Business Details
40 Years
experience
Emergency
services
Expert HVAC Services in Crystal Lake, IL
Official Heating & Cooling has been a trusted provider of HVAC solutions since 1986, serving Crystal Lake and Northern Illinois. Our journey began as Official Heating & Cooling, evolving through strategic acquisitions of ACME Heating, Biewer Heating & Air Conditioning Co., and Active Air Plus to expand our expertise and service area. Recognized by Chicago Magazine as a top HVAC company, we combine decades of experience with cutting-edge technology to deliver superior comfort solutions. As an Armstrong Air Factory Authorized Dealer and NATE-certified technicians, we uphold the highest industry standards for installation, repair, and maintenance.Our commitment to old-school values like honesty and integrity, paired with modern innovations like 24/7 online scheduling and smart home integration, ensures unmatched customer satisfaction. We specialize in residential and commercial HVAC systems, including furnaces, heat pumps, mini-splits, and air quality solutions, backed by industry-leading warranties. Our Rock*Star Maintenance Programs offer cost-saving benefits, while our emergency services provide peace of mind. With a focus on education, sustainability, and community, we strive to make every home and business smarter, healthier, and more efficient.
Services
HVAC Installation
AC Repair
Furnace Maintenance
Duct Cleaning
Water Heater Services
Commercial HVAC
Mini-Split Systems
Heat Pump Repair
Air Quality Solutions
Emergency Services
Details
- Year established: 1986
Highlights and features
- NATE-certified technicians with 35+ years of combined industry experience
- 24/7 emergency HVAC services with upfront pricing
- Factory-authorized Armstrong Air installations and warranties
- Custom Rock*Star Maintenance Plans eliminate emergency fees
- Serving 5+ counties across Northern Illinois with local expertise
Associations and certifications
- NATE (North American Technician Excellence)
- Armstrong Air Factory Authorized Dealer
Services
HVAC Installation
We provide expert installation of furnaces, heat pumps, and air conditioning systems for residential and commercial properties. Our NATE-certified technicians ensure proper sizing and energy-efficient operation. Serving Northern Illinois with Armstrong Air factory-authorized equipment and comprehensive warranties.
AC Repair
Emergency and routine AC repairs for all brands, including diagnostics, refrigerant recharge, and component replacement. Available 24/7 with upfront pricing. Serving Crystal Lake and surrounding areas with same-day service options.
Furnace Maintenance
Preventative maintenance plans to extend system lifespan and improve efficiency. Includes multi-point inspections, cleaning, and safety checks. Rock*Star Program members receive priority service and discounted repairs.
Commercial HVAC
Custom solutions for commercial spaces including rooftop unit maintenance, boiler services, and emergency repairs. Specializing in office, retail, warehouse, and medical facilities across McHenry County with 24/7 support.
Air Quality Solutions
Improve home health with duct cleaning, humidifiers, and ventilation systems. We offer IAQ assessments and installations to reduce allergens and enhance comfort for Crystal Lake residents.
Questions
What HVAC services do you offer?
We provide installation, repair, and maintenance for heating, cooling, and air quality systems including furnaces, AC units, heat pumps, and commercial HVAC equipment.
Do you offer emergency HVAC service?
Yes, we provide 24/7 emergency repairs with upfront pricing. Additional fees may apply for weekend or after-hours service.
Are financing options available?
Yes, we offer HVAC financing plans to make system replacements and major repairs more affordable for homeowners and businesses.
What areas do you service?
We serve Crystal Lake, McHenry County, and surrounding Northern Illinois areas including Cook, DuPage, Kane, and Lake Counties.
Are your technicians certified?
All technicians are NATE-certified with Armstrong Air factory training, ensuring expertise in the latest HVAC technologies and installation methods.
Reviews (2)
Nancy Abzug
Apr 22, 2018
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Eddie the gentleman that came out to check that all was ok was very helpful in explaining and helping with our thermostat. He did a great job.
Denise Sell
Apr 14, 2018
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Great company! Straight forward pricing, no surprises. Installers were great, cleaned everything up and explained everything before they left. Eddie came out to follow up and couldn't have been nicer! Highly recommend this company!
