HVAC Repair in Round Rock, TX
Frozen coils, drain leaks, airflow, ducts and thermostats
HVAC repair in Round Rock for the problems that involve the whole system rather than one part: a coil that keeps freezing, water on the floor by the air handler, weak airflow at the vents, short cycling and thermostats that read wrong.
These faults often start in one place and show up in another. A clogged drain line in the attic can shut off cooling. A crushed duct can make one bedroom hot while the rest of the house is fine. A thermostat on an outside wall can run the system in short bursts. For outdoor unit failures see AC repair in Round Rock.
Frozen Coils
Ice forms on the indoor coil when it gets too cold, usually from low airflow or a low refrigerant charge. The usual airflow causes are a packed filter, a dirty coil, a weak blower motor or closed and blocked returns. Turn cooling off and run the fan to thaw it. If the ice comes back, the cause is still there.
Water Leaks and Drain Lines
In most Round Rock houses the air handler sits in the attic or a hall closet, with a drain line that carries condensate outside or into a plumbing drain. Algae and dust clog that line in summer. Repairs cover clearing and re-running drain lines, replacing cracked secondary pans, adding or replacing float switches and replacing failed condensate pumps.
Airflow, Ducts and Returns
Flex duct in a hot attic can sag, kink, pull loose at a collar or get crushed. Each one shows up as a room that never cools. Duct repair covers reconnecting and sealing runs, replacing damaged sections and fixing return air leaks. Air filter choice matters too, since a filter that is too restrictive for the blower cuts airflow (EPA guide to home air cleaners).
Thermostats and Controls
Thermostat work includes replacing failed or wrongly wired thermostats, adding a common wire for smart thermostats, moving a thermostat off a sunny or drafty wall and repairing low-voltage wiring between the thermostat, air handler and outdoor unit. Power in most of Round Rock is delivered by Oncor electric delivery, and a voltage problem from the street is a call to the utility, not the HVAC contractor.
See also AC service and coil cleaning, furnace repair in Round Rock and the towns on the service area page, including Cedar Park and Leander.
Sources and local offices: EPA Section 608, EPA air cleaner guide, Oncor.
HVAC Repair Questions
Should I turn my AC off if it's frozen?
Yes. Set the thermostat to off for cooling and turn the fan to on. Air moving over the coil thaws it faster. Running cooling with ice on the coil can push liquid refrigerant back to the compressor.
What causes an AC unit to keep freezing?
Low airflow and low refrigerant are the two big causes. Airflow problems include dirty filters, a dirty evaporator coil, a slow blower and blocked returns. A refrigerant leak drops coil temperature below freezing.
Will my AC unfreeze on its own?
It will thaw if cooling is off, often within a few hours with the fan running. It will freeze again unless the airflow or refrigerant problem is fixed.
How do I know if my AC drain is clogged?
Water in the secondary pan under an attic unit, water dripping from a pipe over a window, a musty smell, water around a closet air handler, or a system that shuts off cooling while the fan keeps running.
why is my ac leaking water even when turned off
Ice on the coil melts after the system shuts off, and that water can overflow a clogged drain or a rusted pan. Water that keeps coming with the system off for hours may be a plumbing leak, not the AC.
is water leaking from ac dangerous
The water itself is not, but it can soak ceiling drywall under an attic unit, grow mold and reach wiring. Shut the system down and set out a bucket or towels until the drain line is open again.
How do I stop my AC from short cycling?
Check the filter, keep the outdoor coil clear and move the thermostat if it sits in sun or near a supply vent. If it still cycles every few minutes, the cause may be a failing capacitor, a refrigerant problem, an overheating compressor or a system too large for the house.
Why can I barely feel air coming out of my vents?
A clogged filter, an iced coil, a failing blower motor, a disconnected duct in the attic or closed dampers. If only one room is weak, look at that room's duct run first.
How do you know if a thermostat is bad?
A blank screen with fresh batteries, a system that will not start when the setting calls for it, room temperature that does not match the display, or a system that runs nonstop after the target is reached.
Why is my AC set to 72 but reads 78?
The system cannot keep up. On a very hot day that can be the heat load. On a normal day, look at the filter, a dirty outdoor coil, a low charge or leaking ducts.