler runs more efficiently, so an annual service is money well spent.

Small Habits, Lasting Savings

None of the measures above need to be done all at once. Start with loft insulation and draught-proofing, which are quick and low cost, then move on to walls and controls as budget allows. Together they will make your home warmer on the coldest days, quieter on windy ones and noticeably cheaper to run.

For landlords, it is worth reviewing each property with fresh eyes — a tenant who is comfortable and not worried about bills is a tenant who stays. For homeowners, the reward is simpler still: a house that holds its heat, and a winter that costs less than the last one.