HVAC Technicians | Licensed Electricians | Certified Inspectors
Written by Peter
Master Electrician at PRO Electric plus HVAC, serving Fairfax, Loudoun, Arlington, and Prince William Counties. Virginia License #2705181607.
Beat the Heat Before It Beats You. Get Your AC Tune-Up Now.
A complete inspection, cleaning, and optimization that prevent breakdowns, lower your bills, and keep you cool all summer.
Hi, I am Peter, the Master Electrician at PRO Electric plus HVAC. When a heat wave rolls through Fairfax, Loudoun, Arlington, and Prince William, the phone does not stop, because that is exactly when air conditioners quit. Heat and humidity push a system to its limit, and any weak part that was hanging on through spring finally gives out on the hottest afternoon of the year.
What makes us different is what we are: a single team of HVAC technicians, licensed electricians, and certified inspectors. That matters more than it sounds, because a huge share of AC failures are not mechanical at all. They are electrical, a failed capacitor or contactor, a tripping breaker, a corroded connection. Most AC companies cannot chase an electrical fault, and most electricians do not touch refrigerant. We do both, so we find the real cause the first time instead of guessing. Below I will walk through every problem people type into Google and ask their AI assistant at two in the morning when the house will not cool, what is actually happening, and what you can safely check yourself.
“My AC is running but blowing warm air and not cooling”
This is the most common search of the summer, and it has a long list of possible causes. The outdoor unit might be caked in dirt and grass clippings, so it cannot release heat. The system might be low on refrigerant from a slow leak. A failed run capacitor or contactor might be keeping the compressor from starting while the fan still runs. The air filter might be filthy, choking airflow. The evaporator coil might be frozen. Or the ductwork might be leaking cooled air into your attic instead of your rooms.
Try this first: Check that the thermostat is set to cool and below room temperature, replace a dirty air filter, and make sure the breaker for the AC is on. If the outdoor unit is buried in debris, gently rinse the fins with a hose. If the air is still warm after that, the cause is inside the sealed system or the electrical components, and it is time for professional air conditioning repair.
“There is ice on my AC and the lines are frozen”
People are always surprised to find ice on an air conditioner in July, but a frozen evaporator coil or an iced-up refrigerant line is one of the calls we run most. There are really only two root causes. The first is restricted airflow, usually a clogged filter, a dirty coil, or a weak blower, which lets the coil get so cold that condensation freezes solid. The second is low refrigerant from a leak, which drops the pressure and temperature until ice forms.
Here is the part that matters: do not keep running a frozen unit. You can burn out the compressor, which is the single most expensive part in the system. Turn the AC off at the thermostat, switch the fan to on to help it thaw, and replace the air filter. If it ices up again after thawing, that points to a refrigerant leak, and a leak needs a licensed technician to find and seal, not a can of refrigerant poured in to mask it.
“My AC keeps tripping the breaker”
This is where wearing both hats really pays off, because a tripping AC breaker is an electrical symptom of a problem that could be electrical or mechanical. A dirty, overheating condenser makes the compressor pull more amps than the circuit allows, and the breaker trips to protect the wire. A failing capacitor or a compressor that struggles to start does the same thing. So can a loose or corroded connection at the disconnect, an aging breaker that has weakened, or a wiring fault.
A safety word from the electrician in me: If your AC trips the breaker once, you can reset it a single time. If it trips again, stop. A breaker that keeps tripping is reporting a real fault, and forcing it closed over and over is how electrical fires start. Because we are licensed electricians and HVAC technicians on the same truck, we can measure the actual amp draw, test the capacitor and contactor, and check the wiring, so you find out whether you need an electrical fix or an AC fix instead of paying two companies to point fingers.
“The outside unit is humming but the fan is not spinning”
When the outdoor unit makes a humming sound but the top fan sits still, the culprit is almost always a failed run capacitor. The capacitor is the small electrical part that gives the motors the jolt they need to start, and it is one of the most common AC repairs there is. It is also an inexpensive part when it is caught on its own. Please do not try to push the fan blade with a stick to get it going, which I have seen go badly. Shut the unit off so the motor does not overheat, and have the capacitor and contactor tested and replaced.
“My AC will not turn on at all”
When nothing happens, work from simple to complex. A thermostat with dead batteries or a blank screen cannot call for cooling. A tripped breaker or a blown low-voltage fuse cuts the signal. A clogged condensate drain can trip a safety float switch that shuts the system down on purpose to prevent water damage. The outdoor disconnect might be pulled. And a dead capacitor can keep everything silent. Check the thermostat, the breaker, and whether water is pooling near the indoor unit. If those look fine, the fault is deeper in the controls or the electrical side.
“There is water leaking around my furnace or indoor unit”
Your AC pulls humidity out of the air, and that moisture is supposed to drain away. When you see water on the floor, the condensate drain line is usually clogged with algae and gunk, so it backs up and overflows. A coil that froze and then thawed will also dump water, and a rusted-through drain pan will leak. Left alone, this damages floors and ceilings and can trip the system off entirely. A drain line clearing is a normal part of a good tune-up, which is one more reason routine service pays for itself.
“My AC keeps turning on and off” (short cycling)
Short cycling, where the system starts and stops every few minutes, wears parts out fast and never properly cools or dehumidifies the house. Common causes are a dirty filter, low refrigerant, a thermostat in a bad spot reading the wrong temperature, an electrical control problem, or a unit that was oversized for the home and cools too fast in short bursts. It is worth diagnosing quickly, because the constant starting is hard on the compressor.
“Some rooms are cold and others are hot” (weak airflow)
Uneven cooling and weak airflow usually trace back to a dirty filter, a struggling blower, leaky or undersized ductwork, closed or blocked vents, or that frozen coil again. In a lot of Northern Virginia homes, the ducts in the attic leak a surprising amount of cooled air before it ever reaches the far bedrooms. A certified inspection of the airflow and ducts tells you whether you have an equipment problem or a delivery problem.
“My AC runs all day and the house still will not cool on the hottest days”
On a 98 degree afternoon with high humidity, even a healthy system has to work hard, because central AC is designed to pull the indoor temperature down roughly 20 degrees below outside, not to make a sauna feel like a refrigerator. That said, if your AC truly cannot keep up, the usual reasons are a low refrigerant charge, a dirty system, an aging unit that has lost capacity, leaky ducts, or a system that was undersized for the home. Humidity plays a big role too, since damp air feels hotter. A system that is cleaned, charged correctly, and running at full capacity makes a real difference when the heat peaks.
“Why is my summer electric bill so high?”
A struggling air conditioner is often the answer. A dirty condenser, a low refrigerant charge, leaky ducts, and an aging low-efficiency unit all force the system to run longer and pull more power to deliver the same cooling. When the AC runs nearly nonstop through a heat wave, that shows up fast on your Dominion bill. A clean, properly charged, well-tuned system cools faster, runs less, and costs less to operate, which is a big part of why a tune-up pays for itself over a summer.
“Should I repair or replace my air conditioner?”
This is the honest conversation, and we will always give you the straight version rather than the expensive one. A few things tip the scales toward replacement.
- Age. Most central AC systems last about 12 to 15 years. Past that, repairs add up and efficiency drops.
- Older refrigerant. Systems that still use the old R-22 refrigerant are expensive to recharge, since it has been phased out. A big leak on an R-22 unit often means it is time.
- Repair cost versus value. When a single repair approaches half the cost of a new system, replacement usually makes more sense.
- Frequent breakdowns. If you are calling for repairs every summer, you are renting reliability you could own.
- Comfort and humidity. A right-sized modern system cools more evenly and pulls humidity better, which matters a lot in our climate.
If repair is the smart call, we fix it and get you cool. If replacement truly serves you better, we say so and explain why. Either way, you get the facts.
How a tune-up prevents almost all of this
Nearly every problem above starts small and gets discovered during a heat wave, at the worst possible moment, when it has already become an expensive emergency. A spring or early summer tune-up catches those weak points while they are still cheap and while you are still comfortable. Here is what a complete PRO Electric plus HVAC tune-up covers.
- Inspect and clean the condenser and evaporator coils so the system can shed heat
- Check the refrigerant charge and look for signs of a leak
- Test the capacitor and contactor, the two parts most likely to fail in our heat
- Tighten and inspect the electrical connections and measure the amp draw
- Clear the condensate drain line so it cannot back up and flood
- Check and replace the air filter and verify airflow
- Calibrate the thermostat and confirm the cooling cycle
- A certified inspection of the whole system, electrical and mechanical
Because the same visit is performed by people licensed in both trades, we catch the electrical issues an AC-only company would miss and the refrigerant issues an electrician would never touch. That is the difference between a checklist and a real inspection.
A real safety note about the heat
Do not tough out a dangerous heat wave with a dead AC. High heat and humidity are hard on everyone and genuinely risky for older adults, young children, and pets. If your system is down during extreme heat, get somewhere cool and call us for fast service. And remember, an AC that keeps tripping the breaker should be shut off, not repeatedly reset.
Why homeowners across Northern Virginia call us
We are HVAC technicians, licensed electricians, and certified inspectors, fully licensed in Virginia, and we work across Fairfax, Loudoun, Arlington, and Prince William Counties from our offices in Falls Church and Fairfax. When your AC quits, you do not have time for a company that can only see half the picture. We diagnose the mechanical and the electrical side together, fix it right, and tell you the truth about repair versus replacement. For anything beyond a filter change, our air conditioning repair team is ready to get you cool again.
Beat the Heat Before It Beats You.
Book your AC tune-up and stay cool all summer across Fairfax, Loudoun, Arlington, and Prince William.