Top Tips for conserving Home Heating Oil

Home heating oil remains a significant household expense in Ireland. While SEAI grants now make heat pumps and insulation upgrades more accessible than ever, many homes will continue using kerosene for years to come. Here’s how to get the most from every litre  and what to plan for next.

Day-to-day savings

1. Set your thermostat wisely

18–20°C is the recommended range for a family home. Dropping the thermostat by just one degree can reduce your heating bill by around 10%. Avoid blasting heat and then turning it off entirely low and steady is far more efficient.

2. Use a smart thermostat

Wi-Fi-enabled thermostats let you control heating remotely and set precise schedules. There’s no benefit in heating an empty house. A SEAI grant of up to €700 is available for heating controls, including smart thermostats and zone controls.

3. Bleed your radiators regularly

Trapped air prevents radiators from heating evenly, making your boiler work harder. Bleed radiators at the start of each heating season. If the bottom of a radiator is warm but the top is cold, it needs bleeding.

4. Don’t block radiators

Long curtains, heavy furniture, decorative radiator covers, and drying clothes on radiators all reduce heat circulation. Keep radiators clear so warm air can move freely around the room.

5. Close doors and zone your heat

Turn off radiators in unoccupied rooms and keep doors closed to retain heat where it’s needed. Zone valves or a programmable system make this easier to manage across a larger home.

6. Seal draughts

Draught-proof doors and windows with weather strips or brush seals. PVC windows should be serviced every few years to maintain their seals. Letter boxes, keyholes, and attic hatches are often overlooked sources of heat loss.

7. Use natural solar gain

Open blinds and curtains on south-facing windows during the day to let winter sun warm the house naturally. Close them at dusk good curtains act as an extra layer of insulation on cold nights.

8. Dress for the season

A warm jumper and thermal socks genuinely reduce how often you reach for the thermostat. Keeping your feet warm is particularly effective if your extremities are comfortable, you’ll feel the ambient temperature as higher than it is.

9. Service your boiler annually

A poorly maintained boiler can waste up to 30% of the heat it generates. Annual servicing keeps efficiency high, extends the life of the unit, and is a condition of most manufacturer warranties. Book before the heating season begins  engineers get very busy from October.

Longer-term: reducing your oil dependency

The measures above help you use less oil. But Ireland’s retrofit programme has never offered more financial support for moving away from fossil fuel heating entirely. SEAI grants substantially increased in early 2026 make insulation and heat pump upgrades significantly more affordable.

10. Insulate your attic

Attic insulation remains one of the most cost-effective home improvements available. A detached house can now receive up to €2,000 from SEAI (increased February 2026), with higher fixed-amount grants available for households on qualifying social welfare payments. One or two rolls of insulation can make a dramatic difference to heat retention.

11. Consider cavity wall insulation

Cavity wall insulation is one of the most effective upgrades for homes built between the 1930s and 1990s. Grants of up to €1,800 are now available for detached houses. If you previously received a grant for wall insulation, from March 2026 you can now apply for a second wall measure to further improve performance.

12. Upgrade your windows and doors

From March 2026, SEAI introduced standalone grants for energy-efficient windows (up to €4,000 for a detached house) and external doors (up to €1,600 for two doors). These were previously only available as part of a full deep retrofit, making them far more accessible for homeowners planning phased upgrades.

13. Plan for a heat pump

If your home is well insulated, a heat pump can replace your oil boiler entirely and dramatically reduce your carbon footprint and running costs. The SEAI heat pump grant increased to up to €12,500 in February 2026 (from €6,500), including a €4,000 Renewable Heat Bonus when replacing a fossil fuel system. Insulation should come first — a heat pump performs poorly in a draughty home.

Key SEAI grant amounts (March 2026)

Heat pump system: up to €12,500 (detached house)

Attic insulation: up to €2,000 (detached house)

Cavity wall insulation: up to €1,800 (detached house)

Windows: up to €4,000 (detached house)  new from March 2026

External doors: up to €1,600 (two doors)  new from March 2026

Heating controls / smart thermostat: up to €700

One Stop Shop deep retrofit (to BER B2+): up to €25,000

Grant amounts vary by dwelling type. Always verify current figures and eligibility at seai.ie before applying. An SEAI-registered contractor must carry out the work, and approval is required before works begin.