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Use this checklist once a month to catch safety, water, air-quality, and drainage problems while they are still visible: test smoke and carbon-monoxide alarms, inspect for leaks, review water use, check the HVAC filter, measure indoor humidity, run exhaust fans, look over fuel-burning equipment, inspect water fixtures and the water heater, observe exterior drainage, and update a seasonal service list.
This is a practical routine, not a universal official standard. U.S. Environmental Protection Agency (EPA) and Department of Energy guidance supports the individual checks, but the right schedule depends on your home’s equipment, climate, construction, and local code. Some items are monthly inspections; they are not instructions to replace or service everything every month.
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How to use this monthly checklist
Set aside 30 to 60 minutes and walk the house in a consistent order. Keep a flashlight, paper towels, a humidity meter, and your equipment manuals nearby. Record what you find and create a work order for anything that needs a qualified professional.
People spend an average of 90 percent of their time indoors, according to an EPA indoor-air-quality factsheet published in July 2025. A short inspection can therefore reveal issues affecting both the building and the air you breathe, but it does not replace annual servicing, required inspections, or emergency repairs.
The guidance below is U.S.-oriented. Smoke- and carbon-monoxide-alarm placement, fuel-appliance rules, and required inspections can vary by state and local jurisdiction.
1. Test every smoke and carbon-monoxide alarm
Press the test button on every smoke alarm and carbon-monoxide (CO) alarm monthly. Confirm that each unit sounds clearly and that interconnected alarms respond as intended. Follow the device instructions if the test sequence differs.
- Smoke alarms should be inside each bedroom, outside each sleeping area, and on every level, including the basement, under EPA placement guidance.
- CO alarms should be outside sleeping areas and on every level.
- Replace batteries at least once a year unless the alarm has a sealed 10-year battery.
- Replace alarms more than 10 years old, or sooner if the manufacturer specifies a shorter life.
Keep a note of each alarm’s installation date. A monthly test confirms the sounder and power source; it does not prove that a sensor will detect every kind of smoke or gas event. Follow local code and the listing and installation instructions for the specific alarm.
2. Search for visible plumbing and appliance leaks
Use a dry paper towel to check under sinks and around toilets, water heaters, dishwashers, washing machines, refrigerator water lines, and exposed supply connections. Look for fresh water, staining, corrosion, mineral deposits, swollen cabinet bottoms, aged gaskets, or a connection that has loosened.
Do not wait for a large puddle. A slow drip can damage flooring, cabinets, trim, and wall finishes over time. Tighten only connections the equipment instructions identify as user-serviceable. Shut off the local valve or the main supply and call a plumber if water is spraying, a fitting is cracked, or you cannot stop the leak safely.
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Optional leak devices fall into two useful categories:
- Spot sensors: placed near a water heater, washing machine, sink, or other vulnerable location to alert when water reaches the sensor.
- Whole-home flow monitors: installed on the supply line to identify unusual usage and, on some systems, close a shutoff valve.
Before buying either type, check whether it only alerts or can also shut off water, how it connects and sends alerts, and whether installation requires a plumber.
3. Review water use and check the meter
Compare this month’s water bill with the same month last year rather than with the previous month, because seasonal use can differ. An unexplained increase is a reason to investigate, not proof of a leak.
- Turn off faucets, appliances, irrigation, and any other water use.
- Read the water meter or photograph its display.
- Wait through a period when no one will use water, then check it again.
- If the reading changes, inspect toilets, irrigation, hose bibs, and concealed piping, and contact the utility about available leak-alert services.
A meter test can reveal a hidden leak that a visual walk-through misses. It cannot identify the exact location, so use the result to decide whether a plumber or leak-detection service is needed.
4. Inspect the HVAC filter without assuming a monthly replacement
Remove the filter and look for a loaded, damaged, damp, or collapsed media surface. Confirm that the printed dimensions match the slot and that the filter sits in the correct airflow direction. A filter that does not seal can allow dust around the media; one that is forced into place can restrict airflow or damage the system.
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EPA says to follow the equipment and filter manufacturer’s replacement guidance. Manufacturers typically recommend replacement every 60–90 days, but pets, construction dust, smoke, high occupancy, and system design can shorten that interval. Monthly inspection is appropriate; monthly replacement is not automatically required.
- Use only a filter size the system accepts.
- Choose a filtration rating within the furnace or air-handler manufacturer’s supported range; a higher rating is not automatically better if the equipment cannot move air through it.
- Do not bend, crush, or trim a filter to make it fit.
- For washable filters, clean and reinstall them only as the equipment instructions direct; do not substitute a disposable filter without checking compatibility.
5. Check indoor humidity and other moisture clues
Use a hygrometer in the main living area and look for condensation on windows, damp spots, peeling finishes, swollen wood, musty odors, or recurring staining. EPA indoor-environment guidance recommends keeping relative humidity around 30–50 percent.
A humidity reading outside that range is a troubleshooting signal. Find the moisture source: plumbing leaks, roof or foundation entry, drying laundry indoors, unvented showers, or an oversized or malfunctioning cooling system can all contribute. Remove standing water and repair the source rather than relying on an air cleaner or filter to solve a mold problem.
If you see extensive growth, repeated wetting, or damage inside walls or ceilings, document it and arrange an assessment by an appropriately qualified contractor. Avoid opening contaminated building materials without understanding the potential exposure and containment requirements.
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Run the kitchen range hood while cooking and the bathroom fan during showers. Check that each fan starts promptly, moves air, and vents outdoors where the system is designed to do so. A tissue held near the grille can provide a simple indication of airflow, but it is not a measured performance test.
Clean visible dust from grilles and replace or wash removable screens according to the fan instructions. Do not block a grille because it is noisy or drafty. If steam remains on mirrors long after a shower, condensation is persistent, or air appears to discharge into an attic or wall cavity, have the ducting and fan evaluated. Ventilation helps control moisture and indoor pollutants; it does not correct a roof, plumbing, or foundation leak.
7. Look over fuel-burning appliances and their vents
Visually inspect furnaces, boilers, water heaters, fireplaces, stoves, and other fuel-burning equipment for obvious damage, soot, unusual corrosion, water around the appliance, or a vent that is blocked, disconnected, or visibly deteriorated. Check that outdoor intake and exhaust openings are clear of leaves, snow, nests, and stored materials.
Do not dismantle, adjust, or repair a gas appliance, burner, flue, or safety control as part of a monthly walk-through. If you smell fuel, see a damaged vent, notice soot, or suspect a combustion problem, leave the area if necessary, follow the utility or emergency instructions for your location, and arrange qualified service. EPA guidance calls for regular inspection of fuel-burning appliances and repair of leaks; the monthly task is observation and escalation.
8. Inspect water fixtures and the water heater
Check faucets, showerheads, toilets, shutoff valves, exposed supply lines, and the water heater for drips, corrosion, aged washers or gaskets, and loose connections. Flush or operate fixtures normally and note a valve that sticks, a toilet that runs after flushing, or a relief line that discharges water.
Keep the area around the water heater clear enough to see its connections and to reach the shutoff. Do not remove safety components or change temperature and pressure settings without following the manufacturer’s instructions. WaterSense guidance notes that annual professional water-heater service may be appropriate to check all aspects of the system; a monthly inspection is not a substitute for that service.
9. Observe roof, gutter, and foundation drainage from the ground
After rain, look for water entering a basement or crawlspace, damp foundation walls, standing water beside the house, overflowing gutters, and downspouts that discharge next to the foundation. EPA identifies missing gutters and water flowing toward the house as possible causes of basement water.
This is a ground-level observation, not a direction to climb a ladder every month. Clear reachable debris only when you can do so safely. Arrange appropriate gutter, grading, waterproofing, or drainage work when water repeatedly pools or enters the building. Photographing the same locations after comparable storms can help a contractor understand the pattern.
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10. Update a seasonal and annual service list
Use the monthly visit to check whether an annual task is due. Write down the equipment, last service date, warranty requirements, and the professional you need to contact. Examples include:
- Annual inspection and servicing of wood-burning appliances and chimneys by a certified technician, where applicable.
- Professional water-heater service when recommended by the manufacturer or local requirements.
- Seasonal HVAC servicing and any filter change required by the equipment instructions.
- Repairs to drainage, ventilation, or fuel-burning equipment identified during the monthly checks.
Calendar these jobs before the heating or cooling season that makes them urgent. A monthly checklist should expose upcoming work; it should not turn annual maintenance into unnecessary monthly servicing.
What this routine does—and what it does not
The ten checks concentrate on conditions you can usually observe without opening equipment: alarm operation, water, airflow, humidity, ventilation, combustion-system warning signs, and drainage. They can help you notice a problem earlier, but the available EPA and Department of Energy guidance does not establish a universal ten-task schedule or a quantified dollar saving for following one.
Adapt the list to your home. A house without fuel-burning equipment has no appliance to inspect; one without forced-air heating has no disposable HVAC filter; a property with a private well, septic system, pool, crawlspace, or irrigation system may need additional checks. Your manuals, lease, insurance policy, and local code take priority over this general checklist.
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Keep one page or a digital note with the date, meter reading, humidity reading, filter condition, alarm test result, leaks found, and work orders opened. Record the exact filter dimensions and alarm installation dates. Consistent notes make a gradual change—such as rising water use, shorter filter life, or recurring dampness—easier to spot and give a contractor useful history.
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