QUICK ANSWER
If your AC is running but your house won't cool below 80F in Arizona, the most common causes are: dirty air filter (restricts airflow), low refrigerant (system can't transfer heat), failing capacitor (compressor not running at full capacity), or undersized system (can't keep up with 115F heat). Bradford diagnoses same-day - $0 service call with approved repair. Call (623) 624-6246.
AC Not Cooling House in Arizona - What's Wrong?
AC running but house won't cool below 80F in Arizona? Bradford explains the 7 most common causes - from a dirty filter to a failing compressor - and what to do.
1. Dirty Air Filter (Most Common)
A clogged filter is the #1 cause of an AC that runs but doesn't cool. Check your filter first - if it's gray or brown, replace it immediately. In Arizona summer, filters need changing every 30-45 days.
2. Low Refrigerant (You Have a Leak)
If your AC is low on refrigerant, it can't transfer heat efficiently. The system runs constantly but the house stays warm. Bradford finds and fixes the leak before recharging.
3. Failing Capacitor
The capacitor starts and runs your compressor. A weak capacitor means the compressor runs at reduced capacity - your AC blows air but it's not cold enough. Bradford replaces capacitors same-day for $196-$416.
4. Dirty Condenser Coils
The outdoor unit's condenser coils release heat from your home into the outside air. If they're clogged with dust, dirt, or cottonwood seeds, heat transfer is severely reduced. Bradford cleans coils as part of the $59 tune-up.
5. Undersized System
In Arizona's extreme heat, an undersized AC simply can't keep up. If your system runs constantly and the house is still 80F+ at 3 PM, the system may be too small for your home. Bradford performs a Manual J load calculation to size systems correctly.
6. Duct Leaks
If 20-30% of your conditioned air is leaking into your attic before it reaches your rooms, your AC will run constantly and your house will stay warm. Bradford offers duct inspection and replacement.
7. Failing Compressor
The compressor is the heart of your AC. If it's failing, the system runs but doesn't cool. Compressor replacement typically costs $1,500-$2,500 - at that price, Bradford usually recommends replacing the full system.
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