DIY AC Repair: What You Can and Cannot Do
By Coastal Air Plus | Serving Myrtle Beach and Charleston, SC Since 1947
We get it. Energy bills are high and the instinct to fix things yourself makes total sense. We are going to be straight with you on this, because we think you deserve an honest answer more than a protective one. Yes, there are things you can do yourself to keep your AC running and to troubleshoot basic problems.
There are also things that require a licensed technician, not better than every company at every job, just different in that we look at each situation one at a time. You will not be oversold when you call and are not trying to protect our business, but because of safety, legal requirements, and the real risk of turning a small problem into an expensive one. Homeowners in Myrtle Beach and Charleston ask us this regularly. Here is the honest breakdown.
What You CAN Do Yourself
- Change the air filter. This is the single most impactful maintenance task a homeowner can do. Check it monthly. Replace it when it is visibly dirty. Use a MERV 8 to 11 filter for most homes. A clogged filter reduces airflow, reduces efficiency, and can cause the evaporator coil to freeze. This is yours to own.
- Clear debris from around the outdoor unit. Keep grass, shrubs, and debris at least two feet from all sides of the outdoor unit. Clear leaves and debris off the top of the unit. Rinse the exterior of the coil with a garden hose if it is visibly clogged with debris. Do not use a pressure washer.
- Clear the condensate drain. If you have a PVC drain line coming out of your air handler, you can flush it periodically with a cup of distilled white vinegar. This inhibits algae growth and keeps the drain clear. On the South Carolina coast, we recommend doing this every two to three months during AC season.
- Check and reset the circuit breaker. If your AC is not running, check the breaker. A tripped breaker can be reset once. If it trips again, stop and call a technician. A breaker that keeps tripping is protecting you from something and should not be forced.
- Replace the thermostat batteries. If your thermostat is unresponsive, check the batteries first. A surprising number of service calls involve a thermostat that just needed fresh batteries.
- Troubleshoot thermostat settings. Confirm the thermostat is set to cool, the fan setting is on auto, and the target temperature is below the current room temperature. These are basic but often overlooked.
What You CANNOT Do (And Why)
- Handle refrigerant. This is the big one. Under Section 608 of the Clean Air Act. We have more detail on refrigerant regulations and recent SEER changes in a dedicated post. If a frozen coil is what brought you here, our post on why your air conditioner freezes up covers the causes in full., handling refrigerants requires EPA Section 608 certification. It is not just industry convention. It is federal law. Purchasing refrigerant without certification is illegal, and attempting to recharge your own system without proper equipment can result in serious injury from high-pressure releases, overcharging that damages the compressor, or improper mixing of refrigerant types. If your system is low on refrigerant, call a licensed technician.
- Electrical repairs inside the unit. Capacitors hold dangerous charges even when the system is powered off. They can discharge enough current to cause serious injury. Contactor replacement, wiring repairs, and control board work should not be attempted without proper training and the correct tools to discharge capacitors safely.
- Compressor diagnostics and repair. The compressor is the heart of the system and the most expensive component to replace. Attempting to diagnose compressor issues without proper gauges and training is guesswork, and guesswork with a compressor is expensive. If you hear grinding or the outdoor unit is humming but not starting, call us.
- Ductwork repairs beyond accessible sections. Taping an accessible joint with proper mastic tape or foil tape is reasonable. Diagnosing and repairing ductwork in an attic or crawlspace without understanding airflow and pressure balance is not. Improper ductwork changes can reduce comfort throughout the whole house.
The Cost-Benefit Reality
We hear from homeowners regularly who attempted a repair, made the problem worse, and ended up paying more than if they had called us first. The most common version: low refrigerant leads to a frozen coil, homeowner lets it thaw, runs the system again without fixing the leak, compressor fails. A refrigerant top-off and leak repair at the beginning would have been a few hundred dollars. A compressor replacement is a different conversation.
Do what you can safely do yourself. It is good maintenance practice and we genuinely want you to stay on top of it. But know the line. Our techs take their time diagnosing rather than guessing, and we are always available for questions if you are not sure whether something is in your lane.
At Coastal Air Plus, creating lasting relationships is what we are all about. Think of it the way a neighbor who happens to know HVAC would tell you: you handle the filter, the drain, and the basics, and we handle the rest. That combination is what keeps systems running the longest. Rest easy knowing we are a phone call away when something falls outside the DIY category.
Call 843-238-3838 or visit coastalairplus.com/request-service. For EPA refrigerant handling regulations, see epa.gov/section608. Simple. Reliable. Coastal Air Plus.
