HVAC Services in Converse, TX

An AC that runs without cooling effectively is often losing refrigerant through a coil or line set leak. As refrigerant drops below the correct charge, the system loses its ability to transfer heat efficiently, so the compressor keeps running without achieving the setpoint. In Converse, coil leaks in systems with several years of use are a common cause of this complaint, especially as summer heat pushes equipment to run at maximum capacity for extended periods.

A sudden jump in energy costs — rather than a gradual increase — often points to a mechanical failure rather than an efficiency decline. A failing blower motor that is drawing more current to maintain output, a refrigerant issue forcing longer run cycles, or a contactor that is not releasing cleanly can all drive energy consumption up sharply without changing the home’s temperature noticeably. A technician can isolate the cause through a full system evaluation rather than guessing at the source.

A faulty thermostat typically shows up as inconsistent cycling — the system turns on and off too frequently, runs longer than expected, or fails to start when the setpoint calls for it. If the system behavior changes when you manually adjust the thermostat setting, or if you notice the display giving incorrect temperature readings, the thermostat is a likely suspect. A technician can test thermostat signal output and verify whether the issue is in the control unit or elsewhere in the system.

The most common signs of a refrigerant leak include an AC that blows air that feels less cold than usual, ice forming on the refrigerant lines or evaporator coil, a hissing or bubbling sound near the indoor or outdoor unit, and rising energy bills without a change in usage. A technician can confirm a leak by checking system pressures against the manufacturer’s specifications and can locate the breach for repair before recharging the system.

Sigma Air technicians follow a full-system diagnostic process rather than addressing only the reported symptom. The evaluation covers refrigerant pressures, electrical connections, capacitors, blower motor function, coil condition, thermostat signal accuracy, and condensate drainage. In Converse, where systems run hard across long cooling seasons and may carry years of deferred maintenance, this approach helps identify secondary issues before they cause a follow-up failure.

Call Sigma Air’s 24-hour emergency line at 210-610-2332. Our team is available around the clock and can dispatch a licensed technician for urgent no-cooling and no-heat calls. While waiting, turn off the system to prevent additional electrical stress on a potentially failing component, and check that the circuit breakers for the air handler and outdoor unit have not tripped. Do not attempt to reset a tripped breaker more than once before speaking with a technician.

Thermostat replacement is typically straightforward and relatively low-cost, so it often makes sense even when the main unit is older. If diagnostics confirm the thermostat is the root cause of cycling problems or temperature inaccuracy, replacing it restores normal operation without touching the mechanical system. The decision to repair versus replace the main unit is separate and should be based on the system’s age, refrigerant type, and cumulative repair history rather than thermostat issues alone.

After summer, replace the air filter, clear any debris from around the outdoor unit, and test the heating function before temperatures drop — catching a furnace or heat pump issue in fall is far less stressful than discovering it on the first cold night. Scheduling a fall maintenance visit lets a technician check the heat exchanger, igniter, and burner operation before the heating season begins. Converse homes that ran HVAC systems hard through a long cooling season particularly benefit from this transition-season checkup.