AC Repair in Crystal Lake, IL

Crystal Lake is one of McHenry County’s larger communities, and its neighborhoods reflect decades of residential growth layered on top of each other. You will find 1950s ranch homes sitting next to 1990s subdivisions and 2000s-era builds, all running different generations of cooling equipment. That range of home ages means a wide variety of system types and failure modes, and it takes technicians who have worked on all of them.

Leith Heating and Cooling has served homeowners throughout this region, including Crystal Lake, with NATE-certified technicians, upfront pricing, and a guarantee that we stand behind our work. If your AC is struggling or has stopped working entirely, we will come out, tell you what we find, and fix it the right way.

Our Services:

Contact Us

Full Name

Phone Number

Email Address

Address

City

Are you a new customer?

Inquiry about:

Message

By submitting this form and signing up for texts, you consent to receive text messages from Leith Heating & Cooling at the number provided, including messages sent by the auto dialer. Consent is not a condition of purchase. Msg & data rates may apply. Msg frequency varies. Unsubscribe at any time by replying STOP to 847-851-8698 or clicking the unsubscribe link (where available), and no further messages will be sent. Reply HELP for help. See Privacy Policy & Terms.

Why Homeowners in Crystal Lake, IL Trust Us

I called Leith and Jake came out to evaluate my house and make recommendations. He was informative, patient and kind as he sat and explained how the different systems operated. I was impressed with his knowledge base and his ability to use language I could understand in making a good decision for me. I will be highly recommending this team to friends, family and neighbors.

From Jake to Carl to Esteban what a great experience we had getting our new furnace and air conditioner installed. Jake explained in detail all of the appliances and how much everything would cost. Carl and Esteban were two of the most considerate installers we have ever encountered. very knowledgeable. They went above and beyond keeping our house clean. Thank you Leith for your excellent employees.

I remembered my sister used your company and loved your service so I called. Christian was here in less than an hour and worked hard to figure out our complicated heating problem in a hurry. He went above and beyond recognizing some other problems we had been dealing with for a while. Christian just took such good care of us, we will use Leith from now on.

We called Leith at 8AM and spoke to the owner, Brian, who took our relevant information. He was able to send out his service tech, Sean, who was here by 8:45 to do an inspection and to see if it was fixable. He evaluated the situation, provided and explained the merits of the three options. They were prompt, professional, patient with our questions and couldn’t have been nicer. Can’t say enough about the whole team - excellence all around.

We have used Leith for our HVAC checkups for few years. Our system was coming to the end of its life and decided to replace it. Leith was our first and only choice for the job. Esteban and Carl did a thorough and meticulous job on the installation and we were happy with the whole process. I would recommend Leith for their professionalism and ease to work with.

Common AC Problems We Fix in Crystal Lake

Crystal Lake sits at a slightly higher elevation than many Fox River communities, and its proximity to the lake creates local microclimates with elevated overnight humidity. That moisture, combined with summers that swing between dry heat waves and extended humid stretches, creates a specific wear pattern on residential cooling systems. These are the problems we encounter most frequently in Crystal Lake:

Frozen evaporator coils caused by restricted airflow through older ductwork that has not been updated to match system upgrades.
Refrigerant leaks that develop slowly over time on systems with aging line sets, often going undetected until efficiency drops noticeably.
Condenser unit failures from debris accumulation, particularly on homes with heavy tree cover common in Crystal Lake’s older neighborhoods near the lake.
Short cycling where the system turns on and off rapidly without completing a full cooling cycle, often caused by an oversized unit or a failing thermostat.
Drain line clogs from summer humidity that overtaxes condensate systems not sized for high-moisture conditions.
Fan motor failures on outdoor units that run continuously through extended heat events.

Catching these issues early in the season can prevent a straightforward repair from becoming a more expensive problem.

Emergency AC Repair in Crystal Lake

McHenry County summers deliver genuine heat, and Crystal Lake homeowners near the water can experience humidity spikes that make an already warm home feel unbearable quickly. When your AC stops working during a heat event, the window for comfortable conditions closes faster than most people expect.

We offer emergency AC repair because timing matters. Our technicians carry the parts most commonly needed on emergency calls, and we treat after-hours and weekend service calls the same way we treat any other job: arrive prepared, communicate clearly, and get your system back up as quickly as possible.

A Service Visit Near Crystal Lake's Main Beach Area

We received a call from Tom, who owns a two-story home near the Main Beach area of Crystal Lake that he purchased about eight years ago. He had noticed the system running almost constantly over a hot stretch in July without the upstairs ever getting below 78 degrees. His energy bills had climbed noticeably over the previous two summers but he had attributed it to hotter weather.

When we inspected the system, we found the condenser coils heavily fouled with cottonwood debris, which is extremely common in Crystal Lake properties near mature trees during late spring and early summer. The coil was cleaned, airflow was restored, and the system’s refrigerant charge was verified. Within a few hours of the visit, the upstairs had dropped to the set temperature for the first time in weeks. Tom mentioned the cottonwood issue had never been pointed out to him despite two previous service calls from another company.

Air Conditioner Parts We Repair and Replace

Crystal Lake’s mix of home ages means our technicians work on everything from older R-22 systems still running in homes that have not yet upgraded, to newer variable-speed equipment that requires more precise diagnostics. Whatever your system, here are the components we most often repair or replace:

Condenser and evaporator coils, including cleaning for cottonwood and debris accumulation that is particularly common near Crystal Lake’s wooded and lakeside properties.
Capacitors, contactors, and relays that handle startup and shutdown cycles throughout the cooling season.
Compressors on mid-life systems where replacement is cost-effective compared to a full system swap.
Refrigerant lines and fittings, particularly on older homes where original line sets have been in service for 20 or more years.
Drain pans, condensate lines, and float switches for moisture management during humid summer months.
Thermostats and control wiring that may be incompatible with system upgrades or have simply degraded over time.

We bring the parts we expect to need and quote everything before starting. No surprises on the invoice.

Ductless Mini-Split AC Services in Crystal Lake

Crystal Lake has a meaningful number of older lakeside homes and cottages that were built as seasonal properties and later converted to year-round residences. These structures were rarely designed with central HVAC in mind, and retrofitting ductwork into them is often impractical or prohibitively expensive. Ductless mini-split systems handle this situation well.

We install, repair, and maintain ductless systems for Crystal Lake homeowners. From lakeside conversions to sunrooms and home additions where the main duct system cannot reach, mini-splits provide efficient, direct cooling without major structural work. Our technicians will assess your space honestly and help you understand what a properly sized system can do for your comfort year-round.

Frequently Asked Questions

My AC keeps freezing up in Crystal Lake summers. What causes that?

Frozen coils almost always come from restricted airflow, low refrigerant, or both. In Crystal Lake, cottonwood debris clogging the condenser is also a common culprit that can indirectly cause freeze-ups by making the whole system work harder. A technician can identify the root cause and fix it.

How do I keep cottonwood from damaging my AC unit in Crystal Lake?

The best approach is to have the condenser coils cleaned every spring, especially if your property has mature trees nearby. You can also rinse the outside of the condenser unit with a garden hose periodically during heavy cottonwood season, but do not use a pressure washer. A professional cleaning catches what a rinse misses.

Is it worth repairing an R-22 AC system or should I replace it?

R-22 refrigerant is no longer manufactured, which makes recharging an R-22 system expensive. If your system has a refrigerant leak and still uses R-22, replacement is usually the more practical long-term choice. A technician can walk you through the cost comparison.

Why is my Crystal Lake home more humid inside than outside in summer?

That usually means the AC is not running long enough to remove moisture, which can happen when a system is oversized, short-cycling, or low on refrigerant. It can also mean a duct leak is pulling unconditioned humid air into the home. A diagnostic visit can identify which issue is driving it.

Do you service ductless mini-splits in Crystal Lake?

Yes. We install, repair, and maintain ductless systems throughout the area. Whether your mini-split is not cooling properly, showing an error code, or making unusual sounds, our technicians can diagnose and service it.