HVAC and AC Repair in Round Rock, TX
Air conditioners, heat pumps and furnaces in Round Rock and Williamson County
Heating and Air Conditioning in Round Rock
University AC Repair works on central air conditioners, heat pumps, gas and electric furnaces, air handlers, ducts and thermostats in Round Rock, Texas and the rest of Williamson County.
Round Rock sits on the Balcones Escarpment, with flat Blackland Prairie east of I-35 and hilly ground to the west. The city grew up around the round rock crossing on Brushy Creek, and most of its houses are newer than that history suggests: Census figures put the median Round Rock home at about 2002 construction, with the 2000s the biggest building decade. Those houses are now on their second outdoor unit or about to need one.
Heat here is split almost evenly. About half of Round Rock homes heat with natural gas and about half with electricity, so the same street can have a gas furnace that needs repair and a heat pump that needs repair.
HVAC Services in Round Rock
AC Repair in Round Rock
Capacitors, contactors, fan motors, compressors and refrigerant leaks on central air and heat pumps that will not cool.
AC Repair detailsHVAC Repair in Round Rock
Frozen coils, water leaks from clogged drain lines, weak airflow, crushed attic ducts, short cycling and thermostat faults.
HVAC Repair detailsAC Service in Round Rock
Spring tune-ups: coil cleaning, drain line flushing, capacitor and refrigerant checks, and twice-a-year heat pump service.
AC Service detailsHeating Repair in Round Rock
Heat pumps, heat strips, electric furnaces and mini-splits: reversing valves, defrost boards and refrigerant in heat mode.
Heating Repair detailsFurnace Repair in Round Rock
Gas furnaces in attics and closets: igniters, flame sensors, gas valves, inducer motors and limit switches.
Furnace Repair detailsSummer Load in Central Texas
The 1991 to 2020 NOAA normals at Lake Georgetown, the closest station with temperature records, put the average July high near 96 degrees and August near 97. About 112 days a year reach 90 and about 20 reach 100. Cooling degree days outnumber heating degree days there by roughly 2,750 to 1,950 (NOAA climate normals).
That is why AC repair in Round Rock is mostly about parts that wear out under heat: run capacitors, contactors, fan motors and refrigerant joints. A yearly spring AC tune-up catches many of them before July. Water in the attic pan or a coil that keeps icing over is covered under HVAC repair.
Refrigerants: R-22, R-410A and Newer Systems
EPA phased out production and import of R-22 (EPA R-22 phaseout), so older systems that still use it run on recovered and reclaimed refrigerant. Under the AIM Act Technology Transitions rule, new residential air conditioning and heat pump systems have to use refrigerants with a global warming potential of 700 or less (EPA Technology Transitions program). Existing R-410A systems can still be repaired and serviced.
Service Area
Round Rock neighborhoods include Teravista, Paloma Lake, Mayfield Ranch, Behrens Ranch, Eagle Ridge, Stoney Brook, Lake Forest and Old Round Rock. The towns around it each have their own page.
| City | ZIP codes | Page |
|---|---|---|
| Round Rock | 78664, 78665, 78681 | HVAC in Round Rock |
| Georgetown | 78626, 78628, 78633 | HVAC in Georgetown |
| Pflugerville | 78660 | HVAC in Pflugerville |
| Hutto | 78634 | Heat pump repair in Hutto |
| Cedar Park | 78613 | HVAC in Cedar Park |
| Leander | 78641 | HVAC in Leander |
| Taylor | 76574 | HVAC in Taylor |
The full list with notes on each town is on the Round Rock HVAC service area page.
Sources and local offices: TDLR air conditioning program, ENERGY STAR heating and cooling.
HVAC Questions in Round Rock
What is the first thing to check when the AC stops working?
The thermostat. Make sure it is set to cool, the setting is below room temperature and the screen is not blank. Then check the breaker panel and the air filter.
What should I check before calling an air conditioner repair company?
Thermostat setting and batteries, the breakers for the indoor and outdoor units, the disconnect beside the outdoor unit, the air filter, and the drain pan under an attic unit for standing water.
How cool should my house be if it's 100 outside?
Most systems are designed to hold about 20 degrees below the outdoor temperature, so 78 to 80 inside on a 100 degree afternoon can be normal. Setting the thermostat to 70 will not cool the house faster.
Will the AC shut off if the drain is clogged?
It will if the system has a float switch, and most attic systems do. The switch cuts cooling when water backs up in the pan or drain line, while the blower may keep running. Without one, the water overflows instead.
How long do home AC units last in Texas?
Shorter than in milder states, because Central Texas systems run many more hours a year. Upkeep, coil condition, refrigerant type and how well the system was installed all change the number.
Is Freon being phased out?
R-22, the refrigerant most people call Freon, has been phased out of production and import in the U.S. Systems that use it can still be repaired with recovered and reclaimed R-22.
Can you still install R-410A systems in 2026?
EPA's Technology Transitions rule sets a global warming potential limit of 700 for new residential AC and heat pump systems, and R-410A is well above that. New systems use lower-GWP refrigerants instead. Existing R-410A systems can still be serviced and recharged.
What utilities does Round Rock provide?
The city handles water service through its utility billing office. Its connect-service page sends residents to Oncor for electric delivery, with a retail electric provider of their choice, and to Atmos Energy for natural gas (Round Rock utility setup).
What is the 3 minute rule for air conditioners?
After an air conditioner shuts off, the compressor should rest about three minutes before restarting so the refrigerant pressures can even out. Most thermostats build in that delay.
What is the most common problem with air conditioning?
Dirty filters and coils that cut airflow, followed by failed capacitors, clogged drain lines and refrigerant leaks.