🌡️ AC Running All Day But Won't Reach Temperature, Georgetown TX

Is This a Failure or Just Georgetown's Heat?

First, an important baseline: on a 103°F Georgetown day, a properly sized AC system maintaining 72-74°F is working near its design limit. If your system is keeping up on 95°F days but struggling on 103°F days, that's worth noting but may be within normal parameters.

If your system can't maintain setpoint on a 95°F day, or can only hold 78-80°F when it used to maintain 72-74°F, that's a system problem requiring diagnosis.

6 Causes of a Georgetown AC That Won't Reach Setpoint

1. Low Refrigerant Charge (Most Performance-Impacting)

Low refrigerant reduces cooling capacity proportionally. A system that's 15% low on refrigerant loses approximately 25-30% of cooling capacity. In Georgetown's heat, this turns a system that used to maintain 72°F into one that struggles to hold 78°F. We check refrigerant pressure against outdoor ambient temperature, not just against a standard chart.

2. Dirty Evaporator Coil (Common After Pollen Season)

The indoor evaporator coil removes heat from your home's air. When coated with dust, pollen, and debris from Georgetown's heavy pollen seasons, it loses heat transfer efficiency. A 10% coated coil loses approximately 15% of cooling capacity, enough to push a properly-sized system into "can't keep up" territory on peak summer days.

3. System Undersizing (Extremely Common in Georgetown New Construction)

If you moved into a Wolf Ranch, Morningstar, or Sun City home and the AC has never adequately cooled on hot days, the system was likely undersized at installation. Builder-grade sizing to code minimums is common in Georgetown's rapid construction environment. We do Manual J calculations to confirm and quantify undersizing.

4. Duct Leakage (Often Overlooked)

Georgetown's new construction and foundation settlement can create duct disconnections or large leaks that send 15-25% of conditioned air into attic space. If your upstairs is always 8-10°F hotter than downstairs in summer, duct leakage is a strong suspect.

5. Dirty Condenser Coil (Outdoor Unit)

The outdoor condenser rejects heat from your home into the outside air. A dirty outdoor coil in Georgetown's extreme heat means your system can't reject enough heat, the condensing pressure rises and capacity falls. Annual condenser cleaning as part of spring maintenance prevents this.

6. Failing Capacitor (Early Stage)

A capacitor reading 15-20% below spec still allows the system to run but at reduced compressor efficiency. Performance degradation before complete failure. Caught at spring maintenance, replaced proactively.