Palatine, IL:
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Libertyville, IL:
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Living near the lake means summers are breezy and cool. However, Illinois temperatures can fluctuate often, and living with lake-effect wind chills can turn cooler days into freezing ones. If you need expert HVAC services in Lake Forest, we can help. Allied Air Conditioning & Heating keeps you safe and comfortable at home all year.

Our HVAC Services

Allied Air Conditioning & Heating offers exceptional HVAC services in Lake Forest at unbeatable rates. Our NATE-certified technicians have the tools, training, and techniques to finish the job fast and efficiently. We offer various heating and cooling solutions for your HVAC system, such as heating, air conditioning, indoor air quality, and more.

HVAC technician using a Gauge to check Refrigerant Levels in an Air Conditioner in Lake Forest, IL


At Allied, our expert HVAC technicians take their time with every air conditioner and cooling system to ensure your home remains cool during the hottest times of the year. We do it all:

  • Lake Forest AC repair services
  • AC tune-ups
  • Air conditioner installation and replacements
  • Ductless AC

We’ll fix motor fans, condenser coils, refrigerant tanks, air filters, and air ducts for optimal service every time you use the air conditioner.

A male HVAC technician repairing an indoor air conditioner.


We also specialize in professional heating services. Like our cooling services, we have the training and techniques to repair, maintain, and replace your furnace or boiler system fast! We have the skills to handle

We fix pilot lights, motor fans, check wiring connections, and replace thermostats for ultimate heating expertise. No matter what, we’ll make sure you stay warm all year!

Indoor Air Quality

While it may not seem as important as your heating and cooling, at Allied Air Conditioning and Heating, we do our best to ensure clean, purified air throughout your home. Our technicians install

  • UV lights,
  • Air purifiers,
  • Humidifiers and dehumidifiers

Indoor air quality products remove harmful pollutants and contaminants giving you the peace of mind you deserve to breathe easier at home.

Why Us?

We prioritize top-notch customer service for each project from start to finish. Whether you need annual maintenance inspections or a complete in-house replacement to prepare for changing seasons, we do it all. We want everyone to feel safe and secure at home with a working HVAC system all year.

With Allied Air Conditioning & Heating, you can expect

  • Upfront, fair pricing on all services
  • Skilled, professional HVAC technicians using appropriate language and behavior
  • Reliability and friendliness
  • Modern cost-efficient and energy-efficient heating and AC units
  • 100% satisfaction guaranteed

We have over 55 years of industry experience across Lake Forest and surrounding areas. Don’t just take our word for it. Our customers highly recommend us! Check out our countless 5-star reviews to see for yourself!

Contact Us for Expert HVAC in Lake Forest!

Call today at 847-367-8989 or contact us online for a free quote on your system replacement! We’re always available to answer your questions or concerns. You can also contact us today for financing information!

No matter what, we provide reliable heating and air conditioning services in Lake Forest, IL, whenever you need them.


Interested in a boiler for your home or commercial space? Allied Air Conditioning & Heating Corporation partners with IBC and Carrier brands to not only ensure the right fit for any demand but outstanding reliability and lasting performance.


Through our relationship with Wells Fargo Bank, N.A., participating HVAC dealers offer a variety of flexible options for financing your new HVAC product or system. That way, you can invest in your home’s comfort without breaking your monthly budget.

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