Why Is My AC Not Cooling?
In DFW summers, an air conditioner that is not cooling properly is one of the most urgent home repair issues a homeowner can face. The most common causes are a dirty or clogged air filter restricting airflow, a frozen evaporator coil caused by restricted airflow or low refrigerant, a refrigerant leak, a failing capacitor on the outdoor unit, a dirty condenser coil on the outdoor unit, or a system that is simply undersized for the home. Many of these issues have simple fixes — others require a licensed HVAC technician.
How Serious Is the Problem?
Low
AC is running but struggling to keep up on extremely hot days. Likely a dirty filter or condenser coil. Check filter first before calling anyone.
Medium
AC is running but not reaching set temperature indoors. Possible refrigerant issue, frozen coil, or failing capacitor. Call an HVAC technician within 48 hours.
High
AC is not turning on at all, making loud noises, or tripping the breaker repeatedly. Call an HVAC technician same day — especially in DFW summer heat.
Typical HVAC Repair Costs in DFW
| Repair Type | Average Cost | Notes |
|---|---|---|
| Air filter replacement | $10 – $30 | DIY — check this first |
| Capacitor replacement | $150 – $300 | Very common DFW repair |
| Refrigerant recharge | $200 – $500 | Requires licensed technician |
| Evaporator coil cleaning | $100 – $400 | Annual maintenance recommended |
| Condenser coil cleaning | $75 – $200 | DIY possible with garden hose |
| Refrigerant leak repair | $400 – $1,500 | Depends on leak location |
| Full AC unit replacement | $3,500 – $7,500 | Average DFW home |
| Full HVAC system replacement | $6,000 – $12,000 | Both indoor and outdoor units |
Refrigerant handling requires an EPA 608 certification. Never attempt to recharge refrigerant yourself — it is illegal without certification.
What Can You Check Yourself Before Calling?
Before calling an HVAC technician check these items yourself: Replace the air filter if it has been more than 30 days — a clogged filter is the number one cause of poor cooling in DFW homes. Check the outdoor condenser unit and rinse the coils gently with a garden hose if they look dirty. Make sure all supply vents inside the home are open and unobstructed. Check the circuit breaker for the AC unit. If the system has ice forming on the indoor unit turn it off and let it thaw for 2 hours before restarting. If none of these resolve the issue call a licensed HVAC technician.
What NOT to Do
- •
Do not run the AC if ice is forming on the indoor unit — turn it off and let it thaw first
- •
Do not attempt to add refrigerant yourself — it is illegal without EPA certification
- •
Do not ignore a system that is tripping the breaker — this indicates a serious electrical issue
- •
Do not block or close supply vents to redirect airflow — it increases pressure and damages the system
- •
Do not wait more than 24 hours to call for help during a DFW summer — heat illness is a real risk
When to Call an HVAC Technician
Call a licensed HVAC technician if the system is not turning on, if refrigerant issues are suspected, if the system is making grinding or squealing noises, or if the breaker is tripping. In DFW summers with temperatures above 100 degrees, a non-functioning AC is a health emergency for elderly residents, young children, and pets. Most reputable HVAC companies in DFW offer same-day service during peak summer months.
Real Example: Fort Worth Homeowner
A homeowner in Fort Worth called an HVAC company in July because their AC was blowing warm air. The technician found a completely clogged air filter that had caused the evaporator coil to freeze solid. The technician thawed the coil, replaced the $12 filter, and charged a $95 service call fee. Total cost: $107. The homeowner had not changed the filter in over a year. A simple monthly filter check would have prevented the issue entirely.
Frequently Asked Questions
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