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Hand It Off To Althoff

Family-owned. Award-winning. True 24-hour service. An unbeatable satisfaction guarantee. We offer whole-home solutions, not just quick fixes.

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What Are Other Chicagoans Saying?

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Gerald Budzik, Yesterday

This was a routine maintenance call for our AC. The service tech, Justin, was excellent. He was prompt, courteous, friendly, neat and efficient. We could...

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Steve Verseman, This week

Jim, Althoff's technician, was great to work with. He explained what was wrong and how it would be repaired. Jim was efficient and courteous.

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Gloria Jenson, This week

They always come on time, call when they are 15 minutes away. Always clean up when done!

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Your Local HVAC Experts in Crystal Lake, IL

Althoff Industries Inc. is a household name that homeowners associate with quality services, friendly technicians, and work that's always done the way it should be. Trust needs to be earned, and we take that to heart on every service we provide. Here are a few reasons why our team should always be the one to call:

  • Family-owned since 1961
  • 24-hour emergency service
  • We provide quotes before performing service
  • 100% satisfaction guarantee

Althoff Industries Inc. is a premier HVAC contractor in Crystal Lake, IL that mixes high-quality service with excellent customer care. We focus on providing homeowners solutions—not just quick fixes. Take advantage of our 100% customer satisfaction guarantee and give us a call today!

Don’t panic, just Hand It Off to Althoff!

About Us

Protect Your Investment with an Althoff Membership

Preventative maintenance saves Money, gives you a Peace of Mind, and offers Priority Service All Year Long. We offer three Membership Service Plans—Silver, Silver+ and our new Plumbing plan—to fit your needs, equipment and budget.

  • Priority Service All year
  • Two scheduled maintenance visits per year
  • Small monthly fee
  • Equipment Purchase Credit
  • No Overtime Repair Charges
  • Discount on HVAC, plumbing, and electrical repairs

Process for a Service

  1. Schedule the Service
  2. We’ll Call You on the Way
  3. We Begin with a Thorough Evaluation
  4. Prices Are Quoted Upfront
  5. Get Same Day Service
  6. Walk Through of Work Performed
  7. Let Us Know How We Did

Call us 24/7

Schedule Service

After we get some info from you, we’ll set up a time to discuss your project in further detail.

Our 100% Satisfaction Guaranteed Services

Air Conditioning

With wild temperature swings and heatwaves becoming a regular phenomenon, proper air conditioning services are a necessity. Regardless of whether you’d like a new central AC installation, repairs performed on your heat pump, or you’d like to explore replacing your old air conditioner with ductless technology, our team can help. Explore your options and additional ways to save with the help of our licensed HVAC professionals. Read More


Things get cold in the Windy City and surrounding areas. Fight back against frigid temperatures with quality heating systems like high-efficiency furnaces, boilers, radiant heating systems, and ductless heat pumps. With our 100% satisfaction guarantee, there’s no risk going into business with us, and we’ll always leave you ready for the winter ahead. Stay cozy, comfortable, and content with the help of Althoff Industries Inc. in Crystal Lake. Read More

Indoor Air Quality

Temperatures aren’t the only thing you should be focused on in regards to your home comfort. Air quality is becoming a huge component of comfortable homes in Crystal Lake, IL, and this includes keeping things clear and safe. From air purifiers that can eliminate harmful germs, to air filtration systems built to catch dust and debris, the team at Althoff Industries Inc. can help your air remain clean and easy to breathe. Read More


Electrical systems are the backbones of our homes. With the increased usage of devices like phones, tablets, and televisions, our homes need to be well-equipped to deal with the increase in power needs. That’s why we supply homes in Chicagoland with state-of-the-art electrical panel work, as well as carbon monoxide and smoke detector service and the installation of attic fans. Contact us to learn more about the electrical services we offer in Crystal Lake. Read More


Here at Althoff Industries Inc., we take a whole-home approach towards drain and pipe services—which means providing you with affordable and effective plumbing solutions. From drain and sewer cleaning services, to video pipe inspection, trenchless pipe replacement, to even the installation of a new water heater, our Crystal Lake plumbers have your back. Call us today and take advantage of our 100% satisfaction guarantee. Read More


Maintenance is the key to success in Crystal Lake, IL. Your heating, cooling, plumbing, electrical, and indoor air quality systems all need to be kept working in prime condition. With the help of our trained professionals, we can provide yearly maintenance on all the comfort systems in your home. We’ll let you know of any repair needs early, make adjustments that improve efficiency, and grant you access to excellent opportunities to save. Read More

Referral Program

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