Filters, dryer vents, thermostats — the small jobs that prevent the big bills
Most appliance failures are not failures. They are maintenance nobody did. An air conditioner dies in August because the filter has been in since March; a dryer catches fire because the vent has never been cleaned; a water heater bursts because nobody knew it needed draining. This guide is almost entirely about ten-minute jobs on a schedule, and in a North Texas summer the air conditioning one is not a comfort issue — a failed AC in a heatwave is genuinely dangerous for the elderly.
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Knowing where to stop is a skill, not a failure of nerve. These jobs are not DIY:
Correct-size air filters
Size is printed on the old one. Buy a year's worth at once.
Vacuum with a hose
Does most of this guide.
Dryer vent brush kit
About $15 and genuinely prevents house fires.
Garden hose
For draining the water heater.
Stiff brush and coil cleaner
For AC and fridge coils.
Phone camera
Photograph model and serial plates. It saves an hour when ordering parts.
Part 1
A blocked filter is the number one cause of air conditioning failure, and in this climate that failure always happens on the hottest day, when every technician is booked.
Find every filter
Usually a slot at the indoor air handler, or a grille in a hallway or ceiling. Many homes have more than one and people only ever change the one they know about. Walk the house and find them all.
Check the size and direction
The size is printed on the edge of the old filter. There is an arrow marked AIRFLOW — it must point toward the unit, in the direction air travels. Fitted backwards, the filter collapses and does nothing.
Change on a schedule, not on inspection
Every one to three months. Every month in summer here, and monthly if you have pets or allergies. Write the date on the edge of the filter in marker as you fit it — then you never have to remember or guess.
Do not over-specify
Very high MERV filters restrict airflow in systems not designed for them, which strains the blower and can freeze the coil. MERV 8 to 11 suits most homes. More filtration is not automatically better.
What a neglected filter costs
Restricted airflow makes the coil ice up, the system runs constantly without cooling, and the compressor — the expensive part — is what eventually fails. A $15 filter protects a $5,000 component.
Part 2
Dryers cause thousands of house fires a year and failure to clean them is the leading cause. This is the most important job in this guide and almost nobody does it.
The lint trap is not the vent
Clean the lint screen every single load — that part most people do. But lint also builds through the duct running to the outside wall, and that is what burns.
Clean the duct once a year
Unplug the dryer. Pull it out, disconnect the duct from the back, and use the brush kit and vacuum through the whole run from both ends. What comes out is usually alarming, which is the point.
Check the outside flap
Go outside and find the vent while the dryer runs. The flap should open with strong warm airflow. If it barely moves, is blocked with lint, or has a bird nest in it, that is your problem.
Replace foil concertina duct
The flexible foil or plastic accordion ducting traps lint in every ridge and is a known fire risk. Rigid or semi-rigid metal duct is far safer, cheap, and available at any hardware shop.
Know the warning signs
Clothes taking two cycles to dry, the dryer or the laundry room getting very hot, or a burning smell. Any of those means stop using it until the vent is cleared.
Safety
Never run a dryer overnight or when you are out of the house. If a vent fire starts, it needs someone there. This costs nothing and removes the worst-case scenario entirely.
Part 3
The most ignored appliance in the house, and the one whose failure does the most damage. Sediment is the enemy.
Know where its shutoffs are
Cold water inlet valve on top, and either the gas valve or the breaker. If it ever leaks, those are what you reach for. Label them today.
Drain the sediment yearly
Minerals settle in the bottom and insulate the burner from the water, so it works harder for less hot water. Turn off power or set gas to pilot, turn off cold inlet, attach a hose to the drain valve at the bottom, run it somewhere safe, open a hot tap upstairs to let air in, and drain a few gallons until it runs clear. Close up, refill fully BEFORE restoring power — an electric element switched on dry burns out instantly.
Set the temperature to 120°F
Factory settings are often 140°F, which scalds a child in seconds and costs more to run. 120°F is the widely recommended balance of safety and efficiency.
Test the TPR valve carefully
The temperature and pressure relief valve prevents the tank exploding. Lifting the lever briefly should release a rush of hot water down the discharge pipe. Stand clear — it is scalding. If it then drips continuously, or does nothing at all, call a plumber. Never cap or plug it.
Know when it is finished
Most tanks last eight to twelve years. Rusty water, rumbling, or any moisture around the base means plan a replacement now rather than deal with a flood later. Check the date code on the serial plate.
Part 4
In this climate the AC runs half the year. Two seasonal jobs keep it alive.
Safety
Fit carbon monoxide detectors if you have any gas appliance, and test them. A cracked furnace heat exchanger produces CO with no smell at all, and detectors are the only way anyone finds out.
Part 5
Knowing the right word is half of getting good help.
Reading changes nothing on its own.
Next guide
Change a tire, jump a battery, read the lights, and stop being overcharged
