Longwood, FL AC Repair: When Your AC Runs but Won’t Cool

Estimated Read Time: 10 minutes

Your AC is running but not cooling the house. In Central Florida heat, that is more than a comfort issue. It can drive up bills and risk a breakdown. This guide explains why an AC runs without cooling, what you can safely check now, and when to call for AC repair near me. We include local tips for Florida humidity, algae, storms, and salt air, plus money-saving coupons and maintenance advice.

Quick Checks You Can Do Safely

Before scheduling a repair, try a few easy steps. These fixes solve many no-cool calls in Central Florida.

1. Set the thermostat to Cool and Auto.
   • Verify the set point is at least 3 degrees below room temperature.
   • Replace thermostat batteries if the screen is dim or blank.
2. Inspect the air filter.
   • If it is gray or clogged, replace it. A blocked filter reduces airflow and cooling.
3. Confirm indoor and outdoor units are running.
   • Listen for the indoor blower and check the outdoor fan at the condenser.
4. Clear supply and return vents.
   • Open all vents fully. Move rugs and furniture away from returns.
5. Check the breaker.
   • Reset a tripped AC or air handler breaker once. If it trips again, call a pro.
6. Look for ice on the refrigerant lines.
   • If you see frost or ice, switch the system Off and set the fan to On for 2 to 3 hours to thaw. Then try cooling again. If ice returns, you have a deeper issue.

If these do not restore cooling, continue reading. The sections below explain root causes and next steps.

Why Your AC Runs But Does Not Cool: The Top Culprits

Several issues let your system run without lowering the temperature. In Florida, heat, humidity, and long run times make these problems more likely.

• Dirty air filter or evaporator coil. Restricts airflow so the coil cannot absorb heat.
• Low refrigerant from a leak. The system cannot move enough heat outdoors.
• Frozen evaporator coil. Caused by airflow problems or low refrigerant.
• Dirty outdoor coil. Limits heat release to the outside air.
• Failing capacitor or fan motor. The blower or condenser fan is weak or stops under load.
• Thermostat or sensor issues. Incorrect readings cause short cycling.
• Clogged condensate drain. Some units shut off cooling when the pan switch trips.
• Duct leaks or crushed ducts. Cold air is lost in the attic or crawlspace.
• Undersized or oversized system. Either one struggles to cool during peak heat.

Next, we break down symptoms and fixes for each cause.

Airflow Problems: Filters, Coils, and Vents

Airflow issues are the number one reason for weak cooling.

• Clogged filter. A cheap filter can load up fast in pollen season.
• Dirty evaporator coil. Dust and biofilm on the indoor coil act like a blanket.
• Blocked returns or closed vents. The system cannot move enough air across the coil.

What to do now

1. Replace the filter. Choose the right MERV for your system. Many Florida homes do well with MERV 8 to 10.
2. Open all vents and clear returns.
3. If cooling is still poor, schedule a coil cleaning. The evaporator coil sits inside the air handler and needs a pro to clean it safely.

Why it matters in Florida

• Long run times plus humidity encourage dust to stick to the coil.
• Closed interior doors can starve returns of airflow in smaller homes.

Low Refrigerant or a Refrigerant Leak

Your system does not use up refrigerant. If it is low, there is a leak.

Signs you may have a leak

• AC runs constantly and vents feel lukewarm.
• Ice on the refrigerant lines or on the indoor coil.
• Hissing near the coil or condenser, or oily residue on connections.

Why it is risky

• Running low on refrigerant can overheat the compressor. That is a costly repair.

Professional steps

• Pressure testing and leak detection with instruments.
• Repairing the leak, then weighing in the correct charge to factory specs.
• Testing superheat and subcool to confirm proper operation.

Frozen Evaporator Coil

A frozen coil blocks airflow and stops cooling.

Common triggers

• Dirty filter or coil.
• Low refrigerant charge.
• Blower motor running too slow.

What to do now

1. Turn the system Off. Set Fan to On to thaw the coil.
2. After thawing, replace the filter and try cooling.
3. If ice returns, call a pro. You likely have a charge or blower issue.

Outdoor Unit Problems: Dirty Coil, Failing Fan, or Capacitor

Your outdoor condenser must release heat to the outside air.

• Dirty condenser coil. Grass clippings and lint clog the fins.
• Weak fan motor. The fan may spin but not at full speed.
• Bad capacitor. The motor struggles to start or stalls.

DIY steps

• Gently hose off the condenser coil from the inside out if you can access it safely. Power off first at the disconnect.
• Keep 2 to 3 feet of clearance around the unit.

When to call

• If you hear humming, grinding, or see the fan slow or stop, schedule service. Electrical parts store dangerous charge and need pro handling.

Thermostat, Sensor, or Control Board Issues

If controls are confused, cooling will not keep up.

• Misplaced thermostat in a hot hallway or in direct sun.
• Faulty sensor or miscalibration.
• Aging control board that drops the cooling call.

Fixes

• Relocate the thermostat to a central interior wall.
• Calibrate or replace the thermostat.
• Test low-voltage circuits to confirm the board’s performance.

Condensate Drain Problems in Humid Homes

High humidity grows algae in the drain line. A full pan can trip the float switch and shut down cooling.

What you can do

• If safe, pour a small amount of distilled vinegar into the cleanout to break down slime.
• If water backs up again, schedule a pro cleaning and drain line vacuuming.

Pro tip for Florida

• Regular drain flushing keeps summer storms and humidity from teaming up to flood the pan.

Duct Leaks, Hot Attics, and Uneven Rooms

If ducts leak or are undersized, cold air never reaches the rooms.

Symptoms

• Some rooms are fine while others stay muggy.
• Dusty returns and high energy bills.

Solutions

• Duct inspection with static pressure readings.
• Sealing and correcting crushed or kinked runs.
• Adding returns in closed-off rooms when needed.

System Size and Florida Heat Loads

An undersized system runs nonstop and never catches up. An oversized system may short cycle and leave humidity high.

Clues

• Fast temperature swings.
• Sticky air even when the thermostat hits set point.

Fix

• A proper load calculation and equipment sizing by a licensed contractor. In Central Florida, humidity control is as important as temperature.

Heat Pumps and Ductless Mini-Splits

If you have a heat pump or ductless system, cooling issues follow the same root causes with a few extras.

Heat pumps

• Reversing valve or defrost control issues can hurt cooling.
• Outdoor coil must be very clean to reject heat.

Ductless mini-splits

• Dirty indoor cassettes and clogged filters quickly reduce capacity.
• Drain clogs in wall cassettes are common in humid months.

What a Professional Diagnostic Visit Includes

When you schedule AC repair with Del-Air, we start by asking detailed questions about your comfort issues and equipment history. On site, we complete a full inspection to find the root cause.

Our diagnostic checklist

1. Verify thermostat settings and operation.
2. Inspect the air filter and airflow across the coil.
3. Check refrigerant levels and look for leaks.
4. Test electrical connections, capacitors, contactors, and motors.
5. Clean or clear the condensate drain and pan.
6. Inspect evaporator and condenser coils for dirt and damage.
7. Measure static pressure and assess duct condition.
8. Test system performance under normal operating conditions.

What happens next

• We explain our findings in clear language and present your options.
• You get upfront pricing before any work begins.
• After approval, we complete the repair, retest the system, and clean the work area.

Repair or Replace: How to Decide

Not every no-cool situation needs a new system. Here is a smart way to choose.

Consider these factors

• Age of equipment. Over 12 years old and facing a major repair may justify replacement.
• Cost of the repair. If repair cost is more than 30 percent of a new system and the unit is older, consider replacement.
• Refrigerant type. Older units using legacy refrigerants may be costly to keep.
• Comfort and humidity. If the home still feels sticky, right-sizing may fix both temperature and moisture.

Del-Air can provide free estimates on replacements and offer financing. We also give you a condition and efficiency analysis after repairs so you can plan with facts.

Preventive Maintenance to Avoid No-Cool Emergencies

Routine tune-ups catch small problems before they shut down cooling in July.

What our tune-up covers

• Calibrating and inspecting the thermostat.
• Cleaning and checking the evaporator coil for proper absorption.
• Examining and cleaning the drain pan.
• Inspecting the blower motor and wheel for wear and tear.
• Testing the drain line.
• Evaluating air filters and replacing them if necessary.
• Measuring and adjusting refrigerant levels.
• Inspecting the fan motor.
• Cleaning condenser coil.
• Verifying proper electrical connections.

Why this matters in Central Florida

• Daily humidity supports algae in drain lines.
• Afternoon storms can cause power surges that weaken capacitors.
• Salt air near the coast speeds corrosion. Extra coil care helps.

Membership Benefits That Lower Repair Costs

A Del-Air Maintenance Agreement keeps your system efficient and helps prevent costly breakdowns.

Highlights

• Two scheduled maintenance visits annually.
• One on-demand plumbing and electrical visit.
• Flushing and vacuuming your drain line.
• Free diagnostics with service visits.
• 15 percent off AC, plumbing, or electrical repairs.
• $500 off AC and heating system installation.
• And much more.

Members also get priority scheduling and reminders that help meet manufacturer warranty requirements through documented tune-ups.

Florida-Specific Troubleshooting Tips

• After a thunderstorm, check breakers and thermostat power. Surges can flip them.
• If your outdoor unit is near landscaping, trim shrubs to keep airflow clear.
• In older North Orlando homes, add a return in closed-off rooms to improve airflow.
• If you see ice, always thaw before restarting. Do not run the compressor while frozen.

When to Call for Professional Help

Call a licensed pro if you notice any of these:

• Ice returns after a filter change and thaw.
• Breaker trips again after one reset.
• Burning smells, strong buzzing, or visible arcing.
• Water around the air handler or ceiling stains.
• Short cycling, high humidity, or rooms that never cool.

Del-Air offers same-day service and 24/7 emergency repairs to get cooling back fast. We service all brands and bring common parts to finish most jobs on the first visit.

What You Can Expect From Del-Air

• Clear communication. We explain the problem and your options in plain language.
• Upfront pricing. No surprise bills.
• Prepared technicians. We arrive with likely parts and tools.
• Post-repair testing. We verify performance under normal conditions.
• Clean workmanship. We respect your home and clean up before we leave.

Two hard facts you can count on

• We have served Florida homeowners since 1983 and are the largest residential HVAC company in the state.
• We are fully licensed, bonded, and insured. Licenses: EC13013085, CAC1822274, CAC051477, CFC057524.

Cost Guide: Common Repairs That Restore Cooling

Every home and system is different, but these repairs often fix the no-cool problem.

• Capacitor or contactor replacement. Restores motor starting and condenser operation.
• Condensate drain cleaning and float switch reset. Stops safety shutoffs.
• Coil cleaning. Improves heat transfer and airflow.
• Refrigerant leak repair and recharge. Restores capacity and protects the compressor.
• Blower or condenser fan motor replacement. Fixes weak airflow and overheating.

Ask about financing for larger repairs and free estimates if replacement is the smarter investment.

Simple Habits to Keep Your AC Cooling

• Change filters every 30 to 60 days during peak season.
• Keep 2 to 3 feet of clearance around the outdoor unit.
• Rinse the condenser coil gently once each spring.
• Pour a little vinegar into the drain cleanout monthly.
• Leave interior doors cracked to help returns pull air evenly.
• Schedule spring and fall tune-ups to stay ahead of heat and humidity.

Special Offers to Fix No-Cool Fast

• Special Offer: FREE Service Call with Paid A/C Repair. Use code NCFSC.
• Special Offer: FREE Trip Charge with Paid Repair. Valid through Jun 30, 2026. Terms and conditions may apply.
• Seasonal Tune-Up: $79 Comprehensive A/C Tune-up on select service-area pages.

Call (407) 768-4694 or schedule at https://www.delair.com/orlando-north/ and mention NCFSC to redeem the free service call offer.

What Homeowners Are Saying

"Noah took his time to diagnose and solve my A/C problem. He was polite and professional. Turns out it was just a clogged line with no major repair or replacement needed. I have used Del-Air for all my AC repairs and replacements. You can trust them to fix the problem, and not try to sell you something that you do not need."
–Toni K., AC Repair

"Our AC stopped working in the middle of July. Del Air was able to get me same day service to repair. Other firms were two days out. The Del Air tech was Rocco and he quickly identified and fixed the issue. He was patient and answered all our questions. Based on the great customer service, I signed up for their maintenance service and down the road when need a new AC, we are calling Del Air."
–Doug J., AC Repair

"I moved into a brand new house where Del-Air had installed the air conditioner. I eventually encountered an issue with my cooling system. I called Del-Air in the evening and I was relieved they could dispatch someone the next morning. My technician, Peterson Isaac arrived right on schedule. He diagnosed the problem... and completed the necessary and somewhat tedious repair. Further, he made certain that all other components were working perfectly, and gave me a crash course in ac maintenance. Wow, what exceptional service!"
–Jane L., AC Repair

"Today, I had Jamar Hallman come to my house and completely fix our AC unit. He was thorough and professional... Because of his kind personality, thoroughness, and professionalism, we decided to go with a maintenance plan for all of our three different units."
–Mark V., Maintenance Plan

Frequently Asked Questions

Why is my AC running but not cooling after I changed the filter?

If cooling does not return, the evaporator coil may be dirty or frozen, or you could be low on refrigerant. Try thawing if you see ice. If problems persist, schedule a diagnostic visit.

Can low refrigerant damage my AC?

Yes. Low refrigerant can overheat the compressor. That is a costly repair. A licensed tech should find and fix the leak, then recharge to the correct level.

How often should I clean the outdoor condenser coil in Florida?

Rinse gently each spring and trim plants so you have 2 to 3 feet of clearance. Schedule a professional cleaning if the fins are matted with dirt.

What temperature should I set in summer to avoid nonstop running?

Most homes do well at 75 to 78 degrees with the fan on Auto. In peak heat, expect longer run times. Good airflow and a clean coil help the system keep up.

Do maintenance plans really prevent no-cool emergencies?

Yes. Regular tune-ups catch weak capacitors, clogged drains, and dirty coils before they shut down cooling. Members also get priority scheduling and repair discounts.

The Bottom Line

If your AC is running but not cooling, start with airflow, drains, and thermostat checks. In Central Florida, humidity, algae, and long run times make these issues common. When DIY steps do not restore cooling, call a licensed pro. Del-Air offers same-day service, 24/7 support, and upfront pricing to get you comfortable fast.

Ready to Get Cold Air Back?

Call (407) 768-4694 or book online at https://www.delair.com/orlando-north/ for fast AC repair in Orlando, Deltona, Sanford, and nearby areas. Mention code NCFSC for a FREE Service Call with paid A/C repair. Prefer no phone tag? Schedule now and choose same-day or after-hours service. We will diagnose the issue, present clear options, and get your home cool again today.

About Del-Air Heating, Air Conditioning, Plumbing and Electrical

Serving Florida homes since 1983, Del-Air is the state’s largest residential HVAC team. We deliver same-day service, 24/7 emergency response, and upfront pricing. Our licensed, bonded, and insured technicians service all brands. We offer free estimates on replacements and friendly financing. Licenses: EC13013085, CAC1822274, CAC051477, CFC057524. From AC repair and ductless systems to plumbing and electrical, we keep your home running right with one trusted provider and a customer-first approach.