Lake Alfred AC Repair: Why Your Unit Runs But Won’t Cool

Estimated Read Time: 9 minutes

AC running but not cooling is the Florida headache no one needs, especially on a humid Orlando afternoon. The good news is most causes are fixable, and a few checks can save time and money. Below are the seven most common reasons, what you can safely troubleshoot, and when to call Del-Air for same-day help. Watch for a coupon to lower today’s bill.

1) Thermostat or settings are working against you

A simple setting can block cooling. Make sure the thermostat is set to Cool and the fan is on Auto. If it is set to On, the blower may push warm air when the system is not actively cooling. Also check temperature holds, schedules, and locked modes on smart stats.

Quick checks:

1. Confirm Cool mode and a setpoint at least 3 degrees below room temp.
2. Replace low batteries and reseat the thermostat on its base.
3. For Wi‑Fi stats, ensure the app did not apply a vacation or eco mode.

If settings look right and air is still warm, you may have an airflow or refrigerant issue.

2) A clogged filter is choking airflow

A dirty filter starves your system of air. That reduces cooling, increases run time, and can freeze the indoor coil. In Central Florida’s pollen season, filters clog faster than normal.

What to do:

1. Replace a 1-inch filter every 30 to 60 days in summer.
2. Use the correct size and arrow direction toward the blower.
3. If you see excessive dust at vents, consider a higher MERV or whole‑home air purifier.

Pro tip: A clean filter can drop energy use by up to 15 percent and helps prevent breakdowns.

3) The evaporator coil may be frozen

Ice on the indoor coil stops heat transfer. You will feel weak airflow and lukewarm air. Causes include a clogged filter, closed vents, low refrigerant, or a failed blower.

Safe steps:

1. Turn the system Off, set fan to On to speed thawing.
2. Place towels near the air handler to catch meltwater.
3. After 2 to 4 hours, install a new filter and restart on Auto.

If ice returns, you likely have a deeper airflow or refrigerant problem that needs a licensed tech.

4) Low refrigerant or a leak is robbing cooling power

Your AC should never “use up” refrigerant. If levels are low, there is a leak. Symptoms include long run times, warm supply air, hissing at lines, or icing. Refrigerant issues reduce efficiency and can damage the compressor.

Why call a pro:

1. EPA rules apply to refrigerant handling.
2. Proper diagnosis includes leak detection, repair, evacuation, and a precise charge.
3. Incorrect charging can shorten system life and raise energy costs.

Del-Air provides same‑day diagnostics and repair, with 24/7 emergency support if your home is overheating.

5) The outdoor condenser cannot breathe

Florida lawns, palm fronds, and cottonwood fluff can block the outdoor unit. Dirt on the coil acts like a blanket. The system runs, but heat cannot leave your home.

DIY steps:

1. Shut power at the disconnect before cleaning.
2. Clear 2 feet of space around the unit on all sides.
3. Gently rinse the coil from inside out with a garden hose.

If fins are matted with grime, schedule a professional coil cleaning to protect the compressor and restore capacity.

6) Duct leaks or closed vents are wasting cold air

Leaky ducts can spill 20 to 30 percent of cooled air into attics or garages. Closed supply vents raise static pressure and can freeze the coil. Rooms feel uneven and the AC never catches up.

What to look for:

1. Hot bonus rooms or a dusty hallway return grille.
2. Kinked flex duct or crushed runs after attic work.
3. Whistling sounds and visible gaps at joints.

A Del-Air duct inspection can locate leaks, balance airflow, and improve comfort and efficiency in a single visit.

7) The system is undersized, oversized, or past its prime

If your AC is 12 to 15 years old, capacity loss is common. An oversized unit short cycles and leaves humidity. An undersized unit runs non‑stop and still cannot hit setpoint on 95 degree days.

How we solve it:

1. Load calculation to right‑size equipment for your home.
2. Options for high‑efficiency central AC, ductless mini‑splits, or heat pumps.
3. Financing as low as 0 percent on new systems, subject to approval.

When repair is still the best value, we will explain options clearly with upfront pricing.

When to call a professional vs DIY

Do these safely on your own:

1. Replace filters and confirm thermostat settings.
2. Clear debris at the outdoor unit and open all vents.
3. Thaw a frozen coil, then restart with a new filter.

Call Del‑Air immediately if you notice:

1. Persistent ice, hissing, or oily residue on refrigerant lines.
2. Burning smells, tripped breakers, or water near the air handler.
3. Repeated short cycling or the system running for hours without cooling.

Prevent problems before peak heat

Regular maintenance reduces breakdowns and energy waste. Our comprehensive A/C tune‑up checks refrigerant charge, electrical components, safety controls, and airflow. It is designed for Florida’s heat and humidity. Members of our Maintenance Agreement Plan get priority scheduling, discounts, and peace of mind all year.

Improve indoor air and comfort while you cool

High humidity makes air feel warmer. We install and service humidity control equipment and whole‑home air purifiers that provide active protection against indoor pollution. Proper dehumidification can make 75 degrees feel comfortable and help your AC cycle correctly.

Why homeowners choose Del‑Air for tough cooling problems

• Same‑day service and 24/7 emergency support when your AC will not keep up.
• Licensed, insured, and background‑checked technicians with over 40 years of local experience since 1983.
• BBB accredited with an A+ rating and more than 400 fully stocked trucks for fast parts access.
• Clear explanations, upfront pricing, and options for repair, tune‑ups, or replacement.
• One trusted team for HVAC, plumbing, and electrical so fixes do not stall on related issues.

Special Offers for Faster Relief

• Special Offer: FREE Trip Charge with Paid Repair. Valid Jan 1, 2026 to Jul 31, 2026. Terms apply.
• Special Offer: $29 Comprehensive A/C Tune‑up. Valid Apr 1, 2026 to Jul 31, 2026. Terms apply.

Call (407) 710-2048 and mention this blog to claim your offer, or schedule at delair.com/orlando-south.

What Homeowners Are Saying

"Gregory did an outstanding job repairing our AC unit. He was efficient, courteous, and highly professional from start to finish. What really stood out was how clearly he explained everything that was happening at each step, which gave us a lot of confidence in the work being done.Even more importantly, he genuinely seemed to care about us as people, not just as customers. That level of service is hard to find, and we truly appreciated it.Highly recommend Gregory to anyone needing AC service!"
–Gregory, AC Repair

"Avery was super fantastic! Came late on a Saturday of the long weekend and worked until he solved the issue and got the ac unit up and running! So happy he was able to fix this! Give Avery a raise! He deserves it!"
–Avery, AC Repair

"Danny and Arion are great techs. Very informative and skilled. They make sure the job gets done right! Thank you for your high quality service. I recommend Del Air to anyone with AC issues."
–Danny and Arion, AC Repair

"Ronald from Del Air came out today to perform preventative maintenance on my unit, and I couldnt be more impressed with the service he provided. He was extremely detail oriented and took the time to thoroughly explain my options in a patient and professional manner. His customer service skills were outstanding, and he approached everything with a solutions-oriented mindset that immediately put me at ease... I highly recommend Ronald and the Del Air team!"
–Ronald, AC Service

Frequently Asked Questions

Why is my AC running but not cooling?

Incorrect thermostat settings, a clogged filter, frozen coil, low refrigerant, dirty condenser, duct leaks, or an aging unit can cause this. Start with filter and settings. If air is still warm, schedule diagnostics.

Should I turn my AC off if the coil is frozen?

Yes. Turn the system Off and set the fan to On to thaw the coil. Replace the filter. If ice returns or you hear hissing, call a licensed technician for diagnosis and repair.

How long does it take a frozen coil to thaw?

Usually 2 to 4 hours with the system Off and fan On. Place towels near the air handler to catch water. Do not chip ice, which can damage fins and tubing.

What does AC repair usually cost?

Costs vary by issue. Thermostat or capacitor fixes are less than refrigerant leak repairs. We offer upfront pricing and a free trip charge with paid repair during the current promotion.

Will a tune‑up help if my AC is not cooling?

Yes, if the cause is dirty coils, airflow problems, or weak electrical components. Our comprehensive A/C tune‑up targets these issues and can restore performance and efficiency.

In Summary

If your AC is running but not cooling, start with simple fixes and call for help when signs point to airflow or refrigerant problems. Del‑Air offers same‑day AC repair in Orlando and across Central Florida, with 24/7 emergency support and upfront pricing.

Ready for Cooler Air? Call or Schedule Now

Call (407) 710-2048 or book at delair.com/orlando-south. Ask for the FREE Trip Charge with Paid Repair or $29 Tune‑up while offers last.

Call (407) 710-2048 now for same‑day AC repair, or schedule at delair.com/orlando-south. Mention the FREE Trip Charge with Paid Repair or $29 Tune‑up to save today.

Del-Air Heating, Air Conditioning, Plumbing and Electrical has served Florida homes since 1983. We offer same-day service and 24/7 emergency support. Our licensed, insured, and background-checked technicians arrive in fully stocked trucks. We are BBB accredited with an A+ rating and a Lennox Premier Dealer. One trusted team for HVAC, plumbing, and electrical. Upfront pricing, financing options, and strong guarantees. Proudly serving Orlando, Kissimmee, Lakeland, and nearby communities.