AC Not Cooling in Glenview? A Homeowner's Troubleshooting and Cost Guide

Most air conditioning failures in the Chicago area announce themselves on the first genuinely hot day, when a system that coasted through a mild June gets asked to work and can't. This guide covers what you can safely check yourself, what each repair costs in 2026, and one change most homeowners haven't heard about that has made a single category of AC repair dramatically more expensive than it was three years ago.

A note on scope before you start: air conditioning has two hazards that heating doesn't, and both of them are genuinely serious. Capacitors hold a potentially lethal electrical charge even after the power is off. Refrigerant is federally regulated and cannot legally be handled without certification. We'll be specific about where the DIY line sits, and it sits earlier than a lot of internet advice suggests.

1. Where DIY stops on an AC system

Two more situations to treat as calls rather than projects: a breaker that trips repeatedly when the AC starts, and a burning or hot-electrical smell from either unit. Both are reporting a real electrical fault, and resetting past them is how small problems become fires.

2. Six safe checks before you call

These involve no tools, no panels, and no electrical contact. They resolve a meaningful share of "the AC is broken" calls.

Check 1 — Thermostat settings

Confirm it's set to COOL, that the target is at least a few degrees below the current room reading, and that the fan is on AUTO rather than ON. A fan set to ON blows continuously between cooling cycles, which feels like the AC is running and producing warm air — a very common false alarm.

Replace the batteries if the display is dim or blank. Check for a schedule or vacation hold left over from a trip.

Check 2 — Both breakers

Central air typically has two circuits: one for the indoor air handler and one for the outdoor condenser. People check one and stop. Look for both, and reset any that are tripped — once. If it trips again immediately, stop and call.

There's also usually an outdoor disconnect box mounted on the wall near the condenser. If someone has been doing yard or electrical work, it's worth confirming it's engaged.

Check 3 — The air filter

Same part, same failure as in heating season, but summer consequences are worse. Restricted airflow across the evaporator coil drops its temperature below freezing, and the coil ices over. Once iced, the system blows warm air no matter how well everything else works.

If you can't see light through the filter, replace it.

Check 4 — Look for ice

Check the copper refrigerant lines where they enter the indoor unit, and the coil itself if visible. Ice anywhere means shut the system off.

Set the thermostat to OFF and the fan to ON — this runs air over the coil and thaws it faster. Allow several hours, sometimes overnight. Running a frozen system can damage the compressor, which is the single most expensive component in the whole assembly.

Ice is a symptom, not a cause. It means restricted airflow or low refrigerant, and if it returns after thawing, that's the actual problem.

Check 5 — Clear the outdoor unit

The condenser sheds heat to outside air, and it can't do that buried in cottonwood fluff, grass clippings, or leaves. Look at the fins: if they're matted with debris, gently rinse from the outside with a garden hose — normal pressure, never a pressure washer, which bends fins flat and makes things worse.

Keep about two feet of clearance on all sides. Shrubs and fence extensions that grew in over a couple of seasons are a common and invisible cause of gradually worsening performance.

Check 6 — The condensate drain

Air conditioning pulls a lot of water out of humid Midwest air, and that water drains away through a line and often a pump. When the line clogs with algae, a float switch shuts the system down to prevent an overflow — by design.

Look for standing water near the indoor unit or a full pump reservoir. A clogged drain line is a quick professional fix and a common mid-August shutdown.

3. Diagnosing by symptom

Outdoor unit won't start, indoor fan runs

Most often a failed capacitor or a burned contactor. The classic capacitor signature is a hum from the condenser with the fan not spinning, or a fan that starts if nudged — which is a diagnosis, not a repair. Both parts are inexpensive relative to the rest of the system.

Running constantly but not cooling

Suspect low refrigerant from a leak, a dirty condenser coil, or a failing compressor. If the outdoor unit is hot to the touch and the air coming off it isn't warm, the system may not be moving heat at all.

Blowing warm air

After the thermostat fan check: frozen evaporator coil, low refrigerant, or the outdoor unit not running at all while the indoor blower continues. Step outside and confirm whether the condenser is actually spinning — people often diagnose from inside the house.

Short cycling

Starting and stopping every few minutes points to restricted airflow, an oversized system, a failing capacitor, or refrigerant issues. Hard on the compressor and worth addressing rather than tolerating.

Noises

• Hum with no fan movement — capacitor, most likely.
• Loud metallic clanking — something loose in the fan assembly. Shut it off before it destroys more.
• Screeching — motor bearings or, on older units, compressor pressure.
• Hissing or bubbling — possible refrigerant leak. Worth prompt attention for reasons section 5 covers.
• Clicking that repeats without a start — usually a relay or contactor failing to engage.

Water around the indoor unit

Usually a clogged condensate drain or failed pump. Sometimes a thawing frozen coil producing more water than the drain can carry. Not typically urgent for the equipment, but it damages floors and drywall, so don't leave it a week.

4. What AC repairs cost in 2026

National ranges compiled from published 2026 data. Chicago-area labor runs in the upper half; North Shore pricing above Chicago proper.

The average AC repair runs about $360, with most falling between $150 and $650. Complex repairs run $650 to $2,500 and up.

Before parts: diagnostic or service call fees run $75 – $200, standard labor $75 – $150 per hour, and emergency or after-hours $160 – $250 per hour. Ask whether the diagnostic fee is credited toward an approved repair — many companies credit it, some don't.

5. Why a refrigerant leak costs so much more now

This is the section worth reading even if your AC is currently fine, because it changes how you should think about a leak.

Under the federal AIM Act, HFC refrigerants are being phased down on a production schedule — not banned, but progressively restricted. Manufacture of new R-410A residential equipment ended January 1, 2025, and supply quotas tighten annually through 2036.

The practical consequence for anyone with an existing R-410A system is price:

So if you have a leak, the fix is finding and repairing the leak — or replacing the system — rather than recharging indefinitely. Ask any technician who quotes a recharge whether they performed a leak search, and what they found. A recharge without a leak diagnosis is treating a symptom you'll pay for again next July at a higher price.

What replaced it

New equipment now ships with R-454B (branded Puron Advance or Opteon XL41), which has a global warming potential of 466 against R-410A's 2,088 — roughly a 78% reduction.

The critical detail: R-454B is not drop-in compatible. You cannot convert an R-410A system by swapping refrigerant. It requires new equipment designed for it, with A2L-rated components and leak detection, because R-454B is mildly flammable where R-410A was not.

6. What this changed about Glenview permits

Here's where the refrigerant transition collides with local rules in a way that catches people out.

The Village of Glenview does not require a permit for removing and replacing HVAC equipment with the same type, size, and location, without modifications to exhaust venting. A permit is required when type, size, or location changes.

Before 2025, a failed condenser was a clean like-for-like swap: pull the old R-410A unit, set a new R-410A unit on the same pad, same size, same location. No permit.

That path is closing. With new R-410A equipment no longer manufactured, replacing a failed condenser increasingly means moving to R-454B — and because that refrigerant isn't compatible, you can't replace only the outdoor unit. The indoor evaporator coil has to be a matched R-454B component too. What used to be a one-box swap is now a two-component change to different equipment.

Two questions worth asking any contractor quoting a condenser replacement: is the indoor coil included and matched, and are you pulling a permit for this scope. A quote for an outdoor unit alone, on a system changing refrigerant, is either incomplete or describing work that won't perform properly.

7. Repair or replace

Central air typically lasts 12 to 17 years in the Chicago climate, helped by the fact that it sits idle more than half the year.

Lean toward replacement when

• The compressor has failed on a unit past 10 years. Compressor replacement runs $600–$2,500 and is a large fraction of a new system.
• There's a significant refrigerant leak in an R-410A system past 8–10 years. Repair plus recharge can approach $2,000, and you're investing in a refrigerant that gets more expensive every year.
• The evaporator coil has failed — $1,000–$4,500, and on an aging system a new coil won't match a future condenser.
• You're facing repeated repairs across consecutive summers.

Lean toward repair when

• The unit is under 10 years old and has been maintained.
• It's a discrete component — capacitor, contactor, fan motor, drain line.
• The repair is under roughly 30% of replacement cost.
• You're selling within a year or two and the system works.

If you're weighing this on the heating side too, our furnace troubleshooting guide covers the equivalent math for furnaces, and the furnace replacement cost guide covers what a new heating system runs. Worth reading together, because AC and furnace share the indoor cabinet and the ductwork — replacing both at once is usually cheaper than two separate jobs a few years apart.

8. Replacement costs and SEER2

Central air replacement runs roughly $4,500 to $9,500 installed for most homes, with the typical job landing near $6,500. By size:

Labor is roughly 40–60% of the total. Common additions: line set replacement $300–$800, electrical or disconnect work $150–$1,500, permits and inspection $100–$500, ductwork or sealing $1,000–$5,000.

On efficiency: moving to SEER2 16 adds roughly $1,000–$2,500 over baseline, and premium SEER2 18+ can add $3,000 or more. In the Chicago climate, where the cooling season is genuinely short, the payback on premium efficiency is slower than in southern markets — the equipment simply doesn't run enough hours to recover the premium quickly. Mid-tier is usually the sensible stopping point here.

The minimum standard for the North region, which includes Illinois, is 13.4 SEER2 (equivalent to 14.0 SEER). Compliance is determined by manufacturing date rather than installation date, so existing lower-efficiency stock manufactured before the standard took effect can still legally be installed.

9. Preventing next summer's failure

Spring tune-up, booked early

Have the system serviced annually before cooling season — ideally April or early May. A tune-up catches a weak capacitor, a dirty coil, or a slow refrigerant leak while it's still cheap and while technicians are available. Once the first 90-degree stretch hits, maintenance appointments queue behind emergency no-cooling calls.

Filters

Check monthly during cooling season; replace every 1–3 months for one-inch filters. Avoid jumping to the highest-MERV filter available — very restrictive filters reduce airflow across the evaporator coil, which is precisely what causes it to freeze.

Keep the condenser clear

Two feet of clearance, no stacked firewood or patio furniture against it, and don't let landscaping close in over a season or two. Rinse the fins gently each spring, especially during cottonwood season, which coats condensers across the North Shore in a few weeks every year.

Watch the drain line

If yours has an accessible cleanout, a cup of distilled vinegar poured through it at the start of the season discourages algae growth. Cheap insurance against an August shutdown.

Deal with leaks properly the first time

Given section 5, this one now carries real money. A system that needs refrigerant every season has a leak, and the annual cost of ignoring that is rising. Have it found.

10. Frequently asked questions

Common causes are a frozen evaporator coil, low refrigerant from a leak, or the outdoor condenser not running while the indoor blower continues. Check the thermostat fan setting first — set to ON rather than AUTO, it circulates air between cooling cycles and feels like warm air from a running system. Then step outside and confirm the condenser fan is actually spinning.

The average is about $360, with most repairs between $150 and $650. A capacitor runs $100–$250, a contactor $200–$450, a condenser fan motor $200–$700, and a compressor $600–$2,500. Diagnostic fees run $75–$200 and standard labor $75–$150 per hour, with emergency rates of $160–$250 per hour.

R-410A refrigerant is being phased down under the federal AIM Act, and manufacture of new R-410A residential equipment ended January 1, 2025. A typical 3–5 pound recharge that cost $150–$300 in 2023 runs $300–$750 in 2026, with prices climbing 15–20% annually. If your system needs refrigerant repeatedly, it has a leak, and repeated recharging is now considerably more expensive than it used to be.

No. R-410A is not illegal and existing systems are not affected — they remain fully operational and serviceable, and refrigerant is still available. What ended on January 1, 2025 was the manufacture of new R-410A residential equipment. You are not required to replace a working system.

No. R-454B is not drop-in compatible. It requires equipment designed for it, including A2L-rated components and leak detection, because it is mildly flammable where R-410A was not. Converting means new equipment, and because the indoor coil must be matched, it means both the outdoor condenser and the indoor evaporator coil.

Not for a true like-for-like replacement — the Village of Glenview does not require a permit when equipment is replaced with the same type, size, and location without venting modifications. However, because new R-410A equipment is no longer manufactured and R-454B requires a matched indoor coil, condenser replacements increasingly involve a change of equipment type and therefore need a permit. Mechanical permits covering a/c units are eligible for same-day review.

It is not recommended. Capacitors store a high-voltage charge that persists after power is shut off at the breaker, and contact with the terminals can cause serious injury or death. Safe replacement requires knowing how to discharge the component and having a meter to verify it. Turning off the breaker is not sufficient protection.

Turn the system off immediately. Set the thermostat to OFF and the fan to ON, which moves air over the coil and speeds thawing; allow several hours or overnight. Running a frozen system risks damaging the compressor, the most expensive component in the system. Ice indicates restricted airflow or low refrigerant, so if it returns after thawing, that underlying cause needs diagnosis.