Common causes of wasted cooling energy
Dirty or overly restrictive filter
A dirty filter slows airflow and can make the system work harder. Check it monthly during heavy-use periods and use the filter type recommended for the equipment.
Airflow or blower problems
Blocked returns, closed or obstructed supply vents, dirty coils, or blower problems can reduce delivered cooling. ENERGY STAR notes that airflow problems can materially reduce system efficiency.
Leaking, disconnected, or poorly insulated ducts
Ducts in a hot attic can lose cooled air before it reaches the rooms. Uneven temperatures, weak vents, dusty attic insulation near a leak, or unexpectedly long runtime can be clues, but a proper duct assessment is safer and more reliable than guessing.
Incorrect refrigerant charge or dirty coils
Too much or too little refrigerant and dirty evaporator or condenser coils can reduce efficiency and increase runtime. Refrigerant and internal coil work require trained service personnel.
Equipment sizing or installation problems
Oversized systems may short-cycle and control humidity poorly. Undersized systems may struggle during design conditions. Poor installation, duct sizing, or airflow can raise bills even when the equipment itself is relatively new.
Insulation and air-sealing problems
An A/C system cannot overcome unlimited heat gain efficiently. Missing attic insulation, leaky penetrations, damaged weatherstripping, and strong solar gain can keep the cooling load high.
Compare similar days
Use outdoor conditions and Smart Meter Texas daily usage to compare the home before and after a suspected change. If similar-temperature days now require much more kWh, document the dates, settings, runtime, and comfort problems for the technician.
Turn equipment off and seek qualified help for burning smells, sparking, damaged wiring, repeated breaker trips, significant water leakage, or other safety concerns. Do not open electrical panels or handle refrigerant yourself.