HVAC Maintenance Tips for McAllen Homeowners

Airflow is the foundation of cooling performance. Everything downstream — coil temperature, dehumidification, compressor health — depends on moving the designed volume of air across the coil.

Buy filters in packs, note the size, and change on a schedule rather than by appearance. Very high MERV ratings can restrict airflow on residential blowers, so mid-range pleated filters are usually the better tradeoff unless a technician has verified your system can handle more.

• Locate the condensate drain access near the air handler
• Pour about a cup of distilled white vinegar down the access monthly during cooling season
• Avoid bleach, which can corrode metal pans and fittings
• Watch for water at the outdoor drain termination — no drip on a humid day can mean a blockage
• Check the attic secondary pan for standing water after a hot, humid stretch

• Keep about two feet of clearance on all sides and five feet above
• Trim shrubs and keep grass clippings away from the coil
• Shut power off at the disconnect, then rinse the coil gently from the outside in with a garden hose
• Never use a pressure washer and never bend the aluminum fins
• Keep the unit level — a tilted condenser stresses the compressor mounts
• Do not cover the unit in summer; covers are only for extended shutdowns

Setting a thermostat far lower than your target does not cool the house faster — the system delivers the same capacity either way, it just runs longer. Pick a set point you can live with and let it hold.

For homes that are empty during the day, a modest setback of three to four degrees works well in the Valley. Deep setbacks can backfire, because recovering a hot, humid house takes long run times and the humidity lags behind the temperature.

• Keep the fan on Auto rather than On; continuous fan re-evaporates moisture off the coil
• Verify the thermostat is not in direct afternoon sun
• Check the schedule after any power outage

• Keep all supply registers and return grilles unblocked by furniture and rugs
• Close blinds on west-facing windows during afternoon peak
• Run bath and kitchen exhaust fans to remove moisture at the source
• Add attic insulation if you are below current recommendations — it lowers the load your system fights
• Seal obvious gaps around attic access hatches and can lights

• Anything involving refrigerant — it is regulated and requires certification
• Capacitors, which store a dangerous charge even with power off
• Opening electrical panels or the blower compartment on a live system
• Bending or brushing coil fins
• Repeatedly resetting a breaker that keeps tripping