Heating · Top 10
If you have one free hour tonight, do not start with the energy bill. Check the things that could become dangerous first, then the problems that could leave you without heat on a cold day, and only then move on to efficiency settings.
A boiler, heat pump, air conditioner, radiator system and portable heater all have different maintenance needs and risks. If a check does not apply to your system, skip it.
How this Top 10 is orderedCould this create a risk to people or a fire risk? That comes first.Could a small problem now turn into a heating failure on a cold day? That comes second.Could a setting or minor correction reduce avoidable heat loss? That comes after safety and reliability.There is no opaque points score or formula-driven winner. The reason behind each position matters more than the number.The order is intentional: safety → reliability → efficiency.
10 checks before the season1. Check the heating appliance and the route for combustion gasesHighest priority for fuel-burning heating. Look for visible damage, unusual smells, soot, poor draught or an obviously blocked opening. Do not dismantle gas fittings, burners, flues or electrical components unless you are qualified to do that work.You can do: a visual check for obvious problems and clear access around the appliance. Call a technician: for unusual operation or smells, signs of combustion problems, a flue/chimney concern, or whenever the manufacturer requires servicing. 2. Check smoke alarms and carbon-monoxide detectors if your home has themTest them according to the manufacturer's instructions and check for error or low-battery indications. Follow the device instructions and requirements that apply where you live rather than inventing a universal placement rule. 3. Move combustible items away from heatersA cardboard box, blanket, drying rack or furniture moved during summer may now be too close to a heater. For a portable electric heater, also inspect the power lead, stability and the instructions for that model. 4. Check the filter and airflow — if your system has a filterThis matters for air conditioners, heat pumps and other systems that depend on airflow. A dirty or clogged filter can restrict airflow and increase system workload. Clean or replace it only as the manufacturer directs. 5. Look at accessible vents, ducts and grillesMake sure visible grilles and openings are not blocked by furniture, textiles or stored items. With a combustion system, an obviously obstructed air inlet or flue is a reason to stop and seek competent help rather than experiment. 6. Run the heating before the first genuinely cold eveningRun a short normal cycle and observe how the system starts, whether it reaches the set temperature, and whether there is unusual noise or smell, an error code, a leak or frequent on-off cycling. This is not proof of technical soundness; it is a chance to reveal an obvious problem early. 7. Review the thermostat schedule and settingsCheck the clock, day/night temperatures and periods when nobody is at home. We do not promise a universal percentage saving; the result depends on the building, weather, heating system and household habits. 8. Look for obvious draughts around doors and windowsCheck seals and places where you can clearly feel cold air entering. Start with safe, reversible actions such as correcting or replacing a visibly damaged seal. 9. Check radiators or heat delivery where relevantWith a hydronic system, check whether radiators warm up normally and reasonably evenly. A persistent cold area, unusual noise or visible leak deserves attention. With an air conditioner or heat pump, observe airflow and heating performance instead. 10. Decide what you will do if the main heating failsSave the service contact, know how to switch the system off safely, and decide how you would temporarily heat one room. Never use a barbecue, generator or other fuel-burning equipment designed for outdoor use as improvised indoor heating.
If you have only one hour tonightClear the area around heaters, test existing alarms according to their instructions, inspect visible openings and the filter, run the heating through a controlled cycle and review the thermostat. Then arrange service if anything suggests a combustion, flue, electrical or abnormal-operation problem.
Which checks apply to your system?SystemMost relevant checksGas boiler / stove / fireplace1, 2, 3, 5, 6, 10Heat pump / air conditioner3, 4, 5, 6, 7, 8, 10Radiators / hydronic system6, 7, 8, 9, 10 plus checks for the heat sourcePortable electric heater3, 6, 10
SourcesChecked 8 September 2026.Bulgarian Ministry of Interior / RDPBZN Pleven — safe use of heating appliancesEuropean Commission — winter preparedness and energy savingsU.S. CPSC — heating, fire and CO safetyU.S. Department of Energy — winter filter and thermostat guidance
