Why This Matters in Georgetown TX
Georgetown's heat means an AC system should run in 15–25 minute cycles, pulling down indoor temperature efficiently before shutting off. A system that cycles every 4–6 minutes is short-cycling — either because it's oversized (reaches temperature setpoint before dehumidifying), has a safety switch tripping repeatedly (refrigerant pressure, float switch, high-limit), or has a control board fault. Short-cycling is particularly common in Georgetown new construction where builders sometimes install oversized equipment.
Common Causes & What They Cost
Our Georgetown technicians diagnose these issues daily. Here's what we find most often.
The most common cause in Georgetown new construction. An oversized system reaches the thermostat setpoint too quickly, shuts off, and restarts minutes later. The home cools fast but never dehumidifies, leaving it cool but muggy.
$200 for Manual J; $4,500–$7,500 for properly sized replacement if confirmed oversizedA high-pressure safety switch shuts down the compressor when discharge pressure exceeds safe limits. Causes: dirty condenser coil, blocked condenser airflow, refrigerant overcharge. The system cools briefly, trips off, pressure drops, restarts.
$120–$280 coil cleaning; $150 if overcharge needs correctingLow refrigerant can trigger low-pressure safety trips. The system tries to start, pressure is too low, the safety trips, it waits and retries. This produces a distinctive short-cycle pattern.
$150–$350 recharge plus leak diagnosisA thermostat placed near a supply register receives conditioned air directly and reaches setpoint within minutes — cycling the system off before the rest of the home is comfortable.
$180–$280 thermostat relocationA failing control board, intermittent wiring connection, or contactor issue can cause the system to start and stop without completing a cycle. These require electrical diagnostics.
$250–$600 for control board diagnosis and replacementHow We Diagnose It
We measure exact cycle times — start to shutdown, and restart intervals. This tells us whether we're dealing with a safety trip, an oversized condition, or a control fault.
We check operating pressures and condenser coil condition. High discharge pressure points to coil fouling or refrigerant overcharge.
We test all safety switches in sequence — high-pressure, low-pressure, float switch, high-limit — to identify which is tripping.
If the system consistently reaches setpoint in under 8 minutes, we calculate whether the equipment is properly sized for the home using Manual J load methodology.