HVAC Maintenance and Tune-Ups in Houston

Catch the small stuff early. A clogged drain line, a weak capacitor or a coil packed with lint won’t stop your AC today, but each one makes the system work harder until something gives. We do seasonal tune-ups before the summer heat and before the first cold snaps, so your system starts each season clean and checked.

Signs You’re Due for Maintenance

It’s been more than a year since anyone checked the system.
Your power bills keep climbing, but the way you run the system hasn’t changed.
Dust settles on the furniture faster than it used to and gathers around the vents.
Airflow at the vents feels weaker than it did last season.
The system is noisier than before: a new hum, a rattle or a squeal at start-up.

Spring for Cooling, Fall for Heating

Houston’s cooling season is long and sticky, and the air conditioner carries most of the year’s load. Book the cooling tune-up before the summer heat arrives. A weak part found on a mild spring day is an easy swap, not a breakdown in the middle of a heat wave.

The heating season is short here, but a cold front can drop the temperature fast. A furnace that has sat idle since spring gets fired up on the first cold night, and that’s when a dirty flame sensor or a cracked ignitor shows itself. A check before the first cold snap finds those while the house is still warm.

What a Tune-Up Usually Covers

A thorough tune-up cleans and measures. The readings matter as much as the cleaning, because they show a part wearing out before it fails.

On the Cooling Side

Clean the outdoor condenser coil and check the fan motor and blade.
Test the capacitor against its rating and look for burnt or pitted contacts on the contactor.
Flush the condensate drain line and check the drain pan and its float switch.
Look over the evaporator coil, the blower wheel and the air filter for dust buildup.
Measure the temperature drop across the indoor coil, and check refrigerant pressures when the readings point that way.
Tighten electrical connections and make sure the thermostat starts and stops the system as set.

On the Heating Side

Clean the flame sensor and check the ignitor for cracks.
Inspect the burners and watch the flame: steady and blue is the goal.
Check the heat exchanger and the flue pipe for rust, cracks and loose joints.
Test the safety controls, such as the high-limit switch and the pressure switch.
On a heat pump, check the defrost cycle, the reversing valve and the backup heat strips.

If a reading shows a capacitor or an ignitor on its way out, you’ll hear about it then, before it leaves you without cooling or heat.

Cleaning the Outdoor Coil

Red brush pulling clumps of lint off an outdoor condenser coil beside a foundation wall

The outdoor coil is the part of a tune-up you can see. Spring pollen, grass clippings and dryer lint build up on its fins a little at a time, and a matted coil makes the whole system run longer for the same comfort. Cleaning it starts with the power off at the disconnect. A soft brush lifts the loose mat off the face of the coil, then the fins get a low-pressure rinse from the inside out, so the dirt leaves the way it came in.

Go Easy on the Fins

Coil fins are thin aluminum and fold over at a touch. A fin comb straightens the worst patches. A pressure washer flattens whole rows, and so does a hard jet from a hose nozzle. The indoor coil is a different story: it sits sealed inside the cabinet, out of reach, and the filter in front of it is what keeps it clean.

Things You Can Do Between Visits

A few minutes a month keeps the air moving between tune-ups. None of these means opening up the equipment.

Change the filter. Check it monthly in summer and swap it when it looks gray and clogged.
Clear around the outdoor unit. Trim shrubs and vines back about two feet, pull weeds, and keep leaves and grass clippings off the fins. Aim the mower’s discharge away from it.
Keep vents and returns open. Move rugs, beds and curtains off supply vents and return grilles. Shutting vents in empty rooms saves little; it raises the pressure in the ducts and pushes more air out through leaky ductwork.

Air handler on a wooden platform in a garage, a dirty pleated filter and a clean one leaning beside it

Not sure where your filter lives? Look for a slot beside the indoor unit, whether that sits in the garage, a closet or the attic, or behind a return grille in a wall or ceiling. Some houses have more than one. The arrow on the frame points toward the equipment, the way the air flows. A clogged filter starves the indoor coil of air, and a starved coil can ice over in the middle of summer.

How often does a heating and cooling system need servicing?

Once a year for each side of the system is the usual rule: the cooling side in spring and the heating side in fall. A heat pump heats and cools with the same outdoor unit, so it runs most of the year and earns both visits. Homes with pets, rentals where filters get forgotten and houses near construction dust may need a look more often.

What kind of air filter should I use?

Start with the size and thickness printed on the old filter’s frame. Thin fiberglass filters stop large dust and protect the equipment, but they do little for the air you breathe. Pleated filters rated around MERV 8 to 11 suit most homes. Higher ratings catch finer particles, but a dense filter in a slot built for a thin one can choke the airflow.

Media filters four or five inches thick sit in a cabinet of their own and last far longer than one-inch filters. The label on the filter says how long.

Can a tune-up fix an AC that’s blowing warm air?

Not on its own. A tune-up is for a system that still works. Warm air at the vents means something has already failed, often a capacitor, a contactor or a refrigerant leak, and tracking it down takes an AC repair visit.