HVAC Questions, Answered for South Texas

The five most common causes are a clogged air filter restricting airflow, a frozen evaporator coil, low refrigerant from a leak, a failed capacitor preventing the outdoor compressor from starting, and a condenser coil clogged with dust. Check the filter first, then look at the outdoor unit. If the fan is not spinning or you hear a hum with no movement, the problem is electrical and needs a technician.

A correctly operating system delivers supply air roughly 16 to 22 degrees cooler than the air entering the return. If the return reads 78 degrees, supply should be somewhere around 56 to 62 degrees. A smaller split points to low refrigerant, restricted airflow, or a dirty coil.

The most common cause is a clogged condensate drain line. A residential system in the Rio Grande Valley pulls several gallons of water a day out of humid air, and algae blocks the drain until the pan overflows. Other causes include a frozen coil that is now thawing, a cracked drain pan, and a failed condensate pump. Switch the system off at the thermostat first to stop more water reaching your ceiling.

No. Adding refrigerant without repairing the leak is a temporary patch, not a repair. Refrigerant is a sealed loop and is not consumed in normal operation, so a low system has a leak. Repeated top offs cost more over two or three seasons than finding and fixing the leak once, and running low on charge shortens compressor life.

No. A sudden jump with no change in usage usually means the system is working much harder than it should: a dirty condenser coil, low refrigerant, a weakening capacitor, a stuck contactor keeping the compressor running, or significant duct leakage into a hot attic. All of those are diagnosable and most are inexpensive to correct.

Yes. A&A HVAC LLC services and repairs every major residential and light commercial brand regardless of who installed it, including Carrier, Trane, Lennox, Rheem, Goodman, York, American Standard, Amana, and Daikin.

Twice a year: a full cooling tune up in late winter or early spring before the season starts, and a shorter heating check in the fall. Systems here run far more hours than the national average, so the once a year guidance written for that average is on the light side. Most manufacturer warranties also require documented annual maintenance to remain valid.

A proper cooling tune up includes filter service, static pressure and airflow measurement, capacitor testing under load, contactor inspection, amp draw compared against the equipment nameplate, refrigerant pressures with superheat and subcooling, condenser coil cleaning, evaporator coil inspection, condensate drain flushing and float switch testing, and thermostat verification. You should receive the actual readings, not just a sticker on the unit.

Check a one inch filter monthly and expect to replace it every 30 to 60 days in the Rio Grande Valley, closer to 30 during dusty stretches or if you have pets. Systems here run so many hours and take in so much dust that filters load much faster than the packaging suggests. A four or five inch media filter typically lasts six to twelve months.

Four things, and all of them genuinely help. Change filters on schedule. Keep two feet of clearance around the outdoor unit. Rinse the condenser coil gently with a garden hose from the inside out, with the breaker off, twice a year. And pour about a cup of distilled white vinegar down the condensate drain access every two months during cooling season. Refrigerant work and anything requiring a panel to come off should be left to a technician.

February through early April. Cooling season in the Rio Grande Valley effectively begins in April, so servicing before then means any problem found gets repaired on a normal schedule rather than during the summer rush when appointments are hardest to get.

A&A HVAC LLC serves McAllen, Edinburg, Mission, Pharr, San Juan, Alamo, Donna, Weslaco, Mercedes, Harlingen, Palmhurst, Palmview, Hidalgo, Rio Grande City, Brownsville, and the surrounding Rio Grande Valley communities across Hidalgo and Cameron counties. Our shop is at 10202 N 14th St in McAllen.

Cost depends on what failed. Common repairs such as a capacitor, contactor, float switch, or a clogged condensate drain are at the lower end. Compressor or coil replacement is substantially more. A&A HVAC LLC diagnoses the problem, explains the cause, and gives you the price before any work begins, so nothing on the invoice is a surprise.

Yes, financing options are available for system replacement and installation. Ask when you request your estimate and we will go over the available plans and what qualifying involves.

Yes. Estimates for system replacement and installation are free and provided in writing after we see the home, because a firm price requires knowing your ductwork, equipment location, and electrical service. Diagnostic visits on an existing system carry a service charge, which is explained when you book.

Yes. A&A HVAC LLC has English and Spanish speaking technicians, so you can have the problem explained in whichever language you prefer.

Yes. A&A HVAC LLC handles rooftop package units, commercial split systems, mini split and VRF systems, and makeup air equipment for restaurants, retail, medical and dental offices, warehouses, and multi tenant properties throughout the Rio Grande Valley, with 24 hour emergency response and scheduling around your operating hours.