By Coolax USA | Orlando’s Premier HVAC Experts
Feeling like your AC is running—but not cooling your home like it should? In Florida’s blazing summer heat, weak airflow or lukewarm temperatures can be frustrating, especially when your unit seems to be working just fine.
Before calling a technician, you can quickly test your air conditioner’s cooling capacity using a simple 5-step method. Here’s how to do it:
? What You’ll Need:
- A basic thermometer (a refrigerator thermometer works great)
- A screwdriver (if your air vent covers are screwed in)
- Optional: painter’s tape to secure the thermometer
? Step-by-Step: How to Test Your AC’s Cooling Power
Step 1 – Set It Low
Turn your thermostat down at least 5–10°F below room temperature so the system stays on during your test.
Step 2 – Choose Your Vents
Locate:
- A supply vent (blows cool air into the room)
- A return vent (pulls warm air from the room back into the system)
These are often near your indoor unit.
Step 3 – Measure the Supply Air Temperature
Tape your thermometer inside the supply vent. Let the system run for 10–15 minutes, then note the temperature.
Step 4 – Measure the Return Air Temperature
Now, move the thermometer to the return vent. Again, wait until the temperature reading stabilizes.
Step 5 – Do the Math
Subtract the supply vent temperature from the return vent temperature.
? A difference of 14°F to 20°F means your system is cooling effectively.
? What If the Temperature Drop Is Too Small?
If your AC’s temperature difference is under 14°F, one of these common issues may be to blame:
1. Low Refrigerant
Low refrigerant can cause your AC to blow lukewarm air. A certified HVAC technician must check for leaks and recharge the system.
2. Dirty Evaporator Coil
Dust buildup on evaporator coils blocks heat transfer. Regular coil cleaning boosts system efficiency.
3. Clogged Air Filter
A dirty filter restricts airflow and reduces cooling power. Change it monthly to ensure peak performance.
? Understanding the 18-Degree Rule
Even the best-functioning AC unit has its limits. A well-maintained system can only achieve an 18–20°F differential between the indoor air and outdoor temperatures.
So, if it’s 95°F outside, your system will realistically cool your home to around 75–77°F. This is especially true for older systems.
To stay cool on extremely hot days:
- Keep blinds/curtains closed
- Use ceiling fans
- Avoid using heat-generating appliances (like ovens) during peak hours
?? Still Not Cool Enough? Let Coolax USA Help
If your AC isn’t meeting expectations, don’t sweat it—Coolax USA has you covered. We offer expert diagnostics, system tune-ups, and emergency repairs across the Orlando metro area.
? Call: (407) 900-9790
? Schedule Online: www.coolaxusa.com
? Licensed, insured, and proudly serving Central Florida